git.sesse.net Git - ffmpeg/blob - avconv.c

   1 /*
   2  * avconv main
   3  * Copyright (c) 2000-2011 The libav developers.
   4  *
   5  * This file is part of Libav.
   6  *
   7  * Libav is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * Libav is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with Libav; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #include "config.h"
  23 #include <ctype.h>
  24 #include <string.h>
  25 #include <math.h>
  26 #include <stdlib.h>
  27 #include <errno.h>
  28 #include <signal.h>
  29 #include <limits.h>
  30 #include "libavformat/avformat.h"
  31 #include "libavdevice/avdevice.h"
  32 #include "libswscale/swscale.h"
  33 #include "libavresample/avresample.h"
  34 #include "libavutil/opt.h"
  35 #include "libavutil/audioconvert.h"
  36 #include "libavutil/parseutils.h"
  37 #include "libavutil/samplefmt.h"
  38 #include "libavutil/colorspace.h"
  39 #include "libavutil/fifo.h"
  40 #include "libavutil/intreadwrite.h"
  41 #include "libavutil/dict.h"
  42 #include "libavutil/mathematics.h"
  43 #include "libavutil/pixdesc.h"
  44 #include "libavutil/avstring.h"
  45 #include "libavutil/libm.h"
  46 #include "libavutil/imgutils.h"
  47 #include "libavutil/time.h"
  48 #include "libavformat/os_support.h"
  49
  50 # include "libavfilter/avfilter.h"
  51 # include "libavfilter/avfiltergraph.h"
  52 # include "libavfilter/buffersrc.h"
  53 # include "libavfilter/buffersink.h"
  54
  55 #if HAVE_SYS_RESOURCE_H
  56 #include <sys/types.h>
  57 #include <sys/resource.h>
  58 #elif HAVE_GETPROCESSTIMES
  59 #include <windows.h>
  60 #endif
  61 #if HAVE_GETPROCESSMEMORYINFO
  62 #include <windows.h>
  63 #include <psapi.h>
  64 #endif
  65
  66 #if HAVE_SYS_SELECT_H
  67 #include <sys/select.h>
  68 #endif
  69
  70 #if HAVE_PTHREADS
  71 #include <pthread.h>
  72 #endif
  73
  74 #include <time.h>
  75
  76 #include "avconv.h"
  77 #include "cmdutils.h"
  78
  79 #include "libavutil/avassert.h"
  80
  81 const char program_name[] = "avconv";
  82 const int program_birth_year = 2000;
  83
  84 static FILE *vstats_file;
  85
  86 static int64_t video_size = 0;
  87 static int64_t audio_size = 0;
  88 static int64_t extra_size = 0;
  89 static int nb_frames_dup = 0;
  90 static int nb_frames_drop = 0;
  91
  92
  93
  94 #if HAVE_PTHREADS
  95 /* signal to input threads that they should exit; set by the main thread */
  96 static int transcoding_finished;
  97 #endif
  98
  99 #define DEFAULT_PASS_LOGFILENAME_PREFIX "av2pass"
 100
 101 InputStream **input_streams = NULL;
 102 int        nb_input_streams = 0;
 103 InputFile   **input_files   = NULL;
 104 int        nb_input_files   = 0;
 105
 106 OutputStream **output_streams = NULL;
 107 int         nb_output_streams = 0;
 108 OutputFile   **output_files   = NULL;
 109 int         nb_output_files   = 0;
 110
 111 FilterGraph **filtergraphs;
 112 int        nb_filtergraphs;
 113
 114 static void term_exit(void)
 115 {
 116     av_log(NULL, AV_LOG_QUIET, "");
 117 }
 118
 119 static volatile int received_sigterm = 0;
 120 static volatile int received_nb_signals = 0;
 121
 122 static void
 123 sigterm_handler(int sig)
 124 {
 125     received_sigterm = sig;
 126     received_nb_signals++;
 127     term_exit();
 128 }
 129
 130 static void term_init(void)
 131 {
 132     signal(SIGINT , sigterm_handler); /* Interrupt (ANSI).    */
 133     signal(SIGTERM, sigterm_handler); /* Termination (ANSI).  */
 134 #ifdef SIGXCPU
 135     signal(SIGXCPU, sigterm_handler);
 136 #endif
 137 }
 138
 139 static int decode_interrupt_cb(void *ctx)
 140 {
 141     return received_nb_signals > 1;
 142 }
 143
 144 const AVIOInterruptCB int_cb = { decode_interrupt_cb, NULL };
 145
 146 static void exit_program(void)
 147 {
 148     int i, j;
 149
 150     for (i = 0; i < nb_filtergraphs; i++) {
 151         avfilter_graph_free(&filtergraphs[i]->graph);
 152         for (j = 0; j < filtergraphs[i]->nb_inputs; j++) {
 153             av_freep(&filtergraphs[i]->inputs[j]->name);
 154             av_freep(&filtergraphs[i]->inputs[j]);
 155         }
 156         av_freep(&filtergraphs[i]->inputs);
 157         for (j = 0; j < filtergraphs[i]->nb_outputs; j++) {
 158             av_freep(&filtergraphs[i]->outputs[j]->name);
 159             av_freep(&filtergraphs[i]->outputs[j]);
 160         }
 161         av_freep(&filtergraphs[i]->outputs);
 162         av_freep(&filtergraphs[i]);
 163     }
 164     av_freep(&filtergraphs);
 165
 166     /* close files */
 167     for (i = 0; i < nb_output_files; i++) {
 168         AVFormatContext *s = output_files[i]->ctx;
 169         if (!(s->oformat->flags & AVFMT_NOFILE) && s->pb)
 170             avio_close(s->pb);
 171         avformat_free_context(s);
 172         av_dict_free(&output_files[i]->opts);
 173         av_freep(&output_files[i]);
 174     }
 175     for (i = 0; i < nb_output_streams; i++) {
 176         AVBitStreamFilterContext *bsfc = output_streams[i]->bitstream_filters;
 177         while (bsfc) {
 178             AVBitStreamFilterContext *next = bsfc->next;
 179             av_bitstream_filter_close(bsfc);
 180             bsfc = next;
 181         }
 182         output_streams[i]->bitstream_filters = NULL;
 183         avcodec_free_frame(&output_streams[i]->filtered_frame);
 184
 185         av_freep(&output_streams[i]->forced_keyframes);
 186         av_freep(&output_streams[i]->avfilter);
 187         av_freep(&output_streams[i]->logfile_prefix);
 188         av_freep(&output_streams[i]);
 189     }
 190     for (i = 0; i < nb_input_files; i++) {
 191         avformat_close_input(&input_files[i]->ctx);
 192         av_freep(&input_files[i]);
 193     }
 194     for (i = 0; i < nb_input_streams; i++) {
 195         avcodec_free_frame(&input_streams[i]->decoded_frame);
 196         av_dict_free(&input_streams[i]->opts);
 197         free_buffer_pool(&input_streams[i]->buffer_pool);
 198         av_freep(&input_streams[i]->filters);
 199         av_freep(&input_streams[i]);
 200     }
 201
 202     if (vstats_file)
 203         fclose(vstats_file);
 204     av_free(vstats_filename);
 205
 206     av_freep(&input_streams);
 207     av_freep(&input_files);
 208     av_freep(&output_streams);
 209     av_freep(&output_files);
 210
 211     uninit_opts();
 212
 213     avfilter_uninit();
 214     avformat_network_deinit();
 215
 216     if (received_sigterm) {
 217         av_log(NULL, AV_LOG_INFO, "Received signal %d: terminating.\n",
 218                (int) received_sigterm);
 219         exit (255);
 220     }
 221 }
 222
 223 void assert_avoptions(AVDictionary *m)
 224 {
 225     AVDictionaryEntry *t;
 226     if ((t = av_dict_get(m, "", NULL, AV_DICT_IGNORE_SUFFIX))) {
 227         av_log(NULL, AV_LOG_FATAL, "Option %s not found.\n", t->key);
 228         exit(1);
 229     }
 230 }
 231
 232 static void assert_codec_experimental(AVCodecContext *c, int encoder)
 233 {
 234     const char *codec_string = encoder ? "encoder" : "decoder";
 235     AVCodec *codec;
 236     if (c->codec->capabilities & CODEC_CAP_EXPERIMENTAL &&
 237         c->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
 238         av_log(NULL, AV_LOG_FATAL, "%s '%s' is experimental and might produce bad "
 239                 "results.\nAdd '-strict experimental' if you want to use it.\n",
 240                 codec_string, c->codec->name);
 241         codec = encoder ? avcodec_find_encoder(c->codec->id) : avcodec_find_decoder(c->codec->id);
 242         if (!(codec->capabilities & CODEC_CAP_EXPERIMENTAL))
 243             av_log(NULL, AV_LOG_FATAL, "Or use the non experimental %s '%s'.\n",
 244                    codec_string, codec->name);
 245         exit(1);
 246     }
 247 }
 248
 249 /**
 250  * Update the requested input sample format based on the output sample format.
 251  * This is currently only used to request float output from decoders which
 252  * support multiple sample formats, one of which is AV_SAMPLE_FMT_FLT.
 253  * Ideally this will be removed in the future when decoders do not do format
 254  * conversion and only output in their native format.
 255  */
 256 static void update_sample_fmt(AVCodecContext *dec, AVCodec *dec_codec,
 257                               AVCodecContext *enc)
 258 {
 259     /* if sample formats match or a decoder sample format has already been
 260        requested, just return */
 261     if (enc->sample_fmt == dec->sample_fmt ||
 262         dec->request_sample_fmt > AV_SAMPLE_FMT_NONE)
 263         return;
 264
 265     /* if decoder supports more than one output format */
 266     if (dec_codec && dec_codec->sample_fmts &&
 267         dec_codec->sample_fmts[0] != AV_SAMPLE_FMT_NONE &&
 268         dec_codec->sample_fmts[1] != AV_SAMPLE_FMT_NONE) {
 269         const enum AVSampleFormat *p;
 270         int min_dec = INT_MAX, min_inc = INT_MAX;
 271         enum AVSampleFormat dec_fmt = AV_SAMPLE_FMT_NONE;
 272         enum AVSampleFormat inc_fmt = AV_SAMPLE_FMT_NONE;
 273
 274         /* find a matching sample format in the encoder */
 275         for (p = dec_codec->sample_fmts; *p != AV_SAMPLE_FMT_NONE; p++) {
 276             if (*p == enc->sample_fmt) {
 277                 dec->request_sample_fmt = *p;
 278                 return;
 279             } else {
 280                 enum AVSampleFormat dfmt = av_get_packed_sample_fmt(*p);
 281                 enum AVSampleFormat efmt = av_get_packed_sample_fmt(enc->sample_fmt);
 282                 int fmt_diff = 32 * abs(dfmt - efmt);
 283                 if (av_sample_fmt_is_planar(*p) !=
 284                     av_sample_fmt_is_planar(enc->sample_fmt))
 285                     fmt_diff++;
 286                 if (dfmt == efmt) {
 287                     min_inc = fmt_diff;
 288                     inc_fmt = *p;
 289                 } else if (dfmt > efmt) {
 290                     if (fmt_diff < min_inc) {
 291                         min_inc = fmt_diff;
 292                         inc_fmt = *p;
 293                     }
 294                 } else {
 295                     if (fmt_diff < min_dec) {
 296                         min_dec = fmt_diff;
 297                         dec_fmt = *p;
 298                     }
 299                 }
 300             }
 301         }
 302
 303         /* if none match, provide the one that matches quality closest */
 304         dec->request_sample_fmt = min_inc != INT_MAX ? inc_fmt : dec_fmt;
 305     }
 306 }
 307
 308 static void write_frame(AVFormatContext *s, AVPacket *pkt, OutputStream *ost)
 309 {
 310     AVBitStreamFilterContext *bsfc = ost->bitstream_filters;
 311     AVCodecContext          *avctx = ost->st->codec;
 312     int ret;
 313
 314     /*
 315      * Audio encoders may split the packets --  #frames in != #packets out.
 316      * But there is no reordering, so we can limit the number of output packets
 317      * by simply dropping them here.
 318      * Counting encoded video frames needs to be done separately because of
 319      * reordering, see do_video_out()
 320      */
 321     if (!(avctx->codec_type == AVMEDIA_TYPE_VIDEO && avctx->codec)) {
 322         if (ost->frame_number >= ost->max_frames) {
 323             av_free_packet(pkt);
 324             return;
 325         }
 326         ost->frame_number++;
 327     }
 328
 329     while (bsfc) {
 330         AVPacket new_pkt = *pkt;
 331         int a = av_bitstream_filter_filter(bsfc, avctx, NULL,
 332                                            &new_pkt.data, &new_pkt.size,
 333                                            pkt->data, pkt->size,
 334                                            pkt->flags & AV_PKT_FLAG_KEY);
 335         if (a > 0) {
 336             av_free_packet(pkt);
 337             new_pkt.destruct = av_destruct_packet;
 338         } else if (a < 0) {
 339             av_log(NULL, AV_LOG_ERROR, "%s failed for stream %d, codec %s",
 340                    bsfc->filter->name, pkt->stream_index,
 341                    avctx->codec ? avctx->codec->name : "copy");
 342             print_error("", a);
 343             if (exit_on_error)
 344                 exit(1);
 345         }
 346         *pkt = new_pkt;
 347
 348         bsfc = bsfc->next;
 349     }
 350
 351     pkt->stream_index = ost->index;
 352     ret = av_interleaved_write_frame(s, pkt);
 353     if (ret < 0) {
 354         print_error("av_interleaved_write_frame()", ret);
 355         exit(1);
 356     }
 357 }
 358
 359 static int check_recording_time(OutputStream *ost)
 360 {
 361     OutputFile *of = output_files[ost->file_index];
 362
 363     if (of->recording_time != INT64_MAX &&
 364         av_compare_ts(ost->sync_opts - ost->first_pts, ost->st->codec->time_base, of->recording_time,
 365                       AV_TIME_BASE_Q) >= 0) {
 366         ost->finished = 1;
 367         return 0;
 368     }
 369     return 1;
 370 }
 371
 372 static void do_audio_out(AVFormatContext *s, OutputStream *ost,
 373                          AVFrame *frame)
 374 {
 375     AVCodecContext *enc = ost->st->codec;
 376     AVPacket pkt;
 377     int got_packet = 0;
 378
 379     av_init_packet(&pkt);
 380     pkt.data = NULL;
 381     pkt.size = 0;
 382
 383     if (!check_recording_time(ost))
 384         return;
 385
 386     if (frame->pts == AV_NOPTS_VALUE || audio_sync_method < 0)
 387         frame->pts = ost->sync_opts;
 388     ost->sync_opts = frame->pts + frame->nb_samples;
 389
 390     if (avcodec_encode_audio2(enc, &pkt, frame, &got_packet) < 0) {
 391         av_log(NULL, AV_LOG_FATAL, "Audio encoding failed\n");
 392         exit(1);
 393     }
 394
 395     if (got_packet) {
 396         if (pkt.pts != AV_NOPTS_VALUE)
 397             pkt.pts      = av_rescale_q(pkt.pts,      enc->time_base, ost->st->time_base);
 398         if (pkt.dts != AV_NOPTS_VALUE)
 399             pkt.dts      = av_rescale_q(pkt.dts,      enc->time_base, ost->st->time_base);
 400         if (pkt.duration > 0)
 401             pkt.duration = av_rescale_q(pkt.duration, enc->time_base, ost->st->time_base);
 402
 403         write_frame(s, &pkt, ost);
 404
 405         audio_size += pkt.size;
 406     }
 407 }
 408
 409 static void pre_process_video_frame(InputStream *ist, AVPicture *picture, void **bufp)
 410 {
 411     AVCodecContext *dec;
 412     AVPicture *picture2;
 413     AVPicture picture_tmp;
 414     uint8_t *buf = 0;
 415
 416     dec = ist->st->codec;
 417
 418     /* deinterlace : must be done before any resize */
 419     if (do_deinterlace) {
 420         int size;
 421
 422         /* create temporary picture */
 423         size = avpicture_get_size(dec->pix_fmt, dec->width, dec->height);
 424         buf  = av_malloc(size);
 425         if (!buf)
 426             return;
 427
 428         picture2 = &picture_tmp;
 429         avpicture_fill(picture2, buf, dec->pix_fmt, dec->width, dec->height);
 430
 431         if (avpicture_deinterlace(picture2, picture,
 432                                  dec->pix_fmt, dec->width, dec->height) < 0) {
 433             /* if error, do not deinterlace */
 434             av_log(NULL, AV_LOG_WARNING, "Deinterlacing failed\n");
 435             av_free(buf);
 436             buf = NULL;
 437             picture2 = picture;
 438         }
 439     } else {
 440         picture2 = picture;
 441     }
 442
 443     if (picture != picture2)
 444         *picture = *picture2;
 445     *bufp = buf;
 446 }
 447
 448 static void do_subtitle_out(AVFormatContext *s,
 449                             OutputStream *ost,
 450                             InputStream *ist,
 451                             AVSubtitle *sub,
 452                             int64_t pts)
 453 {
 454     static uint8_t *subtitle_out = NULL;
 455     int subtitle_out_max_size = 1024 * 1024;
 456     int subtitle_out_size, nb, i;
 457     AVCodecContext *enc;
 458     AVPacket pkt;
 459
 460     if (pts == AV_NOPTS_VALUE) {
 461         av_log(NULL, AV_LOG_ERROR, "Subtitle packets must have a pts\n");
 462         if (exit_on_error)
 463             exit(1);
 464         return;
 465     }
 466
 467     enc = ost->st->codec;
 468
 469     if (!subtitle_out) {
 470         subtitle_out = av_malloc(subtitle_out_max_size);
 471     }
 472
 473     /* Note: DVB subtitle need one packet to draw them and one other
 474        packet to clear them */
 475     /* XXX: signal it in the codec context ? */
 476     if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE)
 477         nb = 2;
 478     else
 479         nb = 1;
 480
 481     for (i = 0; i < nb; i++) {
 482         ost->sync_opts = av_rescale_q(pts, ist->st->time_base, enc->time_base);
 483         if (!check_recording_time(ost))
 484             return;
 485
 486         sub->pts = av_rescale_q(pts, ist->st->time_base, AV_TIME_BASE_Q);
 487         // start_display_time is required to be 0
 488         sub->pts               += av_rescale_q(sub->start_display_time, (AVRational){ 1, 1000 }, AV_TIME_BASE_Q);
 489         sub->end_display_time  -= sub->start_display_time;
 490         sub->start_display_time = 0;
 491         subtitle_out_size = avcodec_encode_subtitle(enc, subtitle_out,
 492                                                     subtitle_out_max_size, sub);
 493         if (subtitle_out_size < 0) {
 494             av_log(NULL, AV_LOG_FATAL, "Subtitle encoding failed\n");
 495             exit(1);
 496         }
 497
 498         av_init_packet(&pkt);
 499         pkt.data = subtitle_out;
 500         pkt.size = subtitle_out_size;
 501         pkt.pts  = av_rescale_q(sub->pts, AV_TIME_BASE_Q, ost->st->time_base);
 502         if (enc->codec_id == AV_CODEC_ID_DVB_SUBTITLE) {
 503             /* XXX: the pts correction is handled here. Maybe handling
 504                it in the codec would be better */
 505             if (i == 0)
 506                 pkt.pts += 90 * sub->start_display_time;
 507             else
 508                 pkt.pts += 90 * sub->end_display_time;
 509         }
 510         write_frame(s, &pkt, ost);
 511     }
 512 }
 513
 514 static void do_video_out(AVFormatContext *s,
 515                          OutputStream *ost,
 516                          AVFrame *in_picture,
 517                          int *frame_size)
 518 {
 519     int ret, format_video_sync;
 520     AVPacket pkt;
 521     AVCodecContext *enc = ost->st->codec;
 522
 523     *frame_size = 0;
 524
 525     format_video_sync = video_sync_method;
 526     if (format_video_sync == VSYNC_AUTO)
 527         format_video_sync = (s->oformat->flags & AVFMT_NOTIMESTAMPS) ? VSYNC_PASSTHROUGH :
 528                             (s->oformat->flags & AVFMT_VARIABLE_FPS) ? VSYNC_VFR : VSYNC_CFR;
 529     if (format_video_sync != VSYNC_PASSTHROUGH &&
 530         ost->frame_number &&
 531         in_picture->pts != AV_NOPTS_VALUE &&
 532         in_picture->pts < ost->sync_opts) {
 533         nb_frames_drop++;
 534         av_log(NULL, AV_LOG_VERBOSE, "*** drop!\n");
 535         return;
 536     }
 537
 538     if (in_picture->pts == AV_NOPTS_VALUE)
 539         in_picture->pts = ost->sync_opts;
 540     ost->sync_opts = in_picture->pts;
 541
 542
 543     if (!ost->frame_number)
 544         ost->first_pts = in_picture->pts;
 545
 546     av_init_packet(&pkt);
 547     pkt.data = NULL;
 548     pkt.size = 0;
 549
 550     if (!check_recording_time(ost) ||
 551         ost->frame_number >= ost->max_frames)
 552         return;
 553
 554     if (s->oformat->flags & AVFMT_RAWPICTURE &&
 555         enc->codec->id == AV_CODEC_ID_RAWVIDEO) {
 556         /* raw pictures are written as AVPicture structure to
 557            avoid any copies. We support temporarily the older
 558            method. */
 559         enc->coded_frame->interlaced_frame = in_picture->interlaced_frame;
 560         enc->coded_frame->top_field_first  = in_picture->top_field_first;
 561         pkt.data   = (uint8_t *)in_picture;
 562         pkt.size   =  sizeof(AVPicture);
 563         pkt.pts    = av_rescale_q(in_picture->pts, enc->time_base, ost->st->time_base);
 564         pkt.flags |= AV_PKT_FLAG_KEY;
 565
 566         write_frame(s, &pkt, ost);
 567     } else {
 568         int got_packet;
 569         AVFrame big_picture;
 570
 571         big_picture = *in_picture;
 572         /* better than nothing: use input picture interlaced
 573            settings */
 574         big_picture.interlaced_frame = in_picture->interlaced_frame;
 575         if (ost->st->codec->flags & (CODEC_FLAG_INTERLACED_DCT|CODEC_FLAG_INTERLACED_ME)) {
 576             if (ost->top_field_first == -1)
 577                 big_picture.top_field_first = in_picture->top_field_first;
 578             else
 579                 big_picture.top_field_first = !!ost->top_field_first;
 580         }
 581
 582         big_picture.quality = ost->st->codec->global_quality;
 583         if (!enc->me_threshold)
 584             big_picture.pict_type = 0;
 585         if (ost->forced_kf_index < ost->forced_kf_count &&
 586             big_picture.pts >= ost->forced_kf_pts[ost->forced_kf_index]) {
 587             big_picture.pict_type = AV_PICTURE_TYPE_I;
 588             ost->forced_kf_index++;
 589         }
 590         ret = avcodec_encode_video2(enc, &pkt, &big_picture, &got_packet);
 591         if (ret < 0) {
 592             av_log(NULL, AV_LOG_FATAL, "Video encoding failed\n");
 593             exit(1);
 594         }
 595
 596         if (got_packet) {
 597             if (pkt.pts != AV_NOPTS_VALUE)
 598                 pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
 599             if (pkt.dts != AV_NOPTS_VALUE)
 600                 pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
 601
 602             write_frame(s, &pkt, ost);
 603             *frame_size = pkt.size;
 604             video_size += pkt.size;
 605
 606             /* if two pass, output log */
 607             if (ost->logfile && enc->stats_out) {
 608                 fprintf(ost->logfile, "%s", enc->stats_out);
 609             }
 610         }
 611     }
 612     ost->sync_opts++;
 613     /*
 614      * For video, number of frames in == number of packets out.
 615      * But there may be reordering, so we can't throw away frames on encoder
 616      * flush, we need to limit them here, before they go into encoder.
 617      */
 618     ost->frame_number++;
 619 }
 620
 621 static double psnr(double d)
 622 {
 623     return -10.0 * log(d) / log(10.0);
 624 }
 625
 626 static void do_video_stats(AVFormatContext *os, OutputStream *ost,
 627                            int frame_size)
 628 {
 629     AVCodecContext *enc;
 630     int frame_number;
 631     double ti1, bitrate, avg_bitrate;
 632
 633     /* this is executed just the first time do_video_stats is called */
 634     if (!vstats_file) {
 635         vstats_file = fopen(vstats_filename, "w");
 636         if (!vstats_file) {
 637             perror("fopen");
 638             exit(1);
 639         }
 640     }
 641
 642     enc = ost->st->codec;
 643     if (enc->codec_type == AVMEDIA_TYPE_VIDEO) {
 644         frame_number = ost->frame_number;
 645         fprintf(vstats_file, "frame= %5d q= %2.1f ", frame_number, enc->coded_frame->quality / (float)FF_QP2LAMBDA);
 646         if (enc->flags&CODEC_FLAG_PSNR)
 647             fprintf(vstats_file, "PSNR= %6.2f ", psnr(enc->coded_frame->error[0] / (enc->width * enc->height * 255.0 * 255.0)));
 648
 649         fprintf(vstats_file,"f_size= %6d ", frame_size);
 650         /* compute pts value */
 651         ti1 = ost->sync_opts * av_q2d(enc->time_base);
 652         if (ti1 < 0.01)
 653             ti1 = 0.01;
 654
 655         bitrate     = (frame_size * 8) / av_q2d(enc->time_base) / 1000.0;
 656         avg_bitrate = (double)(video_size * 8) / ti1 / 1000.0;
 657         fprintf(vstats_file, "s_size= %8.0fkB time= %0.3f br= %7.1fkbits/s avg_br= %7.1fkbits/s ",
 658                (double)video_size / 1024, ti1, bitrate, avg_bitrate);
 659         fprintf(vstats_file, "type= %c\n", av_get_picture_type_char(enc->coded_frame->pict_type));
 660     }
 661 }
 662
 663 /**
 664  * Read one frame for lavfi output for ost and encode it.
 665  */
 666 static int poll_filter(OutputStream *ost)
 667 {
 668     OutputFile    *of = output_files[ost->file_index];
 669     AVFilterBufferRef *picref;
 670     AVFrame *filtered_frame = NULL;
 671     int frame_size, ret;
 672
 673     if (!ost->filtered_frame && !(ost->filtered_frame = avcodec_alloc_frame())) {
 674         return AVERROR(ENOMEM);
 675     } else
 676         avcodec_get_frame_defaults(ost->filtered_frame);
 677     filtered_frame = ost->filtered_frame;
 678
 679     if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
 680         !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
 681         ret = av_buffersink_read_samples(ost->filter->filter, &picref,
 682                                          ost->st->codec->frame_size);
 683     else
 684         ret = av_buffersink_read(ost->filter->filter, &picref);
 685
 686     if (ret < 0)
 687         return ret;
 688
 689     avfilter_copy_buf_props(filtered_frame, picref);
 690     if (picref->pts != AV_NOPTS_VALUE) {
 691         filtered_frame->pts = av_rescale_q(picref->pts,
 692                                            ost->filter->filter->inputs[0]->time_base,
 693                                            ost->st->codec->time_base) -
 694                               av_rescale_q(of->start_time,
 695                                            AV_TIME_BASE_Q,
 696                                            ost->st->codec->time_base);
 697
 698         if (of->start_time && filtered_frame->pts < 0) {
 699             avfilter_unref_buffer(picref);
 700             return 0;
 701         }
 702     }
 703
 704     switch (ost->filter->filter->inputs[0]->type) {
 705     case AVMEDIA_TYPE_VIDEO:
 706         if (!ost->frame_aspect_ratio)
 707             ost->st->codec->sample_aspect_ratio = picref->video->pixel_aspect;
 708
 709         do_video_out(of->ctx, ost, filtered_frame, &frame_size);
 710         if (vstats_filename && frame_size)
 711             do_video_stats(of->ctx, ost, frame_size);
 712         break;
 713     case AVMEDIA_TYPE_AUDIO:
 714         do_audio_out(of->ctx, ost, filtered_frame);
 715         break;
 716     default:
 717         // TODO support subtitle filters
 718         av_assert0(0);
 719     }
 720
 721     avfilter_unref_buffer(picref);
 722
 723     return 0;
 724 }
 725
 726 /**
 727  * Read as many frames from possible from lavfi and encode them.
 728  *
 729  * Always read from the active stream with the lowest timestamp. If no frames
 730  * are available for it then return EAGAIN and wait for more input. This way we
 731  * can use lavfi sources that generate unlimited amount of frames without memory
 732  * usage exploding.
 733  */
 734 static int poll_filters(void)
 735 {
 736     int i, j, ret = 0;
 737
 738     while (ret >= 0 && !received_sigterm) {
 739         OutputStream *ost = NULL;
 740         int64_t min_pts = INT64_MAX;
 741
 742         /* choose output stream with the lowest timestamp */
 743         for (i = 0; i < nb_output_streams; i++) {
 744             int64_t pts = output_streams[i]->sync_opts;
 745
 746             if (!output_streams[i]->filter || output_streams[i]->finished)
 747                 continue;
 748
 749             pts = av_rescale_q(pts, output_streams[i]->st->codec->time_base,
 750                                AV_TIME_BASE_Q);
 751             if (pts < min_pts) {
 752                 min_pts = pts;
 753                 ost = output_streams[i];
 754             }
 755         }
 756
 757         if (!ost)
 758             break;
 759
 760         ret = poll_filter(ost);
 761
 762         if (ret == AVERROR_EOF) {
 763             OutputFile *of = output_files[ost->file_index];
 764
 765             ost->finished = 1;
 766
 767             if (of->shortest) {
 768                 for (j = 0; j < of->ctx->nb_streams; j++)
 769                     output_streams[of->ost_index + j]->finished = 1;
 770             }
 771
 772             ret = 0;
 773         } else if (ret == AVERROR(EAGAIN))
 774             return 0;
 775     }
 776
 777     return ret;
 778 }
 779
 780 static void print_report(int is_last_report, int64_t timer_start)
 781 {
 782     char buf[1024];
 783     OutputStream *ost;
 784     AVFormatContext *oc;
 785     int64_t total_size;
 786     AVCodecContext *enc;
 787     int frame_number, vid, i;
 788     double bitrate, ti1, pts;
 789     static int64_t last_time = -1;
 790     static int qp_histogram[52];
 791
 792     if (!print_stats && !is_last_report)
 793         return;
 794
 795     if (!is_last_report) {
 796         int64_t cur_time;
 797         /* display the report every 0.5 seconds */
 798         cur_time = av_gettime();
 799         if (last_time == -1) {
 800             last_time = cur_time;
 801             return;
 802         }
 803         if ((cur_time - last_time) < 500000)
 804             return;
 805         last_time = cur_time;
 806     }
 807
 808
 809     oc = output_files[0]->ctx;
 810
 811     total_size = avio_size(oc->pb);
 812     if (total_size < 0) // FIXME improve avio_size() so it works with non seekable output too
 813         total_size = avio_tell(oc->pb);
 814
 815     buf[0] = '\0';
 816     ti1 = 1e10;
 817     vid = 0;
 818     for (i = 0; i < nb_output_streams; i++) {
 819         float q = -1;
 820         ost = output_streams[i];
 821         enc = ost->st->codec;
 822         if (!ost->stream_copy && enc->coded_frame)
 823             q = enc->coded_frame->quality / (float)FF_QP2LAMBDA;
 824         if (vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
 825             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "q=%2.1f ", q);
 826         }
 827         if (!vid && enc->codec_type == AVMEDIA_TYPE_VIDEO) {
 828             float t = (av_gettime() - timer_start) / 1000000.0;
 829
 830             frame_number = ost->frame_number;
 831             snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "frame=%5d fps=%3d q=%3.1f ",
 832                      frame_number, (t > 1) ? (int)(frame_number / t + 0.5) : 0, q);
 833             if (is_last_report)
 834                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "L");
 835             if (qp_hist) {
 836                 int j;
 837                 int qp = lrintf(q);
 838                 if (qp >= 0 && qp < FF_ARRAY_ELEMS(qp_histogram))
 839                     qp_histogram[qp]++;
 840                 for (j = 0; j < 32; j++)
 841                     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%X", (int)lrintf(log2(qp_histogram[j] + 1)));
 842             }
 843             if (enc->flags&CODEC_FLAG_PSNR) {
 844                 int j;
 845                 double error, error_sum = 0;
 846                 double scale, scale_sum = 0;
 847                 char type[3] = { 'Y','U','V' };
 848                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "PSNR=");
 849                 for (j = 0; j < 3; j++) {
 850                     if (is_last_report) {
 851                         error = enc->error[j];
 852                         scale = enc->width * enc->height * 255.0 * 255.0 * frame_number;
 853                     } else {
 854                         error = enc->coded_frame->error[j];
 855                         scale = enc->width * enc->height * 255.0 * 255.0;
 856                     }
 857                     if (j)
 858                         scale /= 4;
 859                     error_sum += error;
 860                     scale_sum += scale;
 861                     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "%c:%2.2f ", type[j], psnr(error / scale));
 862                 }
 863                 snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), "*:%2.2f ", psnr(error_sum / scale_sum));
 864             }
 865             vid = 1;
 866         }
 867         /* compute min output value */
 868         pts = (double)ost->st->pts.val * av_q2d(ost->st->time_base);
 869         if ((pts < ti1) && (pts > 0))
 870             ti1 = pts;
 871     }
 872     if (ti1 < 0.01)
 873         ti1 = 0.01;
 874
 875     bitrate = (double)(total_size * 8) / ti1 / 1000.0;
 876
 877     snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf),
 878             "size=%8.0fkB time=%0.2f bitrate=%6.1fkbits/s",
 879             (double)total_size / 1024, ti1, bitrate);
 880
 881     if (nb_frames_dup || nb_frames_drop)
 882         snprintf(buf + strlen(buf), sizeof(buf) - strlen(buf), " dup=%d drop=%d",
 883                 nb_frames_dup, nb_frames_drop);
 884
 885     av_log(NULL, AV_LOG_INFO, "%s    \r", buf);
 886
 887     fflush(stderr);
 888
 889     if (is_last_report) {
 890         int64_t raw= audio_size + video_size + extra_size;
 891         av_log(NULL, AV_LOG_INFO, "\n");
 892         av_log(NULL, AV_LOG_INFO, "video:%1.0fkB audio:%1.0fkB global headers:%1.0fkB muxing overhead %f%%\n",
 893                video_size / 1024.0,
 894                audio_size / 1024.0,
 895                extra_size / 1024.0,
 896                100.0 * (total_size - raw) / raw
 897         );
 898     }
 899 }
 900
 901 static void flush_encoders(void)
 902 {
 903     int i, ret;
 904
 905     for (i = 0; i < nb_output_streams; i++) {
 906         OutputStream   *ost = output_streams[i];
 907         AVCodecContext *enc = ost->st->codec;
 908         AVFormatContext *os = output_files[ost->file_index]->ctx;
 909         int stop_encoding = 0;
 910
 911         if (!ost->encoding_needed)
 912             continue;
 913
 914         if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO && enc->frame_size <= 1)
 915             continue;
 916         if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO && (os->oformat->flags & AVFMT_RAWPICTURE) && enc->codec->id == AV_CODEC_ID_RAWVIDEO)
 917             continue;
 918
 919         for (;;) {
 920             int (*encode)(AVCodecContext*, AVPacket*, const AVFrame*, int*) = NULL;
 921             const char *desc;
 922             int64_t *size;
 923
 924             switch (ost->st->codec->codec_type) {
 925             case AVMEDIA_TYPE_AUDIO:
 926                 encode = avcodec_encode_audio2;
 927                 desc   = "Audio";
 928                 size   = &audio_size;
 929                 break;
 930             case AVMEDIA_TYPE_VIDEO:
 931                 encode = avcodec_encode_video2;
 932                 desc   = "Video";
 933                 size   = &video_size;
 934                 break;
 935             default:
 936                 stop_encoding = 1;
 937             }
 938
 939             if (encode) {
 940                 AVPacket pkt;
 941                 int got_packet;
 942                 av_init_packet(&pkt);
 943                 pkt.data = NULL;
 944                 pkt.size = 0;
 945
 946                 ret = encode(enc, &pkt, NULL, &got_packet);
 947                 if (ret < 0) {
 948                     av_log(NULL, AV_LOG_FATAL, "%s encoding failed\n", desc);
 949                     exit(1);
 950                 }
 951                 *size += ret;
 952                 if (ost->logfile && enc->stats_out) {
 953                     fprintf(ost->logfile, "%s", enc->stats_out);
 954                 }
 955                 if (!got_packet) {
 956                     stop_encoding = 1;
 957                     break;
 958                 }
 959                 if (pkt.pts != AV_NOPTS_VALUE)
 960                     pkt.pts = av_rescale_q(pkt.pts, enc->time_base, ost->st->time_base);
 961                 if (pkt.dts != AV_NOPTS_VALUE)
 962                     pkt.dts = av_rescale_q(pkt.dts, enc->time_base, ost->st->time_base);
 963                 write_frame(os, &pkt, ost);
 964             }
 965
 966             if (stop_encoding)
 967                 break;
 968         }
 969     }
 970 }
 971
 972 /*
 973  * Check whether a packet from ist should be written into ost at this time
 974  */
 975 static int check_output_constraints(InputStream *ist, OutputStream *ost)
 976 {
 977     OutputFile *of = output_files[ost->file_index];
 978     int ist_index  = input_files[ist->file_index]->ist_index + ist->st->index;
 979
 980     if (ost->source_index != ist_index)
 981         return 0;
 982
 983     if (of->start_time && ist->last_dts < of->start_time)
 984         return 0;
 985
 986     return 1;
 987 }
 988
 989 static void do_streamcopy(InputStream *ist, OutputStream *ost, const AVPacket *pkt)
 990 {
 991     OutputFile *of = output_files[ost->file_index];
 992     int64_t ost_tb_start_time = av_rescale_q(of->start_time, AV_TIME_BASE_Q, ost->st->time_base);
 993     AVPacket opkt;
 994
 995     av_init_packet(&opkt);
 996
 997     if ((!ost->frame_number && !(pkt->flags & AV_PKT_FLAG_KEY)) &&
 998         !ost->copy_initial_nonkeyframes)
 999         return;
1000
1001     if (of->recording_time != INT64_MAX &&
1002         ist->last_dts >= of->recording_time + of->start_time) {
1003         ost->finished = 1;
1004         return;
1005     }
1006
1007     /* force the input stream PTS */
1008     if (ost->st->codec->codec_type == AVMEDIA_TYPE_AUDIO)
1009         audio_size += pkt->size;
1010     else if (ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
1011         video_size += pkt->size;
1012         ost->sync_opts++;
1013     }
1014
1015     if (pkt->pts != AV_NOPTS_VALUE)
1016         opkt.pts = av_rescale_q(pkt->pts, ist->st->time_base, ost->st->time_base) - ost_tb_start_time;
1017     else
1018         opkt.pts = AV_NOPTS_VALUE;
1019
1020     if (pkt->dts == AV_NOPTS_VALUE)
1021         opkt.dts = av_rescale_q(ist->last_dts, AV_TIME_BASE_Q, ost->st->time_base);
1022     else
1023         opkt.dts = av_rescale_q(pkt->dts, ist->st->time_base, ost->st->time_base);
1024     opkt.dts -= ost_tb_start_time;
1025
1026     opkt.duration = av_rescale_q(pkt->duration, ist->st->time_base, ost->st->time_base);
1027     opkt.flags    = pkt->flags;
1028
1029     // FIXME remove the following 2 lines they shall be replaced by the bitstream filters
1030     if (  ost->st->codec->codec_id != AV_CODEC_ID_H264
1031        && ost->st->codec->codec_id != AV_CODEC_ID_MPEG1VIDEO
1032        && ost->st->codec->codec_id != AV_CODEC_ID_MPEG2VIDEO
1033        && ost->st->codec->codec_id != AV_CODEC_ID_VC1
1034        ) {
1035         if (av_parser_change(ist->st->parser, ost->st->codec, &opkt.data, &opkt.size, pkt->data, pkt->size, pkt->flags & AV_PKT_FLAG_KEY))
1036             opkt.destruct = av_destruct_packet;
1037     } else {
1038         opkt.data = pkt->data;
1039         opkt.size = pkt->size;
1040     }
1041
1042     write_frame(of->ctx, &opkt, ost);
1043     ost->st->codec->frame_number++;
1044     av_free_packet(&opkt);
1045 }
1046
1047 static void rate_emu_sleep(InputStream *ist)
1048 {
1049     if (input_files[ist->file_index]->rate_emu) {
1050         int64_t pts = av_rescale(ist->last_dts, 1000000, AV_TIME_BASE);
1051         int64_t now = av_gettime() - ist->start;
1052         if (pts > now)
1053             av_usleep(pts - now);
1054     }
1055 }
1056
1057 int guess_input_channel_layout(InputStream *ist)
1058 {
1059     AVCodecContext *dec = ist->st->codec;
1060
1061     if (!dec->channel_layout) {
1062         char layout_name[256];
1063
1064         dec->channel_layout = av_get_default_channel_layout(dec->channels);
1065         if (!dec->channel_layout)
1066             return 0;
1067         av_get_channel_layout_string(layout_name, sizeof(layout_name),
1068                                      dec->channels, dec->channel_layout);
1069         av_log(NULL, AV_LOG_WARNING, "Guessed Channel Layout for  Input Stream "
1070                "#%d.%d : %s\n", ist->file_index, ist->st->index, layout_name);
1071     }
1072     return 1;
1073 }
1074
1075 static int decode_audio(InputStream *ist, AVPacket *pkt, int *got_output)
1076 {
1077     AVFrame *decoded_frame;
1078     AVCodecContext *avctx = ist->st->codec;
1079     int bps = av_get_bytes_per_sample(ist->st->codec->sample_fmt);
1080     int i, ret, resample_changed;
1081
1082     if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
1083         return AVERROR(ENOMEM);
1084     else
1085         avcodec_get_frame_defaults(ist->decoded_frame);
1086     decoded_frame = ist->decoded_frame;
1087
1088     ret = avcodec_decode_audio4(avctx, decoded_frame, got_output, pkt);
1089     if (!*got_output || ret < 0) {
1090         if (!pkt->size) {
1091             for (i = 0; i < ist->nb_filters; i++)
1092                 av_buffersrc_buffer(ist->filters[i]->filter, NULL);
1093         }
1094         return ret;
1095     }
1096
1097     /* if the decoder provides a pts, use it instead of the last packet pts.
1098        the decoder could be delaying output by a packet or more. */
1099     if (decoded_frame->pts != AV_NOPTS_VALUE)
1100         ist->next_dts = decoded_frame->pts;
1101     else if (pkt->pts != AV_NOPTS_VALUE) {
1102         decoded_frame->pts = pkt->pts;
1103         pkt->pts           = AV_NOPTS_VALUE;
1104     }
1105
1106     // preprocess audio (volume)
1107     if (audio_volume != 256) {
1108         int decoded_data_size = decoded_frame->nb_samples * avctx->channels * bps;
1109         void *samples = decoded_frame->data[0];
1110         switch (avctx->sample_fmt) {
1111         case AV_SAMPLE_FMT_U8:
1112         {
1113             uint8_t *volp = samples;
1114             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1115                 int v = (((*volp - 128) * audio_volume + 128) >> 8) + 128;
1116                 *volp++ = av_clip_uint8(v);
1117             }
1118             break;
1119         }
1120         case AV_SAMPLE_FMT_S16:
1121         {
1122             int16_t *volp = samples;
1123             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1124                 int v = ((*volp) * audio_volume + 128) >> 8;
1125                 *volp++ = av_clip_int16(v);
1126             }
1127             break;
1128         }
1129         case AV_SAMPLE_FMT_S32:
1130         {
1131             int32_t *volp = samples;
1132             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1133                 int64_t v = (((int64_t)*volp * audio_volume + 128) >> 8);
1134                 *volp++ = av_clipl_int32(v);
1135             }
1136             break;
1137         }
1138         case AV_SAMPLE_FMT_FLT:
1139         {
1140             float *volp = samples;
1141             float scale = audio_volume / 256.f;
1142             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1143                 *volp++ *= scale;
1144             }
1145             break;
1146         }
1147         case AV_SAMPLE_FMT_DBL:
1148         {
1149             double *volp = samples;
1150             double scale = audio_volume / 256.;
1151             for (i = 0; i < (decoded_data_size / sizeof(*volp)); i++) {
1152                 *volp++ *= scale;
1153             }
1154             break;
1155         }
1156         default:
1157             av_log(NULL, AV_LOG_FATAL,
1158                    "Audio volume adjustment on sample format %s is not supported.\n",
1159                    av_get_sample_fmt_name(ist->st->codec->sample_fmt));
1160             exit(1);
1161         }
1162     }
1163
1164     rate_emu_sleep(ist);
1165
1166     resample_changed = ist->resample_sample_fmt     != decoded_frame->format         ||
1167                        ist->resample_channels       != avctx->channels               ||
1168                        ist->resample_channel_layout != decoded_frame->channel_layout ||
1169                        ist->resample_sample_rate    != decoded_frame->sample_rate;
1170     if (resample_changed) {
1171         char layout1[64], layout2[64];
1172
1173         if (!guess_input_channel_layout(ist)) {
1174             av_log(NULL, AV_LOG_FATAL, "Unable to find default channel "
1175                    "layout for Input Stream #%d.%d\n", ist->file_index,
1176                    ist->st->index);
1177             exit(1);
1178         }
1179         decoded_frame->channel_layout = avctx->channel_layout;
1180
1181         av_get_channel_layout_string(layout1, sizeof(layout1), ist->resample_channels,
1182                                      ist->resample_channel_layout);
1183         av_get_channel_layout_string(layout2, sizeof(layout2), avctx->channels,
1184                                      decoded_frame->channel_layout);
1185
1186         av_log(NULL, AV_LOG_INFO,
1187                "Input stream #%d:%d frame changed from rate:%d fmt:%s ch:%d chl:%s to rate:%d fmt:%s ch:%d chl:%s\n",
1188                ist->file_index, ist->st->index,
1189                ist->resample_sample_rate,  av_get_sample_fmt_name(ist->resample_sample_fmt),
1190                ist->resample_channels, layout1,
1191                decoded_frame->sample_rate, av_get_sample_fmt_name(decoded_frame->format),
1192                avctx->channels, layout2);
1193
1194         ist->resample_sample_fmt     = decoded_frame->format;
1195         ist->resample_sample_rate    = decoded_frame->sample_rate;
1196         ist->resample_channel_layout = decoded_frame->channel_layout;
1197         ist->resample_channels       = avctx->channels;
1198
1199         for (i = 0; i < nb_filtergraphs; i++)
1200             if (ist_in_filtergraph(filtergraphs[i], ist) &&
1201                 configure_filtergraph(filtergraphs[i]) < 0) {
1202                 av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
1203                 exit(1);
1204             }
1205     }
1206
1207     if (decoded_frame->pts != AV_NOPTS_VALUE)
1208         decoded_frame->pts = av_rescale_q(decoded_frame->pts,
1209                                           ist->st->time_base,
1210                                           (AVRational){1, ist->st->codec->sample_rate});
1211     for (i = 0; i < ist->nb_filters; i++)
1212         av_buffersrc_write_frame(ist->filters[i]->filter, decoded_frame);
1213
1214     return ret;
1215 }
1216
1217 static int decode_video(InputStream *ist, AVPacket *pkt, int *got_output)
1218 {
1219     AVFrame *decoded_frame;
1220     void *buffer_to_free = NULL;
1221     int i, ret = 0, resample_changed;
1222
1223     if (!ist->decoded_frame && !(ist->decoded_frame = avcodec_alloc_frame()))
1224         return AVERROR(ENOMEM);
1225     else
1226         avcodec_get_frame_defaults(ist->decoded_frame);
1227     decoded_frame = ist->decoded_frame;
1228
1229     ret = avcodec_decode_video2(ist->st->codec,
1230                                 decoded_frame, got_output, pkt);
1231     if (!*got_output || ret < 0) {
1232         if (!pkt->size) {
1233             for (i = 0; i < ist->nb_filters; i++)
1234                 av_buffersrc_buffer(ist->filters[i]->filter, NULL);
1235         }
1236         return ret;
1237     }
1238
1239     decoded_frame->pts = guess_correct_pts(&ist->pts_ctx, decoded_frame->pkt_pts,
1240                                            decoded_frame->pkt_dts);
1241     pkt->size = 0;
1242     pre_process_video_frame(ist, (AVPicture *)decoded_frame, &buffer_to_free);
1243
1244     rate_emu_sleep(ist);
1245
1246     if (ist->st->sample_aspect_ratio.num)
1247         decoded_frame->sample_aspect_ratio = ist->st->sample_aspect_ratio;
1248
1249     resample_changed = ist->resample_width   != decoded_frame->width  ||
1250                        ist->resample_height  != decoded_frame->height ||
1251                        ist->resample_pix_fmt != decoded_frame->format;
1252     if (resample_changed) {
1253         av_log(NULL, AV_LOG_INFO,
1254                "Input stream #%d:%d frame changed from size:%dx%d fmt:%s to size:%dx%d fmt:%s\n",
1255                ist->file_index, ist->st->index,
1256                ist->resample_width,  ist->resample_height,  av_get_pix_fmt_name(ist->resample_pix_fmt),
1257                decoded_frame->width, decoded_frame->height, av_get_pix_fmt_name(decoded_frame->format));
1258
1259         ret = poll_filters();
1260         if (ret < 0 && (ret != AVERROR_EOF && ret != AVERROR(EAGAIN)))
1261             av_log(NULL, AV_LOG_ERROR, "Error while filtering.\n");
1262
1263         ist->resample_width   = decoded_frame->width;
1264         ist->resample_height  = decoded_frame->height;
1265         ist->resample_pix_fmt = decoded_frame->format;
1266
1267         for (i = 0; i < nb_filtergraphs; i++)
1268             if (ist_in_filtergraph(filtergraphs[i], ist) &&
1269                 configure_filtergraph(filtergraphs[i]) < 0) {
1270                 av_log(NULL, AV_LOG_FATAL, "Error reinitializing filters!\n");
1271                 exit(1);
1272             }
1273     }
1274
1275     for (i = 0; i < ist->nb_filters; i++) {
1276         if (ist->st->codec->codec->capabilities & CODEC_CAP_DR1) {
1277             FrameBuffer      *buf = decoded_frame->opaque;
1278             AVFilterBufferRef *fb = avfilter_get_video_buffer_ref_from_arrays(
1279                                         decoded_frame->data, decoded_frame->linesize,
1280                                         AV_PERM_READ | AV_PERM_PRESERVE,
1281                                         ist->st->codec->width, ist->st->codec->height,
1282                                         ist->st->codec->pix_fmt);
1283
1284             avfilter_copy_frame_props(fb, decoded_frame);
1285             fb->buf->priv           = buf;
1286             fb->buf->free           = filter_release_buffer;
1287
1288             buf->refcount++;
1289             av_buffersrc_buffer(ist->filters[i]->filter, fb);
1290         } else
1291             av_buffersrc_write_frame(ist->filters[i]->filter, decoded_frame);
1292     }
1293
1294     av_free(buffer_to_free);
1295     return ret;
1296 }
1297
1298 static int transcode_subtitles(InputStream *ist, AVPacket *pkt, int *got_output)
1299 {
1300     AVSubtitle subtitle;
1301     int i, ret = avcodec_decode_subtitle2(ist->st->codec,
1302                                           &subtitle, got_output, pkt);
1303     if (ret < 0)
1304         return ret;
1305     if (!*got_output)
1306         return ret;
1307
1308     rate_emu_sleep(ist);
1309
1310     for (i = 0; i < nb_output_streams; i++) {
1311         OutputStream *ost = output_streams[i];
1312
1313         if (!check_output_constraints(ist, ost) || !ost->encoding_needed)
1314             continue;
1315
1316         do_subtitle_out(output_files[ost->file_index]->ctx, ost, ist, &subtitle, pkt->pts);
1317     }
1318
1319     avsubtitle_free(&subtitle);
1320     return ret;
1321 }
1322
1323 /* pkt = NULL means EOF (needed to flush decoder buffers) */
1324 static int output_packet(InputStream *ist, const AVPacket *pkt)
1325 {
1326     int i;
1327     int got_output;
1328     AVPacket avpkt;
1329
1330     if (ist->next_dts == AV_NOPTS_VALUE)
1331         ist->next_dts = ist->last_dts;
1332
1333     if (pkt == NULL) {
1334         /* EOF handling */
1335         av_init_packet(&avpkt);
1336         avpkt.data = NULL;
1337         avpkt.size = 0;
1338         goto handle_eof;
1339     } else {
1340         avpkt = *pkt;
1341     }
1342
1343     if (pkt->dts != AV_NOPTS_VALUE)
1344         ist->next_dts = ist->last_dts = av_rescale_q(pkt->dts, ist->st->time_base, AV_TIME_BASE_Q);
1345
1346     // while we have more to decode or while the decoder did output something on EOF
1347     while (ist->decoding_needed && (avpkt.size > 0 || (!pkt && got_output))) {
1348         int ret = 0;
1349     handle_eof:
1350
1351         ist->last_dts = ist->next_dts;
1352
1353         if (avpkt.size && avpkt.size != pkt->size) {
1354             av_log(NULL, ist->showed_multi_packet_warning ? AV_LOG_VERBOSE : AV_LOG_WARNING,
1355                    "Multiple frames in a packet from stream %d\n", pkt->stream_index);
1356             ist->showed_multi_packet_warning = 1;
1357         }
1358
1359         switch (ist->st->codec->codec_type) {
1360         case AVMEDIA_TYPE_AUDIO:
1361             ret = decode_audio    (ist, &avpkt, &got_output);
1362             break;
1363         case AVMEDIA_TYPE_VIDEO:
1364             ret = decode_video    (ist, &avpkt, &got_output);
1365             if (avpkt.duration)
1366                 ist->next_dts += av_rescale_q(avpkt.duration, ist->st->time_base, AV_TIME_BASE_Q);
1367             else if (ist->st->avg_frame_rate.num)
1368                 ist->next_dts += av_rescale_q(1, av_inv_q(ist->st->avg_frame_rate),
1369                                               AV_TIME_BASE_Q);
1370             else if (ist->st->codec->time_base.num != 0) {
1371                 int ticks      = ist->st->parser ? ist->st->parser->repeat_pict + 1 :
1372                                                    ist->st->codec->ticks_per_frame;
1373                 ist->next_dts += av_rescale_q(ticks, ist->st->codec->time_base, AV_TIME_BASE_Q);
1374             }
1375             break;
1376         case AVMEDIA_TYPE_SUBTITLE:
1377             ret = transcode_subtitles(ist, &avpkt, &got_output);
1378             break;
1379         default:
1380             return -1;
1381         }
1382
1383         if (ret < 0)
1384             return ret;
1385         // touch data and size only if not EOF
1386         if (pkt) {
1387             avpkt.data += ret;
1388             avpkt.size -= ret;
1389         }
1390         if (!got_output) {
1391             continue;
1392         }
1393     }
1394
1395     /* handle stream copy */
1396     if (!ist->decoding_needed) {
1397         rate_emu_sleep(ist);
1398         ist->last_dts = ist->next_dts;
1399         switch (ist->st->codec->codec_type) {
1400         case AVMEDIA_TYPE_AUDIO:
1401             ist->next_dts += ((int64_t)AV_TIME_BASE * ist->st->codec->frame_size) /
1402                              ist->st->codec->sample_rate;
1403             break;
1404         case AVMEDIA_TYPE_VIDEO:
1405             if (ist->st->codec->time_base.num != 0) {
1406                 int ticks = ist->st->parser ? ist->st->parser->repeat_pict + 1 : ist->st->codec->ticks_per_frame;
1407                 ist->next_dts += ((int64_t)AV_TIME_BASE *
1408                                   ist->st->codec->time_base.num * ticks) /
1409                                   ist->st->codec->time_base.den;
1410             }
1411             break;
1412         }
1413     }
1414     for (i = 0; pkt && i < nb_output_streams; i++) {
1415         OutputStream *ost = output_streams[i];
1416
1417         if (!check_output_constraints(ist, ost) || ost->encoding_needed)
1418             continue;
1419
1420         do_streamcopy(ist, ost, pkt);
1421     }
1422
1423     return 0;
1424 }
1425
1426 static void print_sdp(void)
1427 {
1428     char sdp[2048];
1429     int i;
1430     AVFormatContext **avc = av_malloc(sizeof(*avc) * nb_output_files);
1431
1432     if (!avc)
1433         exit(1);
1434     for (i = 0; i < nb_output_files; i++)
1435         avc[i] = output_files[i]->ctx;
1436
1437     av_sdp_create(avc, nb_output_files, sdp, sizeof(sdp));
1438     printf("SDP:\n%s\n", sdp);
1439     fflush(stdout);
1440     av_freep(&avc);
1441 }
1442
1443 static int init_input_stream(int ist_index, char *error, int error_len)
1444 {
1445     int i;
1446     InputStream *ist = input_streams[ist_index];
1447     if (ist->decoding_needed) {
1448         AVCodec *codec = ist->dec;
1449         if (!codec) {
1450             snprintf(error, error_len, "Decoder (codec id %d) not found for input stream #%d:%d",
1451                     ist->st->codec->codec_id, ist->file_index, ist->st->index);
1452             return AVERROR(EINVAL);
1453         }
1454
1455         /* update requested sample format for the decoder based on the
1456            corresponding encoder sample format */
1457         for (i = 0; i < nb_output_streams; i++) {
1458             OutputStream *ost = output_streams[i];
1459             if (ost->source_index == ist_index) {
1460                 update_sample_fmt(ist->st->codec, codec, ost->st->codec);
1461                 break;
1462             }
1463         }
1464
1465         if (codec->type == AVMEDIA_TYPE_VIDEO && codec->capabilities & CODEC_CAP_DR1) {
1466             ist->st->codec->get_buffer     = codec_get_buffer;
1467             ist->st->codec->release_buffer = codec_release_buffer;
1468             ist->st->codec->opaque         = &ist->buffer_pool;
1469         }
1470
1471         if (!av_dict_get(ist->opts, "threads", NULL, 0))
1472             av_dict_set(&ist->opts, "threads", "auto", 0);
1473         if (avcodec_open2(ist->st->codec, codec, &ist->opts) < 0) {
1474             snprintf(error, error_len, "Error while opening decoder for input stream #%d:%d",
1475                     ist->file_index, ist->st->index);
1476             return AVERROR(EINVAL);
1477         }
1478         assert_codec_experimental(ist->st->codec, 0);
1479         assert_avoptions(ist->opts);
1480     }
1481
1482     ist->last_dts = ist->st->avg_frame_rate.num ? - ist->st->codec->has_b_frames * AV_TIME_BASE / av_q2d(ist->st->avg_frame_rate) : 0;
1483     ist->next_dts = AV_NOPTS_VALUE;
1484     init_pts_correction(&ist->pts_ctx);
1485     ist->is_start = 1;
1486
1487     return 0;
1488 }
1489
1490 static InputStream *get_input_stream(OutputStream *ost)
1491 {
1492     if (ost->source_index >= 0)
1493         return input_streams[ost->source_index];
1494
1495     if (ost->filter) {
1496         FilterGraph *fg = ost->filter->graph;
1497         int i;
1498
1499         for (i = 0; i < fg->nb_inputs; i++)
1500             if (fg->inputs[i]->ist->st->codec->codec_type == ost->st->codec->codec_type)
1501                 return fg->inputs[i]->ist;
1502     }
1503
1504     return NULL;
1505 }
1506
1507 static void parse_forced_key_frames(char *kf, OutputStream *ost,
1508                                     AVCodecContext *avctx)
1509 {
1510     char *p;
1511     int n = 1, i;
1512     int64_t t;
1513
1514     for (p = kf; *p; p++)
1515         if (*p == ',')
1516             n++;
1517     ost->forced_kf_count = n;
1518     ost->forced_kf_pts   = av_malloc(sizeof(*ost->forced_kf_pts) * n);
1519     if (!ost->forced_kf_pts) {
1520         av_log(NULL, AV_LOG_FATAL, "Could not allocate forced key frames array.\n");
1521         exit(1);
1522     }
1523
1524     p = kf;
1525     for (i = 0; i < n; i++) {
1526         char *next = strchr(p, ',');
1527
1528         if (next)
1529             *next++ = 0;
1530
1531         t = parse_time_or_die("force_key_frames", p, 1);
1532         ost->forced_kf_pts[i] = av_rescale_q(t, AV_TIME_BASE_Q, avctx->time_base);
1533
1534         p = next;
1535     }
1536 }
1537
1538 static int transcode_init(void)
1539 {
1540     int ret = 0, i, j, k;
1541     AVFormatContext *oc;
1542     AVCodecContext *codec;
1543     OutputStream *ost;
1544     InputStream *ist;
1545     char error[1024];
1546     int want_sdp = 1;
1547
1548     /* init framerate emulation */
1549     for (i = 0; i < nb_input_files; i++) {
1550         InputFile *ifile = input_files[i];
1551         if (ifile->rate_emu)
1552             for (j = 0; j < ifile->nb_streams; j++)
1553                 input_streams[j + ifile->ist_index]->start = av_gettime();
1554     }
1555
1556     /* output stream init */
1557     for (i = 0; i < nb_output_files; i++) {
1558         oc = output_files[i]->ctx;
1559         if (!oc->nb_streams && !(oc->oformat->flags & AVFMT_NOSTREAMS)) {
1560             av_dump_format(oc, i, oc->filename, 1);
1561             av_log(NULL, AV_LOG_ERROR, "Output file #%d does not contain any stream\n", i);
1562             return AVERROR(EINVAL);
1563         }
1564     }
1565
1566     /* init complex filtergraphs */
1567     for (i = 0; i < nb_filtergraphs; i++)
1568         if ((ret = avfilter_graph_config(filtergraphs[i]->graph, NULL)) < 0)
1569             return ret;
1570
1571     /* for each output stream, we compute the right encoding parameters */
1572     for (i = 0; i < nb_output_streams; i++) {
1573         AVCodecContext *icodec = NULL;
1574         ost = output_streams[i];
1575         oc  = output_files[ost->file_index]->ctx;
1576         ist = get_input_stream(ost);
1577
1578         if (ost->attachment_filename)
1579             continue;
1580
1581         codec  = ost->st->codec;
1582
1583         if (ist) {
1584             icodec = ist->st->codec;
1585
1586             ost->st->disposition          = ist->st->disposition;
1587             codec->bits_per_raw_sample    = icodec->bits_per_raw_sample;
1588             codec->chroma_sample_location = icodec->chroma_sample_location;
1589         }
1590
1591         if (ost->stream_copy) {
1592             uint64_t extra_size;
1593
1594             av_assert0(ist && !ost->filter);
1595
1596             extra_size = (uint64_t)icodec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE;
1597
1598             if (extra_size > INT_MAX) {
1599                 return AVERROR(EINVAL);
1600             }
1601
1602             /* if stream_copy is selected, no need to decode or encode */
1603             codec->codec_id   = icodec->codec_id;
1604             codec->codec_type = icodec->codec_type;
1605
1606             if (!codec->codec_tag) {
1607                 if (!oc->oformat->codec_tag ||
1608                      av_codec_get_id (oc->oformat->codec_tag, icodec->codec_tag) == codec->codec_id ||
1609                      av_codec_get_tag(oc->oformat->codec_tag, icodec->codec_id) <= 0)
1610                     codec->codec_tag = icodec->codec_tag;
1611             }
1612
1613             codec->bit_rate       = icodec->bit_rate;
1614             codec->rc_max_rate    = icodec->rc_max_rate;
1615             codec->rc_buffer_size = icodec->rc_buffer_size;
1616             codec->field_order    = icodec->field_order;
1617             codec->extradata      = av_mallocz(extra_size);
1618             if (!codec->extradata) {
1619                 return AVERROR(ENOMEM);
1620             }
1621             memcpy(codec->extradata, icodec->extradata, icodec->extradata_size);
1622             codec->extradata_size = icodec->extradata_size;
1623             if (!copy_tb) {
1624                 codec->time_base      = icodec->time_base;
1625                 codec->time_base.num *= icodec->ticks_per_frame;
1626                 av_reduce(&codec->time_base.num, &codec->time_base.den,
1627                           codec->time_base.num, codec->time_base.den, INT_MAX);
1628             } else
1629                 codec->time_base = ist->st->time_base;
1630
1631             switch (codec->codec_type) {
1632             case AVMEDIA_TYPE_AUDIO:
1633                 if (audio_volume != 256) {
1634                     av_log(NULL, AV_LOG_FATAL, "-acodec copy and -vol are incompatible (frames are not decoded)\n");
1635                     exit(1);
1636                 }
1637                 codec->channel_layout     = icodec->channel_layout;
1638                 codec->sample_rate        = icodec->sample_rate;
1639                 codec->channels           = icodec->channels;
1640                 codec->frame_size         = icodec->frame_size;
1641                 codec->audio_service_type = icodec->audio_service_type;
1642                 codec->block_align        = icodec->block_align;
1643                 break;
1644             case AVMEDIA_TYPE_VIDEO:
1645                 codec->pix_fmt            = icodec->pix_fmt;
1646                 codec->width              = icodec->width;
1647                 codec->height             = icodec->height;
1648                 codec->has_b_frames       = icodec->has_b_frames;
1649                 if (!codec->sample_aspect_ratio.num) {
1650                     codec->sample_aspect_ratio   =
1651                     ost->st->sample_aspect_ratio =
1652                         ist->st->sample_aspect_ratio.num ? ist->st->sample_aspect_ratio :
1653                         ist->st->codec->sample_aspect_ratio.num ?
1654                         ist->st->codec->sample_aspect_ratio : (AVRational){0, 1};
1655                 }
1656                 break;
1657             case AVMEDIA_TYPE_SUBTITLE:
1658                 codec->width  = icodec->width;
1659                 codec->height = icodec->height;
1660                 break;
1661             case AVMEDIA_TYPE_DATA:
1662             case AVMEDIA_TYPE_ATTACHMENT:
1663                 break;
1664             default:
1665                 abort();
1666             }
1667         } else {
1668             if (!ost->enc) {
1669                 /* should only happen when a default codec is not present. */
1670                 snprintf(error, sizeof(error), "Automatic encoder selection "
1671                          "failed for output stream #%d:%d. Default encoder for "
1672                          "format %s is probably disabled. Please choose an "
1673                          "encoder manually.\n", ost->file_index, ost->index,
1674                          oc->oformat->name);
1675                 ret = AVERROR(EINVAL);
1676                 goto dump_format;
1677             }
1678
1679             if (ist)
1680                 ist->decoding_needed = 1;
1681             ost->encoding_needed = 1;
1682
1683             /*
1684              * We want CFR output if and only if one of those is true:
1685              * 1) user specified output framerate with -r
1686              * 2) user specified -vsync cfr
1687              * 3) output format is CFR and the user didn't force vsync to
1688              *    something else than CFR
1689              *
1690              * in such a case, set ost->frame_rate
1691              */
1692             if (codec->codec_type == AVMEDIA_TYPE_VIDEO &&
1693                 !ost->frame_rate.num && ist &&
1694                 (video_sync_method ==  VSYNC_CFR ||
1695                  (video_sync_method ==  VSYNC_AUTO &&
1696                   !(oc->oformat->flags & (AVFMT_NOTIMESTAMPS | AVFMT_VARIABLE_FPS))))) {
1697                 ost->frame_rate = ist->framerate.num ? ist->framerate :
1698                                   ist->st->avg_frame_rate.num ?
1699                                   ist->st->avg_frame_rate :
1700                                   (AVRational){25, 1};
1701
1702                 if (ost->enc && ost->enc->supported_framerates && !ost->force_fps) {
1703                     int idx = av_find_nearest_q_idx(ost->frame_rate, ost->enc->supported_framerates);
1704                     ost->frame_rate = ost->enc->supported_framerates[idx];
1705                 }
1706             }
1707
1708             if (!ost->filter &&
1709                 (codec->codec_type == AVMEDIA_TYPE_VIDEO ||
1710                  codec->codec_type == AVMEDIA_TYPE_AUDIO)) {
1711                     FilterGraph *fg;
1712                     fg = init_simple_filtergraph(ist, ost);
1713                     if (configure_filtergraph(fg)) {
1714                         av_log(NULL, AV_LOG_FATAL, "Error opening filters!\n");
1715                         exit(1);
1716                     }
1717             }
1718
1719             switch (codec->codec_type) {
1720             case AVMEDIA_TYPE_AUDIO:
1721                 codec->sample_fmt     = ost->filter->filter->inputs[0]->format;
1722                 codec->sample_rate    = ost->filter->filter->inputs[0]->sample_rate;
1723                 codec->channel_layout = ost->filter->filter->inputs[0]->channel_layout;
1724                 codec->channels       = av_get_channel_layout_nb_channels(codec->channel_layout);
1725                 codec->time_base      = (AVRational){ 1, codec->sample_rate };
1726                 break;
1727             case AVMEDIA_TYPE_VIDEO:
1728                 codec->time_base = ost->filter->filter->inputs[0]->time_base;
1729
1730                 codec->width  = ost->filter->filter->inputs[0]->w;
1731                 codec->height = ost->filter->filter->inputs[0]->h;
1732                 codec->sample_aspect_ratio = ost->st->sample_aspect_ratio =
1733                     ost->frame_aspect_ratio ? // overridden by the -aspect cli option
1734                     av_d2q(ost->frame_aspect_ratio * codec->height/codec->width, 255) :
1735                     ost->filter->filter->inputs[0]->sample_aspect_ratio;
1736                 codec->pix_fmt = ost->filter->filter->inputs[0]->format;
1737
1738                 if (icodec &&
1739                     (codec->width   != icodec->width  ||
1740                      codec->height  != icodec->height ||
1741                      codec->pix_fmt != icodec->pix_fmt)) {
1742                     codec->bits_per_raw_sample = 0;
1743                 }
1744
1745                 if (ost->forced_keyframes)
1746                     parse_forced_key_frames(ost->forced_keyframes, ost,
1747                                             ost->st->codec);
1748                 break;
1749             case AVMEDIA_TYPE_SUBTITLE:
1750                 codec->time_base = (AVRational){1, 1000};
1751                 break;
1752             default:
1753                 abort();
1754                 break;
1755             }
1756             /* two pass mode */
1757             if ((codec->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2))) {
1758                 char logfilename[1024];
1759                 FILE *f;
1760
1761                 snprintf(logfilename, sizeof(logfilename), "%s-%d.log",
1762                          ost->logfile_prefix ? ost->logfile_prefix :
1763                                                DEFAULT_PASS_LOGFILENAME_PREFIX,
1764                          i);
1765                 if (!strcmp(ost->enc->name, "libx264")) {
1766                     av_dict_set(&ost->opts, "stats", logfilename, AV_DICT_DONT_OVERWRITE);
1767                 } else {
1768                     if (codec->flags & CODEC_FLAG_PASS1) {
1769                         f = fopen(logfilename, "wb");
1770                         if (!f) {
1771                             av_log(NULL, AV_LOG_FATAL, "Cannot write log file '%s' for pass-1 encoding: %s\n",
1772                                    logfilename, strerror(errno));
1773                             exit(1);
1774                         }
1775                         ost->logfile = f;
1776                     } else {
1777                         char  *logbuffer;
1778                         size_t logbuffer_size;
1779                         if (cmdutils_read_file(logfilename, &logbuffer, &logbuffer_size) < 0) {
1780                             av_log(NULL, AV_LOG_FATAL, "Error reading log file '%s' for pass-2 encoding\n",
1781                                    logfilename);
1782                             exit(1);
1783                         }
1784                         codec->stats_in = logbuffer;
1785                     }
1786                 }
1787             }
1788         }
1789     }
1790
1791     /* open each encoder */
1792     for (i = 0; i < nb_output_streams; i++) {
1793         ost = output_streams[i];
1794         if (ost->encoding_needed) {
1795             AVCodec      *codec = ost->enc;
1796             AVCodecContext *dec = NULL;
1797
1798             if ((ist = get_input_stream(ost)))
1799                 dec = ist->st->codec;
1800             if (dec && dec->subtitle_header) {
1801                 ost->st->codec->subtitle_header = av_malloc(dec->subtitle_header_size);
1802                 if (!ost->st->codec->subtitle_header) {
1803                     ret = AVERROR(ENOMEM);
1804                     goto dump_format;
1805                 }
1806                 memcpy(ost->st->codec->subtitle_header, dec->subtitle_header, dec->subtitle_header_size);
1807                 ost->st->codec->subtitle_header_size = dec->subtitle_header_size;
1808             }
1809             if (!av_dict_get(ost->opts, "threads", NULL, 0))
1810                 av_dict_set(&ost->opts, "threads", "auto", 0);
1811             if (avcodec_open2(ost->st->codec, codec, &ost->opts) < 0) {
1812                 snprintf(error, sizeof(error), "Error while opening encoder for output stream #%d:%d - maybe incorrect parameters such as bit_rate, rate, width or height",
1813                         ost->file_index, ost->index);
1814                 ret = AVERROR(EINVAL);
1815                 goto dump_format;
1816             }
1817             assert_codec_experimental(ost->st->codec, 1);
1818             assert_avoptions(ost->opts);
1819             if (ost->st->codec->bit_rate && ost->st->codec->bit_rate < 1000)
1820                 av_log(NULL, AV_LOG_WARNING, "The bitrate parameter is set too low."
1821                                              "It takes bits/s as argument, not kbits/s\n");
1822             extra_size += ost->st->codec->extradata_size;
1823
1824             if (ost->st->codec->me_threshold)
1825                 input_streams[ost->source_index]->st->codec->debug |= FF_DEBUG_MV;
1826         }
1827     }
1828
1829     /* init input streams */
1830     for (i = 0; i < nb_input_streams; i++)
1831         if ((ret = init_input_stream(i, error, sizeof(error))) < 0)
1832             goto dump_format;
1833
1834     /* discard unused programs */
1835     for (i = 0; i < nb_input_files; i++) {
1836         InputFile *ifile = input_files[i];
1837         for (j = 0; j < ifile->ctx->nb_programs; j++) {
1838             AVProgram *p = ifile->ctx->programs[j];
1839             int discard  = AVDISCARD_ALL;
1840
1841             for (k = 0; k < p->nb_stream_indexes; k++)
1842                 if (!input_streams[ifile->ist_index + p->stream_index[k]]->discard) {
1843                     discard = AVDISCARD_DEFAULT;
1844                     break;
1845                 }
1846             p->discard = discard;
1847         }
1848     }
1849
1850     /* open files and write file headers */
1851     for (i = 0; i < nb_output_files; i++) {
1852         oc = output_files[i]->ctx;
1853         oc->interrupt_callback = int_cb;
1854         if ((ret = avformat_write_header(oc, &output_files[i]->opts)) < 0) {
1855             char errbuf[128];
1856             const char *errbuf_ptr = errbuf;
1857             if (av_strerror(ret, errbuf, sizeof(errbuf)) < 0)
1858                 errbuf_ptr = strerror(AVUNERROR(ret));
1859             snprintf(error, sizeof(error), "Could not write header for output file #%d (incorrect codec parameters ?): %s", i, errbuf_ptr);
1860             ret = AVERROR(EINVAL);
1861             goto dump_format;
1862         }
1863         assert_avoptions(output_files[i]->opts);
1864         if (strcmp(oc->oformat->name, "rtp")) {
1865             want_sdp = 0;
1866         }
1867     }
1868
1869  dump_format:
1870     /* dump the file output parameters - cannot be done before in case
1871        of stream copy */
1872     for (i = 0; i < nb_output_files; i++) {
1873         av_dump_format(output_files[i]->ctx, i, output_files[i]->ctx->filename, 1);
1874     }
1875
1876     /* dump the stream mapping */
1877     av_log(NULL, AV_LOG_INFO, "Stream mapping:\n");
1878     for (i = 0; i < nb_input_streams; i++) {
1879         ist = input_streams[i];
1880
1881         for (j = 0; j < ist->nb_filters; j++) {
1882             if (ist->filters[j]->graph->graph_desc) {
1883                 av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d (%s) -> %s",
1884                        ist->file_index, ist->st->index, ist->dec ? ist->dec->name : "?",
1885                        ist->filters[j]->name);
1886                 if (nb_filtergraphs > 1)
1887                     av_log(NULL, AV_LOG_INFO, " (graph %d)", ist->filters[j]->graph->index);
1888                 av_log(NULL, AV_LOG_INFO, "\n");
1889             }
1890         }
1891     }
1892
1893     for (i = 0; i < nb_output_streams; i++) {
1894         ost = output_streams[i];
1895
1896         if (ost->attachment_filename) {
1897             /* an attached file */
1898             av_log(NULL, AV_LOG_INFO, "  File %s -> Stream #%d:%d\n",
1899                    ost->attachment_filename, ost->file_index, ost->index);
1900             continue;
1901         }
1902
1903         if (ost->filter && ost->filter->graph->graph_desc) {
1904             /* output from a complex graph */
1905             av_log(NULL, AV_LOG_INFO, "  %s", ost->filter->name);
1906             if (nb_filtergraphs > 1)
1907                 av_log(NULL, AV_LOG_INFO, " (graph %d)", ost->filter->graph->index);
1908
1909             av_log(NULL, AV_LOG_INFO, " -> Stream #%d:%d (%s)\n", ost->file_index,
1910                    ost->index, ost->enc ? ost->enc->name : "?");
1911             continue;
1912         }
1913
1914         av_log(NULL, AV_LOG_INFO, "  Stream #%d:%d -> #%d:%d",
1915                input_streams[ost->source_index]->file_index,
1916                input_streams[ost->source_index]->st->index,
1917                ost->file_index,
1918                ost->index);
1919         if (ost->sync_ist != input_streams[ost->source_index])
1920             av_log(NULL, AV_LOG_INFO, " [sync #%d:%d]",
1921                    ost->sync_ist->file_index,
1922                    ost->sync_ist->st->index);
1923         if (ost->stream_copy)
1924             av_log(NULL, AV_LOG_INFO, " (copy)");
1925         else
1926             av_log(NULL, AV_LOG_INFO, " (%s -> %s)", input_streams[ost->source_index]->dec ?
1927                    input_streams[ost->source_index]->dec->name : "?",
1928                    ost->enc ? ost->enc->name : "?");
1929         av_log(NULL, AV_LOG_INFO, "\n");
1930     }
1931
1932     if (ret) {
1933         av_log(NULL, AV_LOG_ERROR, "%s\n", error);
1934         return ret;
1935     }
1936
1937     if (want_sdp) {
1938         print_sdp();
1939     }
1940
1941     return 0;
1942 }
1943
1944 /**
1945  * @return 1 if there are still streams where more output is wanted,
1946  *         0 otherwise
1947  */
1948 static int need_output(void)
1949 {
1950     int i;
1951
1952     for (i = 0; i < nb_output_streams; i++) {
1953         OutputStream *ost    = output_streams[i];
1954         OutputFile *of       = output_files[ost->file_index];
1955         AVFormatContext *os  = output_files[ost->file_index]->ctx;
1956
1957         if (ost->finished ||
1958             (os->pb && avio_tell(os->pb) >= of->limit_filesize))
1959             continue;
1960         if (ost->frame_number >= ost->max_frames) {
1961             int j;
1962             for (j = 0; j < of->ctx->nb_streams; j++)
1963                 output_streams[of->ost_index + j]->finished = 1;
1964             continue;
1965         }
1966
1967         return 1;
1968     }
1969
1970     return 0;
1971 }
1972
1973 static InputFile *select_input_file(void)
1974 {
1975     InputFile *ifile = NULL;
1976     int64_t ipts_min = INT64_MAX;
1977     int i;
1978
1979     for (i = 0; i < nb_input_streams; i++) {
1980         InputStream *ist = input_streams[i];
1981         int64_t ipts     = ist->last_dts;
1982
1983         if (ist->discard || input_files[ist->file_index]->eagain)
1984             continue;
1985         if (!input_files[ist->file_index]->eof_reached) {
1986             if (ipts < ipts_min) {
1987                 ipts_min = ipts;
1988                 ifile    = input_files[ist->file_index];
1989             }
1990         }
1991     }
1992
1993     return ifile;
1994 }
1995
1996 #if HAVE_PTHREADS
1997 static void *input_thread(void *arg)
1998 {
1999     InputFile *f = arg;
2000     int ret = 0;
2001
2002     while (!transcoding_finished && ret >= 0) {
2003         AVPacket pkt;
2004         ret = av_read_frame(f->ctx, &pkt);
2005
2006         if (ret == AVERROR(EAGAIN)) {
2007             av_usleep(10000);
2008             ret = 0;
2009             continue;
2010         } else if (ret < 0)
2011             break;
2012
2013         pthread_mutex_lock(&f->fifo_lock);
2014         while (!av_fifo_space(f->fifo))
2015             pthread_cond_wait(&f->fifo_cond, &f->fifo_lock);
2016
2017         av_dup_packet(&pkt);
2018         av_fifo_generic_write(f->fifo, &pkt, sizeof(pkt), NULL);
2019
2020         pthread_mutex_unlock(&f->fifo_lock);
2021     }
2022
2023     f->finished = 1;
2024     return NULL;
2025 }
2026
2027 static void free_input_threads(void)
2028 {
2029     int i;
2030
2031     if (nb_input_files == 1)
2032         return;
2033
2034     transcoding_finished = 1;
2035
2036     for (i = 0; i < nb_input_files; i++) {
2037         InputFile *f = input_files[i];
2038         AVPacket pkt;
2039
2040         if (!f->fifo || f->joined)
2041             continue;
2042
2043         pthread_mutex_lock(&f->fifo_lock);
2044         while (av_fifo_size(f->fifo)) {
2045             av_fifo_generic_read(f->fifo, &pkt, sizeof(pkt), NULL);
2046             av_free_packet(&pkt);
2047         }
2048         pthread_cond_signal(&f->fifo_cond);
2049         pthread_mutex_unlock(&f->fifo_lock);
2050
2051         pthread_join(f->thread, NULL);
2052         f->joined = 1;
2053
2054         while (av_fifo_size(f->fifo)) {
2055             av_fifo_generic_read(f->fifo, &pkt, sizeof(pkt), NULL);
2056             av_free_packet(&pkt);
2057         }
2058         av_fifo_free(f->fifo);
2059     }
2060 }
2061
2062 static int init_input_threads(void)
2063 {
2064     int i, ret;
2065
2066     if (nb_input_files == 1)
2067         return 0;
2068
2069     for (i = 0; i < nb_input_files; i++) {
2070         InputFile *f = input_files[i];
2071
2072         if (!(f->fifo = av_fifo_alloc(8*sizeof(AVPacket))))
2073             return AVERROR(ENOMEM);
2074
2075         pthread_mutex_init(&f->fifo_lock, NULL);
2076         pthread_cond_init (&f->fifo_cond, NULL);
2077
2078         if ((ret = pthread_create(&f->thread, NULL, input_thread, f)))
2079             return AVERROR(ret);
2080     }
2081     return 0;
2082 }
2083
2084 static int get_input_packet_mt(InputFile *f, AVPacket *pkt)
2085 {
2086     int ret = 0;
2087
2088     pthread_mutex_lock(&f->fifo_lock);
2089
2090     if (av_fifo_size(f->fifo)) {
2091         av_fifo_generic_read(f->fifo, pkt, sizeof(*pkt), NULL);
2092         pthread_cond_signal(&f->fifo_cond);
2093     } else {
2094         if (f->finished)
2095             ret = AVERROR_EOF;
2096         else
2097             ret = AVERROR(EAGAIN);
2098     }
2099
2100     pthread_mutex_unlock(&f->fifo_lock);
2101
2102     return ret;
2103 }
2104 #endif
2105
2106 static int get_input_packet(InputFile *f, AVPacket *pkt)
2107 {
2108 #if HAVE_PTHREADS
2109     if (nb_input_files > 1)
2110         return get_input_packet_mt(f, pkt);
2111 #endif
2112     return av_read_frame(f->ctx, pkt);
2113 }
2114
2115 static int got_eagain(void)
2116 {
2117     int i;
2118     for (i = 0; i < nb_input_files; i++)
2119         if (input_files[i]->eagain)
2120             return 1;
2121     return 0;
2122 }
2123
2124 static void reset_eagain(void)
2125 {
2126     int i;
2127     for (i = 0; i < nb_input_files; i++)
2128         input_files[i]->eagain = 0;
2129 }
2130
2131 /**
2132  * Read one packet from an input file and send it for
2133  * - decoding -> lavfi (audio/video)
2134  * - decoding -> encoding -> muxing (subtitles)
2135  * - muxing (streamcopy)
2136  *
2137  * @return
2138  * - 0 -- one packet was read and processed
2139  * - AVERROR(EAGAIN) -- no packets were available for selected file,
2140  *   this function should be called again
2141  * - AVERROR_EOF -- this function should not be called again
2142  */
2143 static int process_input(void)
2144 {
2145     InputFile *ifile;
2146     AVFormatContext *is;
2147     InputStream *ist;
2148     AVPacket pkt;
2149     int ret, i, j;
2150
2151     /* select the stream that we must read now */
2152     ifile = select_input_file();
2153     /* if none, if is finished */
2154     if (!ifile) {
2155         if (got_eagain()) {
2156             reset_eagain();
2157             av_usleep(10000);
2158             return AVERROR(EAGAIN);
2159         }
2160         av_log(NULL, AV_LOG_VERBOSE, "No more inputs to read from.\n");
2161         return AVERROR_EOF;
2162     }
2163
2164     is  = ifile->ctx;
2165     ret = get_input_packet(ifile, &pkt);
2166
2167     if (ret == AVERROR(EAGAIN)) {
2168         ifile->eagain = 1;
2169         return ret;
2170     }
2171     if (ret < 0) {
2172         if (ret != AVERROR_EOF) {
2173             print_error(is->filename, ret);
2174             if (exit_on_error)
2175                 exit(1);
2176         }
2177         ifile->eof_reached = 1;
2178
2179         for (i = 0; i < ifile->nb_streams; i++) {
2180             ist = input_streams[ifile->ist_index + i];
2181             if (ist->decoding_needed)
2182                 output_packet(ist, NULL);
2183
2184             /* mark all outputs that don't go through lavfi as finished */
2185             for (j = 0; j < nb_output_streams; j++) {
2186                 OutputStream *ost = output_streams[j];
2187
2188                 if (ost->source_index == ifile->ist_index + i &&
2189                     (ost->stream_copy || ost->enc->type == AVMEDIA_TYPE_SUBTITLE))
2190                     ost->finished= 1;
2191             }
2192         }
2193
2194         return AVERROR(EAGAIN);
2195     }
2196
2197     reset_eagain();
2198
2199     if (do_pkt_dump) {
2200         av_pkt_dump_log2(NULL, AV_LOG_DEBUG, &pkt, do_hex_dump,
2201                          is->streams[pkt.stream_index]);
2202     }
2203     /* the following test is needed in case new streams appear
2204        dynamically in stream : we ignore them */
2205     if (pkt.stream_index >= ifile->nb_streams)
2206         goto discard_packet;
2207
2208     ist = input_streams[ifile->ist_index + pkt.stream_index];
2209     if (ist->discard)
2210         goto discard_packet;
2211
2212     if (pkt.dts != AV_NOPTS_VALUE)
2213         pkt.dts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
2214     if (pkt.pts != AV_NOPTS_VALUE)
2215         pkt.pts += av_rescale_q(ifile->ts_offset, AV_TIME_BASE_Q, ist->st->time_base);
2216
2217     if (pkt.pts != AV_NOPTS_VALUE)
2218         pkt.pts *= ist->ts_scale;
2219     if (pkt.dts != AV_NOPTS_VALUE)
2220         pkt.dts *= ist->ts_scale;
2221
2222     if (pkt.dts != AV_NOPTS_VALUE && ist->next_dts != AV_NOPTS_VALUE &&
2223         (is->iformat->flags & AVFMT_TS_DISCONT)) {
2224         int64_t pkt_dts = av_rescale_q(pkt.dts, ist->st->time_base, AV_TIME_BASE_Q);
2225         int64_t delta   = pkt_dts - ist->next_dts;
2226
2227         if ((FFABS(delta) > 1LL * dts_delta_threshold * AV_TIME_BASE || pkt_dts + 1 < ist->last_dts) && !copy_ts) {
2228             ifile->ts_offset -= delta;
2229             av_log(NULL, AV_LOG_DEBUG,
2230                    "timestamp discontinuity %"PRId64", new offset= %"PRId64"\n",
2231                    delta, ifile->ts_offset);
2232             pkt.dts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
2233             if (pkt.pts != AV_NOPTS_VALUE)
2234                 pkt.pts -= av_rescale_q(delta, AV_TIME_BASE_Q, ist->st->time_base);
2235         }
2236     }
2237
2238     ret = output_packet(ist, &pkt);
2239     if (ret < 0) {
2240         av_log(NULL, AV_LOG_ERROR, "Error while decoding stream #%d:%d\n",
2241                ist->file_index, ist->st->index);
2242         if (exit_on_error)
2243             exit(1);
2244     }
2245
2246 discard_packet:
2247     av_free_packet(&pkt);
2248
2249     return 0;
2250 }
2251
2252 /*
2253  * The following code is the main loop of the file converter
2254  */
2255 static int transcode(void)
2256 {
2257     int ret, i, need_input = 1;
2258     AVFormatContext *os;
2259     OutputStream *ost;
2260     InputStream *ist;
2261     int64_t timer_start;
2262
2263     ret = transcode_init();
2264     if (ret < 0)
2265         goto fail;
2266
2267     av_log(NULL, AV_LOG_INFO, "Press ctrl-c to stop encoding\n");
2268     term_init();
2269
2270     timer_start = av_gettime();
2271
2272 #if HAVE_PTHREADS
2273     if ((ret = init_input_threads()) < 0)
2274         goto fail;
2275 #endif
2276
2277     while (!received_sigterm) {
2278         /* check if there's any stream where output is still needed */
2279         if (!need_output()) {
2280             av_log(NULL, AV_LOG_VERBOSE, "No more output streams to write to, finishing.\n");
2281             break;
2282         }
2283
2284         /* read and process one input packet if needed */
2285         if (need_input) {
2286             ret = process_input();
2287             if (ret == AVERROR_EOF)
2288                 need_input = 0;
2289         }
2290
2291         ret = poll_filters();
2292         if (ret < 0) {
2293             if (ret == AVERROR_EOF || ret == AVERROR(EAGAIN))
2294                 continue;
2295
2296             av_log(NULL, AV_LOG_ERROR, "Error while filtering.\n");
2297             break;
2298         }
2299
2300         /* dump report by using the output first video and audio streams */
2301         print_report(0, timer_start);
2302     }
2303 #if HAVE_PTHREADS
2304     free_input_threads();
2305 #endif
2306
2307     /* at the end of stream, we must flush the decoder buffers */
2308     for (i = 0; i < nb_input_streams; i++) {
2309         ist = input_streams[i];
2310         if (!input_files[ist->file_index]->eof_reached && ist->decoding_needed) {
2311             output_packet(ist, NULL);
2312         }
2313     }
2314     poll_filters();
2315     flush_encoders();
2316
2317     term_exit();
2318
2319     /* write the trailer if needed and close file */
2320     for (i = 0; i < nb_output_files; i++) {
2321         os = output_files[i]->ctx;
2322         av_write_trailer(os);
2323     }
2324
2325     /* dump report by using the first video and audio streams */
2326     print_report(1, timer_start);
2327
2328     /* close each encoder */
2329     for (i = 0; i < nb_output_streams; i++) {
2330         ost = output_streams[i];
2331         if (ost->encoding_needed) {
2332             av_freep(&ost->st->codec->stats_in);
2333             avcodec_close(ost->st->codec);
2334         }
2335     }
2336
2337     /* close each decoder */
2338     for (i = 0; i < nb_input_streams; i++) {
2339         ist = input_streams[i];
2340         if (ist->decoding_needed) {
2341             avcodec_close(ist->st->codec);
2342         }
2343     }
2344
2345     /* finished ! */
2346     ret = 0;
2347
2348  fail:
2349 #if HAVE_PTHREADS
2350     free_input_threads();
2351 #endif
2352
2353     if (output_streams) {
2354         for (i = 0; i < nb_output_streams; i++) {
2355             ost = output_streams[i];
2356             if (ost) {
2357                 if (ost->stream_copy)
2358                     av_freep(&ost->st->codec->extradata);
2359                 if (ost->logfile) {
2360                     fclose(ost->logfile);
2361                     ost->logfile = NULL;
2362                 }
2363                 av_freep(&ost->st->codec->subtitle_header);
2364                 av_free(ost->forced_kf_pts);
2365                 av_dict_free(&ost->opts);
2366             }
2367         }
2368     }
2369     return ret;
2370 }
2371
2372 static int64_t getutime(void)
2373 {
2374 #if HAVE_GETRUSAGE
2375     struct rusage rusage;
2376
2377     getrusage(RUSAGE_SELF, &rusage);
2378     return (rusage.ru_utime.tv_sec * 1000000LL) + rusage.ru_utime.tv_usec;
2379 #elif HAVE_GETPROCESSTIMES
2380     HANDLE proc;
2381     FILETIME c, e, k, u;
2382     proc = GetCurrentProcess();
2383     GetProcessTimes(proc, &c, &e, &k, &u);
2384     return ((int64_t) u.dwHighDateTime << 32 | u.dwLowDateTime) / 10;
2385 #else
2386     return av_gettime();
2387 #endif
2388 }
2389
2390 static int64_t getmaxrss(void)
2391 {
2392 #if HAVE_GETRUSAGE && HAVE_STRUCT_RUSAGE_RU_MAXRSS
2393     struct rusage rusage;
2394     getrusage(RUSAGE_SELF, &rusage);
2395     return (int64_t)rusage.ru_maxrss * 1024;
2396 #elif HAVE_GETPROCESSMEMORYINFO
2397     HANDLE proc;
2398     PROCESS_MEMORY_COUNTERS memcounters;
2399     proc = GetCurrentProcess();
2400     memcounters.cb = sizeof(memcounters);
2401     GetProcessMemoryInfo(proc, &memcounters, sizeof(memcounters));
2402     return memcounters.PeakPagefileUsage;
2403 #else
2404     return 0;
2405 #endif
2406 }
2407
2408 static void parse_cpuflags(int argc, char **argv, const OptionDef *options)
2409 {
2410     int idx = locate_option(argc, argv, options, "cpuflags");
2411     if (idx && argv[idx + 1])
2412         opt_cpuflags(NULL, "cpuflags", argv[idx + 1]);
2413 }
2414
2415 int main(int argc, char **argv)
2416 {
2417     OptionsContext o = { 0 };
2418     int64_t ti;
2419
2420     atexit(exit_program);
2421
2422     reset_options(&o);
2423
2424     av_log_set_flags(AV_LOG_SKIP_REPEATED);
2425     parse_loglevel(argc, argv, options);
2426
2427     avcodec_register_all();
2428 #if CONFIG_AVDEVICE
2429     avdevice_register_all();
2430 #endif
2431     avfilter_register_all();
2432     av_register_all();
2433     avformat_network_init();
2434
2435     show_banner();
2436
2437     parse_cpuflags(argc, argv, options);
2438
2439     /* parse options */
2440     parse_options(&o, argc, argv, options, opt_output_file);
2441
2442     if (nb_output_files <= 0 && nb_input_files == 0) {
2443         show_usage();
2444         av_log(NULL, AV_LOG_WARNING, "Use -h to get full help or, even better, run 'man %s'\n", program_name);
2445         exit(1);
2446     }
2447
2448     /* file converter / grab */
2449     if (nb_output_files <= 0) {
2450         fprintf(stderr, "At least one output file must be specified\n");
2451         exit(1);
2452     }
2453
2454     ti = getutime();
2455     if (transcode() < 0)
2456         exit(1);
2457     ti = getutime() - ti;
2458     if (do_benchmark) {
2459         int maxrss = getmaxrss() / 1024;
2460         printf("bench: utime=%0.3fs maxrss=%ikB\n", ti / 1000000.0, maxrss);
2461     }
2462
2463     exit(0);
2464     return 0;
2465 }