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

   1 /*
   2  * ffmpeg filter configuration
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stdint.h>
  22
  23 #include "ffmpeg.h"
  24
  25 #include "libavfilter/avfilter.h"
  26 #include "libavfilter/buffersink.h"
  27
  28 #include "libavresample/avresample.h"
  29
  30 #include "libavutil/avassert.h"
  31 #include "libavutil/avstring.h"
  32 #include "libavutil/bprint.h"
  33 #include "libavutil/channel_layout.h"
  34 #include "libavutil/display.h"
  35 #include "libavutil/opt.h"
  36 #include "libavutil/pixdesc.h"
  37 #include "libavutil/pixfmt.h"
  38 #include "libavutil/imgutils.h"
  39 #include "libavutil/samplefmt.h"
  40
  41 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
  42 {
  43     if (codec && codec->pix_fmts) {
  44         const enum AVPixelFormat *p = codec->pix_fmts;
  45         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  46         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  47         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  48         static const enum AVPixelFormat mjpeg_formats[] =
  49             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  50         static const enum AVPixelFormat ljpeg_formats[] =
  51             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  52               AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  53
  54         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  55             if (enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
  56                 p = mjpeg_formats;
  57             } else if (enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
  58                 p =ljpeg_formats;
  59             }
  60         }
  61         for (; *p != AV_PIX_FMT_NONE; p++) {
  62             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  63             if (*p == target)
  64                 break;
  65         }
  66         if (*p == AV_PIX_FMT_NONE) {
  67             if (target != AV_PIX_FMT_NONE)
  68                 av_log(NULL, AV_LOG_WARNING,
  69                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  70                        av_get_pix_fmt_name(target),
  71                        codec->name,
  72                        av_get_pix_fmt_name(best));
  73             return best;
  74         }
  75     }
  76     return target;
  77 }
  78
  79 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  80 {
  81     if (codec && codec->sample_fmts) {
  82         const enum AVSampleFormat *p = codec->sample_fmts;
  83         for (; *p != -1; p++) {
  84             if (*p == st->codec->sample_fmt)
  85                 break;
  86         }
  87         if (*p == -1) {
  88             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  89                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  90             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  91             av_log(NULL, AV_LOG_WARNING,
  92                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  93                    av_get_sample_fmt_name(st->codec->sample_fmt),
  94                    codec->name,
  95                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  96             st->codec->sample_fmt = codec->sample_fmts[0];
  97         }
  98     }
  99 }
 100
 101 static char *choose_pix_fmts(OutputStream *ost)
 102 {
 103     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
 104     if (strict_dict)
 105         // used by choose_pixel_fmt() and below
 106         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
 107
 108      if (ost->keep_pix_fmt) {
 109         if (ost->filter)
 110             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
 111                                             AVFILTER_AUTO_CONVERT_NONE);
 112         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
 113             return NULL;
 114         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
 115     }
 116     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
 117         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
 118     } else if (ost->enc && ost->enc->pix_fmts) {
 119         const enum AVPixelFormat *p;
 120         AVIOContext *s = NULL;
 121         uint8_t *ret;
 122         int len;
 123
 124         if (avio_open_dyn_buf(&s) < 0)
 125             exit_program(1);
 126
 127         p = ost->enc->pix_fmts;
 128         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 129             if (ost->enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
 130                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 131             } else if (ost->enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
 132                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 133                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 134             }
 135         }
 136
 137         for (; *p != AV_PIX_FMT_NONE; p++) {
 138             const char *name = av_get_pix_fmt_name(*p);
 139             avio_printf(s, "%s|", name);
 140         }
 141         len = avio_close_dyn_buf(s, &ret);
 142         ret[len - 1] = 0;
 143         return ret;
 144     } else
 145         return NULL;
 146 }
 147
 148 /* Define a function for building a string containing a list of
 149  * allowed formats. */
 150 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 151 static char *choose_ ## var ## s(OutputStream *ost)                            \
 152 {                                                                              \
 153     if (ost->enc_ctx->var != none) {                                           \
 154         get_name(ost->enc_ctx->var);                                           \
 155         return av_strdup(name);                                                \
 156     } else if (ost->enc && ost->enc->supported_list) {                         \
 157         const type *p;                                                         \
 158         AVIOContext *s = NULL;                                                 \
 159         uint8_t *ret;                                                          \
 160         int len;                                                               \
 161                                                                                \
 162         if (avio_open_dyn_buf(&s) < 0)                                         \
 163             exit_program(1);                                                           \
 164                                                                                \
 165         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 166             get_name(*p);                                                      \
 167             avio_printf(s, "%s|", name);                                       \
 168         }                                                                      \
 169         len = avio_close_dyn_buf(s, &ret);                                     \
 170         ret[len - 1] = 0;                                                      \
 171         return ret;                                                            \
 172     } else                                                                     \
 173         return NULL;                                                           \
 174 }
 175
 176 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 177 //                   GET_PIX_FMT_NAME)
 178
 179 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 180                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 181
 182 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 183                   GET_SAMPLE_RATE_NAME)
 184
 185 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 186                   GET_CH_LAYOUT_NAME)
 187
 188 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 189 {
 190     FilterGraph *fg = av_mallocz(sizeof(*fg));
 191
 192     if (!fg)
 193         exit_program(1);
 194     fg->index = nb_filtergraphs;
 195
 196     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 197     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 198         exit_program(1);
 199     fg->outputs[0]->ost   = ost;
 200     fg->outputs[0]->graph = fg;
 201
 202     ost->filter = fg->outputs[0];
 203
 204     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 205     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 206         exit_program(1);
 207     fg->inputs[0]->ist   = ist;
 208     fg->inputs[0]->graph = fg;
 209
 210     GROW_ARRAY(ist->filters, ist->nb_filters);
 211     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 212
 213     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 214     filtergraphs[nb_filtergraphs - 1] = fg;
 215
 216     return fg;
 217 }
 218
 219 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 220 {
 221     InputStream *ist = NULL;
 222     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 223     int i;
 224
 225     // TODO: support other filter types
 226     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 227         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 228                "currently.\n");
 229         exit_program(1);
 230     }
 231
 232     if (in->name) {
 233         AVFormatContext *s;
 234         AVStream       *st = NULL;
 235         char *p;
 236         int file_idx = strtol(in->name, &p, 0);
 237
 238         if (file_idx < 0 || file_idx >= nb_input_files) {
 239             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 240                    file_idx, fg->graph_desc);
 241             exit_program(1);
 242         }
 243         s = input_files[file_idx]->ctx;
 244
 245         for (i = 0; i < s->nb_streams; i++) {
 246             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 247             if (stream_type != type &&
 248                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 249                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 250                 continue;
 251             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 252                 st = s->streams[i];
 253                 break;
 254             }
 255         }
 256         if (!st) {
 257             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 258                    "matches no streams.\n", p, fg->graph_desc);
 259             exit_program(1);
 260         }
 261         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 262     } else {
 263         /* find the first unused stream of corresponding type */
 264         for (i = 0; i < nb_input_streams; i++) {
 265             ist = input_streams[i];
 266             if (ist->dec_ctx->codec_type == type && ist->discard)
 267                 break;
 268         }
 269         if (i == nb_input_streams) {
 270             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 271                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 272                    in->filter_ctx->name);
 273             exit_program(1);
 274         }
 275     }
 276     av_assert0(ist);
 277
 278     ist->discard         = 0;
 279     ist->decoding_needed |= DECODING_FOR_FILTER;
 280     ist->st->discard = AVDISCARD_NONE;
 281
 282     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 283     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 284         exit_program(1);
 285     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 286     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 287
 288     GROW_ARRAY(ist->filters, ist->nb_filters);
 289     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 290 }
 291
 292 int init_complex_filtergraph(FilterGraph *fg)
 293 {
 294     AVFilterInOut *inputs, *outputs, *cur;
 295     AVFilterGraph *graph;
 296     int ret = 0;
 297
 298     /* this graph is only used for determining the kinds of inputs
 299      * and outputs we have, and is discarded on exit from this function */
 300     graph = avfilter_graph_alloc();
 301     if (!graph)
 302         return AVERROR(ENOMEM);
 303
 304     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 305     if (ret < 0)
 306         goto fail;
 307
 308     for (cur = inputs; cur; cur = cur->next)
 309         init_input_filter(fg, cur);
 310
 311     for (cur = outputs; cur;) {
 312         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 313         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 314         if (!fg->outputs[fg->nb_outputs - 1])
 315             exit_program(1);
 316
 317         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 318         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 319         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 320                                                                          cur->pad_idx);
 321         cur = cur->next;
 322         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 323     }
 324
 325 fail:
 326     avfilter_inout_free(&inputs);
 327     avfilter_graph_free(&graph);
 328     return ret;
 329 }
 330
 331 static int insert_trim(int64_t start_time, int64_t duration,
 332                        AVFilterContext **last_filter, int *pad_idx,
 333                        const char *filter_name)
 334 {
 335     AVFilterGraph *graph = (*last_filter)->graph;
 336     AVFilterContext *ctx;
 337     const AVFilter *trim;
 338     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 339     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 340     int ret = 0;
 341
 342     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 343         return 0;
 344
 345     trim = avfilter_get_by_name(name);
 346     if (!trim) {
 347         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 348                "recording time.\n", name);
 349         return AVERROR_FILTER_NOT_FOUND;
 350     }
 351
 352     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 353     if (!ctx)
 354         return AVERROR(ENOMEM);
 355
 356     if (duration != INT64_MAX) {
 357         ret = av_opt_set_int(ctx, "durationi", duration,
 358                                 AV_OPT_SEARCH_CHILDREN);
 359     }
 360     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 361         ret = av_opt_set_int(ctx, "starti", start_time,
 362                                 AV_OPT_SEARCH_CHILDREN);
 363     }
 364     if (ret < 0) {
 365         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 366         return ret;
 367     }
 368
 369     ret = avfilter_init_str(ctx, NULL);
 370     if (ret < 0)
 371         return ret;
 372
 373     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 374     if (ret < 0)
 375         return ret;
 376
 377     *last_filter = ctx;
 378     *pad_idx     = 0;
 379     return 0;
 380 }
 381
 382 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 383                          const char *filter_name, const char *args)
 384 {
 385     AVFilterGraph *graph = (*last_filter)->graph;
 386     AVFilterContext *ctx;
 387     int ret;
 388
 389     ret = avfilter_graph_create_filter(&ctx,
 390                                        avfilter_get_by_name(filter_name),
 391                                        filter_name, args, NULL, graph);
 392     if (ret < 0)
 393         return ret;
 394
 395     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 396     if (ret < 0)
 397         return ret;
 398
 399     *last_filter = ctx;
 400     *pad_idx     = 0;
 401     return 0;
 402 }
 403
 404 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 405 {
 406     char *pix_fmts;
 407     OutputStream *ost = ofilter->ost;
 408     OutputFile    *of = output_files[ost->file_index];
 409     AVCodecContext *codec = ost->enc_ctx;
 410     AVFilterContext *last_filter = out->filter_ctx;
 411     int pad_idx = out->pad_idx;
 412     int ret;
 413     char name[255];
 414
 415     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 416     ret = avfilter_graph_create_filter(&ofilter->filter,
 417                                        avfilter_get_by_name("buffersink"),
 418                                        name, NULL, NULL, fg->graph);
 419
 420     if (ret < 0)
 421         return ret;
 422
 423     if (codec->width || codec->height) {
 424         char args[255];
 425         AVFilterContext *filter;
 426
 427         snprintf(args, sizeof(args), "%d:%d:0x%X",
 428                  codec->width,
 429                  codec->height,
 430                  (unsigned)ost->sws_flags);
 431         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 432                  ost->file_index, ost->index);
 433         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 434                                                 name, args, NULL, fg->graph)) < 0)
 435             return ret;
 436         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 437             return ret;
 438
 439         last_filter = filter;
 440         pad_idx = 0;
 441     }
 442
 443     if ((pix_fmts = choose_pix_fmts(ost))) {
 444         AVFilterContext *filter;
 445         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 446                  ost->file_index, ost->index);
 447         ret = avfilter_graph_create_filter(&filter,
 448                                            avfilter_get_by_name("format"),
 449                                            "format", pix_fmts, NULL, fg->graph);
 450         av_freep(&pix_fmts);
 451         if (ret < 0)
 452             return ret;
 453         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 454             return ret;
 455
 456         last_filter = filter;
 457         pad_idx     = 0;
 458     }
 459
 460     if (ost->frame_rate.num && 0) {
 461         AVFilterContext *fps;
 462         char args[255];
 463
 464         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 465                  ost->frame_rate.den);
 466         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 467                  ost->file_index, ost->index);
 468         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 469                                            name, args, NULL, fg->graph);
 470         if (ret < 0)
 471             return ret;
 472
 473         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 474         if (ret < 0)
 475             return ret;
 476         last_filter = fps;
 477         pad_idx = 0;
 478     }
 479
 480     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 481              ost->file_index, ost->index);
 482     ret = insert_trim(of->start_time, of->recording_time,
 483                       &last_filter, &pad_idx, name);
 484     if (ret < 0)
 485         return ret;
 486
 487
 488     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 489         return ret;
 490
 491     return 0;
 492 }
 493
 494 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 495 {
 496     OutputStream *ost = ofilter->ost;
 497     OutputFile    *of = output_files[ost->file_index];
 498     AVCodecContext *codec  = ost->enc_ctx;
 499     AVFilterContext *last_filter = out->filter_ctx;
 500     int pad_idx = out->pad_idx;
 501     char *sample_fmts, *sample_rates, *channel_layouts;
 502     char name[255];
 503     int ret;
 504
 505     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 506     ret = avfilter_graph_create_filter(&ofilter->filter,
 507                                        avfilter_get_by_name("abuffersink"),
 508                                        name, NULL, NULL, fg->graph);
 509     if (ret < 0)
 510         return ret;
 511     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 512         return ret;
 513
 514 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 515     AVFilterContext *filt_ctx;                                              \
 516                                                                             \
 517     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 518            "similarly to -af " filter_name "=%s.\n", arg);                  \
 519                                                                             \
 520     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 521                                        avfilter_get_by_name(filter_name),   \
 522                                        filter_name, arg, NULL, fg->graph);  \
 523     if (ret < 0)                                                            \
 524         return ret;                                                         \
 525                                                                             \
 526     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 527     if (ret < 0)                                                            \
 528         return ret;                                                         \
 529                                                                             \
 530     last_filter = filt_ctx;                                                 \
 531     pad_idx = 0;                                                            \
 532 } while (0)
 533     if (ost->audio_channels_mapped) {
 534         int i;
 535         AVBPrint pan_buf;
 536         av_bprint_init(&pan_buf, 256, 8192);
 537         av_bprintf(&pan_buf, "0x%"PRIx64,
 538                    av_get_default_channel_layout(ost->audio_channels_mapped));
 539         for (i = 0; i < ost->audio_channels_mapped; i++)
 540             if (ost->audio_channels_map[i] != -1)
 541                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 542
 543         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 544         av_bprint_finalize(&pan_buf, NULL);
 545     }
 546
 547     if (codec->channels && !codec->channel_layout)
 548         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 549
 550     sample_fmts     = choose_sample_fmts(ost);
 551     sample_rates    = choose_sample_rates(ost);
 552     channel_layouts = choose_channel_layouts(ost);
 553     if (sample_fmts || sample_rates || channel_layouts) {
 554         AVFilterContext *format;
 555         char args[256];
 556         args[0] = 0;
 557
 558         if (sample_fmts)
 559             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 560                             sample_fmts);
 561         if (sample_rates)
 562             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 563                             sample_rates);
 564         if (channel_layouts)
 565             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 566                             channel_layouts);
 567
 568         av_freep(&sample_fmts);
 569         av_freep(&sample_rates);
 570         av_freep(&channel_layouts);
 571
 572         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 573                  ost->file_index, ost->index);
 574         ret = avfilter_graph_create_filter(&format,
 575                                            avfilter_get_by_name("aformat"),
 576                                            name, args, NULL, fg->graph);
 577         if (ret < 0)
 578             return ret;
 579
 580         ret = avfilter_link(last_filter, pad_idx, format, 0);
 581         if (ret < 0)
 582             return ret;
 583
 584         last_filter = format;
 585         pad_idx = 0;
 586     }
 587
 588     if (audio_volume != 256 && 0) {
 589         char args[256];
 590
 591         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 592         AUTO_INSERT_FILTER("-vol", "volume", args);
 593     }
 594
 595     if (ost->apad && of->shortest) {
 596         char args[256];
 597         int i;
 598
 599         for (i=0; i<of->ctx->nb_streams; i++)
 600             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 601                 break;
 602
 603         if (i<of->ctx->nb_streams) {
 604             snprintf(args, sizeof(args), "%s", ost->apad);
 605             AUTO_INSERT_FILTER("-apad", "apad", args);
 606         }
 607     }
 608
 609     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 610              ost->file_index, ost->index);
 611     ret = insert_trim(of->start_time, of->recording_time,
 612                       &last_filter, &pad_idx, name);
 613     if (ret < 0)
 614         return ret;
 615
 616     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 617         return ret;
 618
 619     return 0;
 620 }
 621
 622 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 623 {                                                                  \
 624     AVFilterContext *ctx = inout->filter_ctx;                      \
 625     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 626     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 627     AVIOContext *pb;                                               \
 628                                                                    \
 629     if (avio_open_dyn_buf(&pb) < 0)                                \
 630         exit_program(1);                                           \
 631                                                                    \
 632     avio_printf(pb, "%s", ctx->filter->name);                      \
 633     if (nb_pads > 1)                                               \
 634         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 635     avio_w8(pb, 0);                                                \
 636     avio_close_dyn_buf(pb, &f->name);                              \
 637 }
 638
 639 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 640 {
 641     av_freep(&ofilter->name);
 642     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 643
 644     if (!ofilter->ost) {
 645         av_log(NULL, AV_LOG_FATAL, "Filter %s has a unconnected output\n", ofilter->name);
 646         exit_program(1);
 647     }
 648
 649     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 650     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 651     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 652     default: av_assert0(0);
 653     }
 654 }
 655
 656 static int sub2video_prepare(InputStream *ist)
 657 {
 658     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 659     int i, w, h;
 660
 661     /* Compute the size of the canvas for the subtitles stream.
 662        If the subtitles codec has set a size, use it. Otherwise use the
 663        maximum dimensions of the video streams in the same file. */
 664     w = ist->dec_ctx->width;
 665     h = ist->dec_ctx->height;
 666     if (!(w && h)) {
 667         for (i = 0; i < avf->nb_streams; i++) {
 668             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 669                 w = FFMAX(w, avf->streams[i]->codec->width);
 670                 h = FFMAX(h, avf->streams[i]->codec->height);
 671             }
 672         }
 673         if (!(w && h)) {
 674             w = FFMAX(w, 720);
 675             h = FFMAX(h, 576);
 676         }
 677         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 678     }
 679     ist->sub2video.w = ist->dec_ctx->width  = ist->resample_width  = w;
 680     ist->sub2video.h = ist->dec_ctx->height = ist->resample_height = h;
 681
 682     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 683        palettes for all rectangles are identical or compatible */
 684     ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
 685
 686     ist->sub2video.frame = av_frame_alloc();
 687     if (!ist->sub2video.frame)
 688         return AVERROR(ENOMEM);
 689     ist->sub2video.last_pts = INT64_MIN;
 690     return 0;
 691 }
 692
 693 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 694                                         AVFilterInOut *in)
 695 {
 696     AVFilterContext *last_filter;
 697     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 698     InputStream *ist = ifilter->ist;
 699     InputFile     *f = input_files[ist->file_index];
 700     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 701                                          ist->st->time_base;
 702     AVRational fr = ist->framerate;
 703     AVRational sar;
 704     AVBPrint args;
 705     char name[255];
 706     int ret, pad_idx = 0;
 707     int64_t tsoffset = 0;
 708
 709     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
 710         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 711         return AVERROR(EINVAL);
 712     }
 713
 714     if (!fr.num)
 715         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 716
 717     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 718         ret = sub2video_prepare(ist);
 719         if (ret < 0)
 720             return ret;
 721     }
 722
 723     sar = ist->st->sample_aspect_ratio.num ?
 724           ist->st->sample_aspect_ratio :
 725           ist->dec_ctx->sample_aspect_ratio;
 726     if(!sar.den)
 727         sar = (AVRational){0,1};
 728     av_bprint_init(&args, 0, 1);
 729     av_bprintf(&args,
 730              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 731              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 732              ist->resample_height,
 733              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
 734              tb.num, tb.den, sar.num, sar.den,
 735              SWS_BILINEAR + ((ist->dec_ctx->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 736     if (fr.num && fr.den)
 737         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 738     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 739              ist->file_index, ist->st->index);
 740
 741     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 742                                             args.str, NULL, fg->graph)) < 0)
 743         return ret;
 744     last_filter = ifilter->filter;
 745
 746     if (ist->autorotate) {
 747         double theta = get_rotation(ist->st);
 748
 749         if (fabs(theta - 90) < 1.0) {
 750             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
 751         } else if (fabs(theta - 180) < 1.0) {
 752             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 753             if (ret < 0)
 754                 return ret;
 755             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 756         } else if (fabs(theta - 270) < 1.0) {
 757             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
 758         } else if (fabs(theta) > 1.0) {
 759             char rotate_buf[64];
 760             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
 761             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
 762         }
 763         if (ret < 0)
 764             return ret;
 765     }
 766
 767     if (ist->framerate.num) {
 768         AVFilterContext *setpts;
 769
 770         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 771                  ist->file_index, ist->st->index);
 772         if ((ret = avfilter_graph_create_filter(&setpts,
 773                                                 avfilter_get_by_name("setpts"),
 774                                                 name, "N", NULL,
 775                                                 fg->graph)) < 0)
 776             return ret;
 777
 778         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 779             return ret;
 780
 781         last_filter = setpts;
 782     }
 783
 784     if (do_deinterlace) {
 785         AVFilterContext *yadif;
 786
 787         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 788                  ist->file_index, ist->st->index);
 789         if ((ret = avfilter_graph_create_filter(&yadif,
 790                                                 avfilter_get_by_name("yadif"),
 791                                                 name, "", NULL,
 792                                                 fg->graph)) < 0)
 793             return ret;
 794
 795         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 796             return ret;
 797
 798         last_filter = yadif;
 799     }
 800
 801     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 802              ist->file_index, ist->st->index);
 803     if (copy_ts) {
 804         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 805         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 806             tsoffset += f->ctx->start_time;
 807     }
 808     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 809                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 810                       &last_filter, &pad_idx, name);
 811     if (ret < 0)
 812         return ret;
 813
 814     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 815         return ret;
 816     return 0;
 817 }
 818
 819 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 820                                         AVFilterInOut *in)
 821 {
 822     AVFilterContext *last_filter;
 823     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 824     InputStream *ist = ifilter->ist;
 825     InputFile     *f = input_files[ist->file_index];
 826     AVBPrint args;
 827     char name[255];
 828     int ret, pad_idx = 0;
 829     int64_t tsoffset = 0;
 830
 831     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
 832         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 833         return AVERROR(EINVAL);
 834     }
 835
 836     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 837     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 838              1, ist->dec_ctx->sample_rate,
 839              ist->dec_ctx->sample_rate,
 840              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
 841     if (ist->dec_ctx->channel_layout)
 842         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 843                    ist->dec_ctx->channel_layout);
 844     else
 845         av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
 846     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 847              ist->file_index, ist->st->index);
 848
 849     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 850                                             name, args.str, NULL,
 851                                             fg->graph)) < 0)
 852         return ret;
 853     last_filter = ifilter->filter;
 854
 855 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 856     AVFilterContext *filt_ctx;                                              \
 857                                                                             \
 858     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 859            "similarly to -af " filter_name "=%s.\n", arg);                  \
 860                                                                             \
 861     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 862                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 863     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 864                                        avfilter_get_by_name(filter_name),   \
 865                                        name, arg, NULL, fg->graph);         \
 866     if (ret < 0)                                                            \
 867         return ret;                                                         \
 868                                                                             \
 869     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 870     if (ret < 0)                                                            \
 871         return ret;                                                         \
 872                                                                             \
 873     last_filter = filt_ctx;                                                 \
 874 } while (0)
 875
 876     if (audio_sync_method > 0) {
 877         char args[256] = {0};
 878
 879         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 880         if (audio_drift_threshold != 0.1)
 881             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 882         if (!fg->reconfiguration)
 883             av_strlcatf(args, sizeof(args), ":first_pts=0");
 884         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 885     }
 886
 887 //     if (ost->audio_channels_mapped) {
 888 //         int i;
 889 //         AVBPrint pan_buf;
 890 //         av_bprint_init(&pan_buf, 256, 8192);
 891 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 892 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 893 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 894 //             if (ost->audio_channels_map[i] != -1)
 895 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 896 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 897 //         av_bprint_finalize(&pan_buf, NULL);
 898 //     }
 899
 900     if (audio_volume != 256) {
 901         char args[256];
 902
 903         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 904                "audio filter instead.\n");
 905
 906         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 907         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 908     }
 909
 910     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 911              ist->file_index, ist->st->index);
 912     if (copy_ts) {
 913         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 914         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 915             tsoffset += f->ctx->start_time;
 916     }
 917     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 918                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 919                       &last_filter, &pad_idx, name);
 920     if (ret < 0)
 921         return ret;
 922
 923     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 924         return ret;
 925
 926     return 0;
 927 }
 928
 929 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 930                                   AVFilterInOut *in)
 931 {
 932     av_freep(&ifilter->name);
 933     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 934
 935     if (!ifilter->ist->dec) {
 936         av_log(NULL, AV_LOG_ERROR,
 937                "No decoder for stream #%d:%d, filtering impossible\n",
 938                ifilter->ist->file_index, ifilter->ist->st->index);
 939         return AVERROR_DECODER_NOT_FOUND;
 940     }
 941     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 942     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 943     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 944     default: av_assert0(0);
 945     }
 946 }
 947
 948 int configure_filtergraph(FilterGraph *fg)
 949 {
 950     AVFilterInOut *inputs, *outputs, *cur;
 951     int ret, i, simple = !fg->graph_desc;
 952     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 953                                       fg->graph_desc;
 954
 955     avfilter_graph_free(&fg->graph);
 956     if (!(fg->graph = avfilter_graph_alloc()))
 957         return AVERROR(ENOMEM);
 958
 959     if (simple) {
 960         OutputStream *ost = fg->outputs[0]->ost;
 961         char args[512];
 962         AVDictionaryEntry *e = NULL;
 963
 964         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 965         fg->graph->scale_sws_opts = av_strdup(args);
 966
 967         args[0] = 0;
 968         while ((e = av_dict_get(ost->swr_opts, "", e,
 969                                 AV_DICT_IGNORE_SUFFIX))) {
 970             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 971         }
 972         if (strlen(args))
 973             args[strlen(args)-1] = 0;
 974         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 975
 976         args[0] = '\0';
 977         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 978                                 AV_DICT_IGNORE_SUFFIX))) {
 979             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 980         }
 981         if (strlen(args))
 982             args[strlen(args) - 1] = '\0';
 983         fg->graph->resample_lavr_opts = av_strdup(args);
 984
 985         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
 986         if (e)
 987             av_opt_set(fg->graph, "threads", e->value, 0);
 988     }
 989
 990     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 991         return ret;
 992
 993     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 994         const char *num_inputs;
 995         const char *num_outputs;
 996         if (!outputs) {
 997             num_outputs = "0";
 998         } else if (outputs->next) {
 999             num_outputs = ">1";
1000         } else {
1001             num_outputs = "1";
1002         }
1003         if (!inputs) {
1004             num_inputs = "0";
1005         } else if (inputs->next) {
1006             num_inputs = ">1";
1007         } else {
1008             num_inputs = "1";
1009         }
1010         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1011                "to have exactly 1 input and 1 output."
1012                " However, it had %s input(s) and %s output(s)."
1013                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1014                graph_desc, num_inputs, num_outputs);
1015         return AVERROR(EINVAL);
1016     }
1017
1018     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1019         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1020             avfilter_inout_free(&inputs);
1021             avfilter_inout_free(&outputs);
1022             return ret;
1023         }
1024     avfilter_inout_free(&inputs);
1025
1026     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1027         configure_output_filter(fg, fg->outputs[i], cur);
1028     avfilter_inout_free(&outputs);
1029
1030     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1031         return ret;
1032
1033     fg->reconfiguration = 1;
1034
1035     for (i = 0; i < fg->nb_outputs; i++) {
1036         OutputStream *ost = fg->outputs[i]->ost;
1037         if (ost &&
1038             ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1039             !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
1040             av_buffersink_set_frame_size(ost->filter->filter,
1041                                          ost->enc_ctx->frame_size);
1042     }
1043
1044     return 0;
1045 }
1046
1047 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1048 {
1049     int i;
1050     for (i = 0; i < fg->nb_inputs; i++)
1051         if (fg->inputs[i]->ist == ist)
1052             return 1;
1053     return 0;
1054 }
1055