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 #include "libavfilter/buffersrc.h"
  28
  29 #include "libavresample/avresample.h"
  30
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/avstring.h"
  33 #include "libavutil/bprint.h"
  34 #include "libavutil/channel_layout.h"
  35 #include "libavutil/display.h"
  36 #include "libavutil/opt.h"
  37 #include "libavutil/pixdesc.h"
  38 #include "libavutil/pixfmt.h"
  39 #include "libavutil/imgutils.h"
  40 #include "libavutil/samplefmt.h"
  41
  42 int filter_nbthreads = -1;
  43 int filter_complex_nbthreads = -1;
  44
  45 static const enum AVPixelFormat *get_compliance_unofficial_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
  46 {
  47     static const enum AVPixelFormat mjpeg_formats[] =
  48         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
  49           AV_PIX_FMT_YUV420P,  AV_PIX_FMT_YUV422P,  AV_PIX_FMT_YUV444P,
  50           AV_PIX_FMT_NONE };
  51     static const enum AVPixelFormat ljpeg_formats[] =
  52         { AV_PIX_FMT_BGR24   , AV_PIX_FMT_BGRA    , AV_PIX_FMT_BGR0,
  53           AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
  54           AV_PIX_FMT_YUV420P , AV_PIX_FMT_YUV444P , AV_PIX_FMT_YUV422P,
  55           AV_PIX_FMT_NONE};
  56
  57     if (codec_id == AV_CODEC_ID_MJPEG) {
  58         return mjpeg_formats;
  59     } else if (codec_id == AV_CODEC_ID_LJPEG) {
  60         return ljpeg_formats;
  61     } else {
  62         return default_formats;
  63     }
  64 }
  65
  66 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
  67 {
  68     if (codec && codec->pix_fmts) {
  69         const enum AVPixelFormat *p = codec->pix_fmts;
  70         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  71         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  72         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  73
  74         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  75             p = get_compliance_unofficial_pix_fmts(enc_ctx->codec_id, p);
  76         }
  77         for (; *p != AV_PIX_FMT_NONE; p++) {
  78             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  79             if (*p == target)
  80                 break;
  81         }
  82         if (*p == AV_PIX_FMT_NONE) {
  83             if (target != AV_PIX_FMT_NONE)
  84                 av_log(NULL, AV_LOG_WARNING,
  85                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  86                        av_get_pix_fmt_name(target),
  87                        codec->name,
  88                        av_get_pix_fmt_name(best));
  89             return best;
  90         }
  91     }
  92     return target;
  93 }
  94
  95 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  96 {
  97     if (codec && codec->sample_fmts) {
  98         const enum AVSampleFormat *p = codec->sample_fmts;
  99         for (; *p != -1; p++) {
 100             if (*p == st->codecpar->format)
 101                 break;
 102         }
 103         if (*p == -1) {
 104             if((codec->capabilities & AV_CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codecpar->format) > av_get_sample_fmt_name(codec->sample_fmts[0]))
 105                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
 106             if(av_get_sample_fmt_name(st->codecpar->format))
 107             av_log(NULL, AV_LOG_WARNING,
 108                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
 109                    av_get_sample_fmt_name(st->codecpar->format),
 110                    codec->name,
 111                    av_get_sample_fmt_name(codec->sample_fmts[0]));
 112             st->codecpar->format = codec->sample_fmts[0];
 113         }
 114     }
 115 }
 116
 117 static char *choose_pix_fmts(OutputFilter *ofilter)
 118 {
 119     OutputStream *ost = ofilter->ost;
 120     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
 121     if (strict_dict)
 122         // used by choose_pixel_fmt() and below
 123         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
 124
 125      if (ost->keep_pix_fmt) {
 126         avfilter_graph_set_auto_convert(ofilter->graph->graph,
 127                                             AVFILTER_AUTO_CONVERT_NONE);
 128         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
 129             return NULL;
 130         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
 131     }
 132     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
 133         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
 134     } else if (ost->enc && ost->enc->pix_fmts) {
 135         const enum AVPixelFormat *p;
 136         AVIOContext *s = NULL;
 137         uint8_t *ret;
 138         int len;
 139
 140         if (avio_open_dyn_buf(&s) < 0)
 141             exit_program(1);
 142
 143         p = ost->enc->pix_fmts;
 144         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 145             p = get_compliance_unofficial_pix_fmts(ost->enc_ctx->codec_id, p);
 146         }
 147
 148         for (; *p != AV_PIX_FMT_NONE; p++) {
 149             const char *name = av_get_pix_fmt_name(*p);
 150             avio_printf(s, "%s|", name);
 151         }
 152         len = avio_close_dyn_buf(s, &ret);
 153         ret[len - 1] = 0;
 154         return ret;
 155     } else
 156         return NULL;
 157 }
 158
 159 /* Define a function for building a string containing a list of
 160  * allowed formats. */
 161 #define DEF_CHOOSE_FORMAT(suffix, type, var, supported_list, none, get_name)   \
 162 static char *choose_ ## suffix (OutputFilter *ofilter)                         \
 163 {                                                                              \
 164     if (ofilter->var != none) {                                                \
 165         get_name(ofilter->var);                                                \
 166         return av_strdup(name);                                                \
 167     } else if (ofilter->supported_list) {                                      \
 168         const type *p;                                                         \
 169         AVIOContext *s = NULL;                                                 \
 170         uint8_t *ret;                                                          \
 171         int len;                                                               \
 172                                                                                \
 173         if (avio_open_dyn_buf(&s) < 0)                                         \
 174             exit_program(1);                                                           \
 175                                                                                \
 176         for (p = ofilter->supported_list; *p != none; p++) {                   \
 177             get_name(*p);                                                      \
 178             avio_printf(s, "%s|", name);                                       \
 179         }                                                                      \
 180         len = avio_close_dyn_buf(s, &ret);                                     \
 181         ret[len - 1] = 0;                                                      \
 182         return ret;                                                            \
 183     } else                                                                     \
 184         return NULL;                                                           \
 185 }
 186
 187 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
 188 //                  GET_PIX_FMT_NAME)
 189
 190 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
 191                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 192
 193 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
 194                   GET_SAMPLE_RATE_NAME)
 195
 196 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
 197                   GET_CH_LAYOUT_NAME)
 198
 199 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 200 {
 201     FilterGraph *fg = av_mallocz(sizeof(*fg));
 202
 203     if (!fg)
 204         exit_program(1);
 205     fg->index = nb_filtergraphs;
 206
 207     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 208     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 209         exit_program(1);
 210     fg->outputs[0]->ost   = ost;
 211     fg->outputs[0]->graph = fg;
 212     fg->outputs[0]->format = -1;
 213
 214     ost->filter = fg->outputs[0];
 215
 216     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 217     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 218         exit_program(1);
 219     fg->inputs[0]->ist   = ist;
 220     fg->inputs[0]->graph = fg;
 221     fg->inputs[0]->format = -1;
 222
 223     GROW_ARRAY(ist->filters, ist->nb_filters);
 224     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 225
 226     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 227     filtergraphs[nb_filtergraphs - 1] = fg;
 228
 229     return 0;
 230 }
 231
 232 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 233 {
 234     InputStream *ist = NULL;
 235     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 236     int i;
 237
 238     // TODO: support other filter types
 239     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 240         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 241                "currently.\n");
 242         exit_program(1);
 243     }
 244
 245     if (in->name) {
 246         AVFormatContext *s;
 247         AVStream       *st = NULL;
 248         char *p;
 249         int file_idx = strtol(in->name, &p, 0);
 250
 251         if (file_idx < 0 || file_idx >= nb_input_files) {
 252             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 253                    file_idx, fg->graph_desc);
 254             exit_program(1);
 255         }
 256         s = input_files[file_idx]->ctx;
 257
 258         for (i = 0; i < s->nb_streams; i++) {
 259             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
 260             if (stream_type != type &&
 261                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 262                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 263                 continue;
 264             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 265                 st = s->streams[i];
 266                 break;
 267             }
 268         }
 269         if (!st) {
 270             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 271                    "matches no streams.\n", p, fg->graph_desc);
 272             exit_program(1);
 273         }
 274         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 275     } else {
 276         /* find the first unused stream of corresponding type */
 277         for (i = 0; i < nb_input_streams; i++) {
 278             ist = input_streams[i];
 279             if (ist->dec_ctx->codec_type == type && ist->discard)
 280                 break;
 281         }
 282         if (i == nb_input_streams) {
 283             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 284                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 285                    in->filter_ctx->name);
 286             exit_program(1);
 287         }
 288     }
 289     av_assert0(ist);
 290
 291     ist->discard         = 0;
 292     ist->decoding_needed |= DECODING_FOR_FILTER;
 293     ist->st->discard = AVDISCARD_NONE;
 294
 295     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 296     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 297         exit_program(1);
 298     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 299     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 300     fg->inputs[fg->nb_inputs - 1]->format = -1;
 301
 302     GROW_ARRAY(ist->filters, ist->nb_filters);
 303     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 304 }
 305
 306 int init_complex_filtergraph(FilterGraph *fg)
 307 {
 308     AVFilterInOut *inputs, *outputs, *cur;
 309     AVFilterGraph *graph;
 310     int ret = 0;
 311
 312     /* this graph is only used for determining the kinds of inputs
 313      * and outputs we have, and is discarded on exit from this function */
 314     graph = avfilter_graph_alloc();
 315     if (!graph)
 316         return AVERROR(ENOMEM);
 317
 318     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 319     if (ret < 0)
 320         goto fail;
 321
 322     for (cur = inputs; cur; cur = cur->next)
 323         init_input_filter(fg, cur);
 324
 325     for (cur = outputs; cur;) {
 326         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 327         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 328         if (!fg->outputs[fg->nb_outputs - 1])
 329             exit_program(1);
 330
 331         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 332         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 333         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 334                                                                          cur->pad_idx);
 335         cur = cur->next;
 336         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 337     }
 338
 339 fail:
 340     avfilter_inout_free(&inputs);
 341     avfilter_graph_free(&graph);
 342     return ret;
 343 }
 344
 345 static int insert_trim(int64_t start_time, int64_t duration,
 346                        AVFilterContext **last_filter, int *pad_idx,
 347                        const char *filter_name)
 348 {
 349     AVFilterGraph *graph = (*last_filter)->graph;
 350     AVFilterContext *ctx;
 351     const AVFilter *trim;
 352     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 353     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 354     int ret = 0;
 355
 356     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 357         return 0;
 358
 359     trim = avfilter_get_by_name(name);
 360     if (!trim) {
 361         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 362                "recording time.\n", name);
 363         return AVERROR_FILTER_NOT_FOUND;
 364     }
 365
 366     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 367     if (!ctx)
 368         return AVERROR(ENOMEM);
 369
 370     if (duration != INT64_MAX) {
 371         ret = av_opt_set_int(ctx, "durationi", duration,
 372                                 AV_OPT_SEARCH_CHILDREN);
 373     }
 374     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 375         ret = av_opt_set_int(ctx, "starti", start_time,
 376                                 AV_OPT_SEARCH_CHILDREN);
 377     }
 378     if (ret < 0) {
 379         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 380         return ret;
 381     }
 382
 383     ret = avfilter_init_str(ctx, NULL);
 384     if (ret < 0)
 385         return ret;
 386
 387     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 388     if (ret < 0)
 389         return ret;
 390
 391     *last_filter = ctx;
 392     *pad_idx     = 0;
 393     return 0;
 394 }
 395
 396 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 397                          const char *filter_name, const char *args)
 398 {
 399     AVFilterGraph *graph = (*last_filter)->graph;
 400     AVFilterContext *ctx;
 401     int ret;
 402
 403     ret = avfilter_graph_create_filter(&ctx,
 404                                        avfilter_get_by_name(filter_name),
 405                                        filter_name, args, NULL, graph);
 406     if (ret < 0)
 407         return ret;
 408
 409     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 410     if (ret < 0)
 411         return ret;
 412
 413     *last_filter = ctx;
 414     *pad_idx     = 0;
 415     return 0;
 416 }
 417
 418 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 419 {
 420     char *pix_fmts;
 421     OutputStream *ost = ofilter->ost;
 422     OutputFile    *of = output_files[ost->file_index];
 423     AVFilterContext *last_filter = out->filter_ctx;
 424     int pad_idx = out->pad_idx;
 425     int ret;
 426     char name[255];
 427
 428     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 429     ret = avfilter_graph_create_filter(&ofilter->filter,
 430                                        avfilter_get_by_name("buffersink"),
 431                                        name, NULL, NULL, fg->graph);
 432
 433     if (ret < 0)
 434         return ret;
 435
 436     if (!hw_device_ctx && (ofilter->width || ofilter->height)) {
 437         char args[255];
 438         AVFilterContext *filter;
 439         AVDictionaryEntry *e = NULL;
 440
 441         snprintf(args, sizeof(args), "%d:%d",
 442                  ofilter->width, ofilter->height);
 443
 444         while ((e = av_dict_get(ost->sws_dict, "", e,
 445                                 AV_DICT_IGNORE_SUFFIX))) {
 446             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
 447         }
 448
 449         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 450                  ost->file_index, ost->index);
 451         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 452                                                 name, args, NULL, fg->graph)) < 0)
 453             return ret;
 454         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 455             return ret;
 456
 457         last_filter = filter;
 458         pad_idx = 0;
 459     }
 460
 461     if ((pix_fmts = choose_pix_fmts(ofilter))) {
 462         AVFilterContext *filter;
 463         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 464                  ost->file_index, ost->index);
 465         ret = avfilter_graph_create_filter(&filter,
 466                                            avfilter_get_by_name("format"),
 467                                            "format", pix_fmts, NULL, fg->graph);
 468         av_freep(&pix_fmts);
 469         if (ret < 0)
 470             return ret;
 471         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 472             return ret;
 473
 474         last_filter = filter;
 475         pad_idx     = 0;
 476     }
 477
 478     if (ost->frame_rate.num && 0) {
 479         AVFilterContext *fps;
 480         char args[255];
 481
 482         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 483                  ost->frame_rate.den);
 484         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 485                  ost->file_index, ost->index);
 486         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 487                                            name, args, NULL, fg->graph);
 488         if (ret < 0)
 489             return ret;
 490
 491         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 492         if (ret < 0)
 493             return ret;
 494         last_filter = fps;
 495         pad_idx = 0;
 496     }
 497
 498     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 499              ost->file_index, ost->index);
 500     ret = insert_trim(of->start_time, of->recording_time,
 501                       &last_filter, &pad_idx, name);
 502     if (ret < 0)
 503         return ret;
 504
 505
 506     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 507         return ret;
 508
 509     return 0;
 510 }
 511
 512 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 513 {
 514     OutputStream *ost = ofilter->ost;
 515     OutputFile    *of = output_files[ost->file_index];
 516     AVCodecContext *codec  = ost->enc_ctx;
 517     AVFilterContext *last_filter = out->filter_ctx;
 518     int pad_idx = out->pad_idx;
 519     char *sample_fmts, *sample_rates, *channel_layouts;
 520     char name[255];
 521     int ret;
 522
 523     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 524     ret = avfilter_graph_create_filter(&ofilter->filter,
 525                                        avfilter_get_by_name("abuffersink"),
 526                                        name, NULL, NULL, fg->graph);
 527     if (ret < 0)
 528         return ret;
 529     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 530         return ret;
 531
 532 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 533     AVFilterContext *filt_ctx;                                              \
 534                                                                             \
 535     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 536            "similarly to -af " filter_name "=%s.\n", arg);                  \
 537                                                                             \
 538     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 539                                        avfilter_get_by_name(filter_name),   \
 540                                        filter_name, arg, NULL, fg->graph);  \
 541     if (ret < 0)                                                            \
 542         return ret;                                                         \
 543                                                                             \
 544     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 545     if (ret < 0)                                                            \
 546         return ret;                                                         \
 547                                                                             \
 548     last_filter = filt_ctx;                                                 \
 549     pad_idx = 0;                                                            \
 550 } while (0)
 551     if (ost->audio_channels_mapped) {
 552         int i;
 553         AVBPrint pan_buf;
 554         av_bprint_init(&pan_buf, 256, 8192);
 555         av_bprintf(&pan_buf, "0x%"PRIx64,
 556                    av_get_default_channel_layout(ost->audio_channels_mapped));
 557         for (i = 0; i < ost->audio_channels_mapped; i++)
 558             if (ost->audio_channels_map[i] != -1)
 559                 av_bprintf(&pan_buf, "|c%d=c%d", i, ost->audio_channels_map[i]);
 560
 561         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 562         av_bprint_finalize(&pan_buf, NULL);
 563     }
 564
 565     if (codec->channels && !codec->channel_layout)
 566         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 567
 568     sample_fmts     = choose_sample_fmts(ofilter);
 569     sample_rates    = choose_sample_rates(ofilter);
 570     channel_layouts = choose_channel_layouts(ofilter);
 571     if (sample_fmts || sample_rates || channel_layouts) {
 572         AVFilterContext *format;
 573         char args[256];
 574         args[0] = 0;
 575
 576         if (sample_fmts)
 577             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 578                             sample_fmts);
 579         if (sample_rates)
 580             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 581                             sample_rates);
 582         if (channel_layouts)
 583             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 584                             channel_layouts);
 585
 586         av_freep(&sample_fmts);
 587         av_freep(&sample_rates);
 588         av_freep(&channel_layouts);
 589
 590         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 591                  ost->file_index, ost->index);
 592         ret = avfilter_graph_create_filter(&format,
 593                                            avfilter_get_by_name("aformat"),
 594                                            name, args, NULL, fg->graph);
 595         if (ret < 0)
 596             return ret;
 597
 598         ret = avfilter_link(last_filter, pad_idx, format, 0);
 599         if (ret < 0)
 600             return ret;
 601
 602         last_filter = format;
 603         pad_idx = 0;
 604     }
 605
 606     if (audio_volume != 256 && 0) {
 607         char args[256];
 608
 609         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 610         AUTO_INSERT_FILTER("-vol", "volume", args);
 611     }
 612
 613     if (ost->apad && of->shortest) {
 614         char args[256];
 615         int i;
 616
 617         for (i=0; i<of->ctx->nb_streams; i++)
 618             if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
 619                 break;
 620
 621         if (i<of->ctx->nb_streams) {
 622             snprintf(args, sizeof(args), "%s", ost->apad);
 623             AUTO_INSERT_FILTER("-apad", "apad", args);
 624         }
 625     }
 626
 627     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 628              ost->file_index, ost->index);
 629     ret = insert_trim(of->start_time, of->recording_time,
 630                       &last_filter, &pad_idx, name);
 631     if (ret < 0)
 632         return ret;
 633
 634     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 635         return ret;
 636
 637     return 0;
 638 }
 639
 640 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 641 {                                                                  \
 642     AVFilterContext *ctx = inout->filter_ctx;                      \
 643     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 644     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 645     AVIOContext *pb;                                               \
 646                                                                    \
 647     if (avio_open_dyn_buf(&pb) < 0)                                \
 648         exit_program(1);                                           \
 649                                                                    \
 650     avio_printf(pb, "%s", ctx->filter->name);                      \
 651     if (nb_pads > 1)                                               \
 652         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 653     avio_w8(pb, 0);                                                \
 654     avio_close_dyn_buf(pb, &f->name);                              \
 655 }
 656
 657 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 658 {
 659     av_freep(&ofilter->name);
 660     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 661
 662     if (!ofilter->ost) {
 663         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
 664         exit_program(1);
 665     }
 666
 667     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 668     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 669     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 670     default: av_assert0(0);
 671     }
 672 }
 673
 674 static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
 675 {
 676     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 677     int i, w, h;
 678
 679     /* Compute the size of the canvas for the subtitles stream.
 680        If the subtitles codecpar has set a size, use it. Otherwise use the
 681        maximum dimensions of the video streams in the same file. */
 682     w = ifilter->width;
 683     h = ifilter->height;
 684     if (!(w && h)) {
 685         for (i = 0; i < avf->nb_streams; i++) {
 686             if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 687                 w = FFMAX(w, avf->streams[i]->codecpar->width);
 688                 h = FFMAX(h, avf->streams[i]->codecpar->height);
 689             }
 690         }
 691         if (!(w && h)) {
 692             w = FFMAX(w, 720);
 693             h = FFMAX(h, 576);
 694         }
 695         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 696     }
 697     ist->sub2video.w = ist->resample_width  = ifilter->width  = w;
 698     ist->sub2video.h = ist->resample_height = ifilter->height = h;
 699
 700     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 701        palettes for all rectangles are identical or compatible */
 702     ist->resample_pix_fmt = ifilter->format = AV_PIX_FMT_RGB32;
 703
 704     ist->sub2video.frame = av_frame_alloc();
 705     if (!ist->sub2video.frame)
 706         return AVERROR(ENOMEM);
 707     ist->sub2video.last_pts = INT64_MIN;
 708     return 0;
 709 }
 710
 711 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 712                                         AVFilterInOut *in)
 713 {
 714     AVFilterContext *last_filter;
 715     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 716     InputStream *ist = ifilter->ist;
 717     InputFile     *f = input_files[ist->file_index];
 718     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 719                                          ist->st->time_base;
 720     AVRational fr = ist->framerate;
 721     AVRational sar;
 722     AVBPrint args;
 723     char name[255];
 724     int ret, pad_idx = 0;
 725     int64_t tsoffset = 0;
 726     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
 727
 728     if (!par)
 729         return AVERROR(ENOMEM);
 730     memset(par, 0, sizeof(*par));
 731     par->format = AV_PIX_FMT_NONE;
 732
 733     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
 734         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 735         ret = AVERROR(EINVAL);
 736         goto fail;
 737     }
 738
 739     if (!fr.num)
 740         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 741
 742     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 743         ret = sub2video_prepare(ist, ifilter);
 744         if (ret < 0)
 745             goto fail;
 746     }
 747
 748     sar = ifilter->sample_aspect_ratio;
 749     if(!sar.den)
 750         sar = (AVRational){0,1};
 751     av_bprint_init(&args, 0, 1);
 752     av_bprintf(&args,
 753              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 754              "pixel_aspect=%d/%d:sws_param=flags=%d",
 755              ifilter->width, ifilter->height, ifilter->format,
 756              tb.num, tb.den, sar.num, sar.den,
 757              SWS_BILINEAR + ((ist->dec_ctx->flags&AV_CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 758     if (fr.num && fr.den)
 759         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 760     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 761              ist->file_index, ist->st->index);
 762
 763
 764     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 765                                             args.str, NULL, fg->graph)) < 0)
 766         goto fail;
 767     par->hw_frames_ctx = ifilter->hw_frames_ctx;
 768     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 769     if (ret < 0)
 770         goto fail;
 771     av_freep(&par);
 772     last_filter = ifilter->filter;
 773
 774     if (ist->autorotate) {
 775         double theta = get_rotation(ist->st);
 776
 777         if (fabs(theta - 90) < 1.0) {
 778             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
 779         } else if (fabs(theta - 180) < 1.0) {
 780             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 781             if (ret < 0)
 782                 return ret;
 783             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 784         } else if (fabs(theta - 270) < 1.0) {
 785             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
 786         } else if (fabs(theta) > 1.0) {
 787             char rotate_buf[64];
 788             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
 789             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
 790         }
 791         if (ret < 0)
 792             return ret;
 793     }
 794
 795     if (ist->framerate.num) {
 796         AVFilterContext *setpts;
 797
 798         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 799                  ist->file_index, ist->st->index);
 800         if ((ret = avfilter_graph_create_filter(&setpts,
 801                                                 avfilter_get_by_name("setpts"),
 802                                                 name, "N", NULL,
 803                                                 fg->graph)) < 0)
 804             return ret;
 805
 806         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 807             return ret;
 808
 809         last_filter = setpts;
 810     }
 811
 812     if (do_deinterlace) {
 813         AVFilterContext *yadif;
 814
 815         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 816                  ist->file_index, ist->st->index);
 817         if ((ret = avfilter_graph_create_filter(&yadif,
 818                                                 avfilter_get_by_name("yadif"),
 819                                                 name, "", NULL,
 820                                                 fg->graph)) < 0)
 821             return ret;
 822
 823         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 824             return ret;
 825
 826         last_filter = yadif;
 827     }
 828
 829     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 830              ist->file_index, ist->st->index);
 831     if (copy_ts) {
 832         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 833         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 834             tsoffset += f->ctx->start_time;
 835     }
 836     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 837                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 838                       &last_filter, &pad_idx, name);
 839     if (ret < 0)
 840         return ret;
 841
 842     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 843         return ret;
 844     return 0;
 845 fail:
 846     av_freep(&par);
 847
 848     return ret;
 849 }
 850
 851 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 852                                         AVFilterInOut *in)
 853 {
 854     AVFilterContext *last_filter;
 855     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 856     InputStream *ist = ifilter->ist;
 857     InputFile     *f = input_files[ist->file_index];
 858     AVBPrint args;
 859     char name[255];
 860     int ret, pad_idx = 0;
 861     int64_t tsoffset = 0;
 862
 863     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
 864         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 865         return AVERROR(EINVAL);
 866     }
 867
 868     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 869     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 870              1, ifilter->sample_rate,
 871              ifilter->sample_rate,
 872              av_get_sample_fmt_name(ifilter->format));
 873     if (ifilter->channel_layout)
 874         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 875                    ifilter->channel_layout);
 876     else
 877         av_bprintf(&args, ":channels=%d", ifilter->channels);
 878     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 879              ist->file_index, ist->st->index);
 880
 881     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 882                                             name, args.str, NULL,
 883                                             fg->graph)) < 0)
 884         return ret;
 885     last_filter = ifilter->filter;
 886
 887 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 888     AVFilterContext *filt_ctx;                                              \
 889                                                                             \
 890     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 891            "similarly to -af " filter_name "=%s.\n", arg);                  \
 892                                                                             \
 893     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 894                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 895     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 896                                        avfilter_get_by_name(filter_name),   \
 897                                        name, arg, NULL, fg->graph);         \
 898     if (ret < 0)                                                            \
 899         return ret;                                                         \
 900                                                                             \
 901     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 902     if (ret < 0)                                                            \
 903         return ret;                                                         \
 904                                                                             \
 905     last_filter = filt_ctx;                                                 \
 906 } while (0)
 907
 908     if (audio_sync_method > 0) {
 909         char args[256] = {0};
 910
 911         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 912         if (audio_drift_threshold != 0.1)
 913             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 914         if (!fg->reconfiguration)
 915             av_strlcatf(args, sizeof(args), ":first_pts=0");
 916         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 917     }
 918
 919 //     if (ost->audio_channels_mapped) {
 920 //         int i;
 921 //         AVBPrint pan_buf;
 922 //         av_bprint_init(&pan_buf, 256, 8192);
 923 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 924 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 925 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 926 //             if (ost->audio_channels_map[i] != -1)
 927 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 928 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 929 //         av_bprint_finalize(&pan_buf, NULL);
 930 //     }
 931
 932     if (audio_volume != 256) {
 933         char args[256];
 934
 935         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 936                "audio filter instead.\n");
 937
 938         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 939         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 940     }
 941
 942     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 943              ist->file_index, ist->st->index);
 944     if (copy_ts) {
 945         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 946         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 947             tsoffset += f->ctx->start_time;
 948     }
 949     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 950                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 951                       &last_filter, &pad_idx, name);
 952     if (ret < 0)
 953         return ret;
 954
 955     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 956         return ret;
 957
 958     return 0;
 959 }
 960
 961 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 962                                   AVFilterInOut *in)
 963 {
 964     av_freep(&ifilter->name);
 965     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 966
 967     if (!ifilter->ist->dec) {
 968         av_log(NULL, AV_LOG_ERROR,
 969                "No decoder for stream #%d:%d, filtering impossible\n",
 970                ifilter->ist->file_index, ifilter->ist->st->index);
 971         return AVERROR_DECODER_NOT_FOUND;
 972     }
 973     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 974     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 975     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 976     default: av_assert0(0);
 977     }
 978 }
 979
 980 int configure_filtergraph(FilterGraph *fg)
 981 {
 982     AVFilterInOut *inputs, *outputs, *cur;
 983     int ret, i, simple = filtergraph_is_simple(fg);
 984     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 985                                       fg->graph_desc;
 986
 987     avfilter_graph_free(&fg->graph);
 988     if (!(fg->graph = avfilter_graph_alloc()))
 989         return AVERROR(ENOMEM);
 990
 991     if (simple) {
 992         OutputStream *ost = fg->outputs[0]->ost;
 993         char args[512];
 994         AVDictionaryEntry *e = NULL;
 995
 996         fg->graph->nb_threads = filter_complex_nbthreads;
 997
 998         args[0] = 0;
 999         while ((e = av_dict_get(ost->sws_dict, "", e,
1000                                 AV_DICT_IGNORE_SUFFIX))) {
1001             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1002         }
1003         if (strlen(args))
1004             args[strlen(args)-1] = 0;
1005         fg->graph->scale_sws_opts = av_strdup(args);
1006
1007         args[0] = 0;
1008         while ((e = av_dict_get(ost->swr_opts, "", e,
1009                                 AV_DICT_IGNORE_SUFFIX))) {
1010             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1011         }
1012         if (strlen(args))
1013             args[strlen(args)-1] = 0;
1014         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
1015
1016         args[0] = '\0';
1017         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
1018                                 AV_DICT_IGNORE_SUFFIX))) {
1019             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
1020         }
1021         if (strlen(args))
1022             args[strlen(args) - 1] = '\0';
1023         fg->graph->resample_lavr_opts = av_strdup(args);
1024
1025         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1026         if (e)
1027             av_opt_set(fg->graph, "threads", e->value, 0);
1028     } else {
1029         fg->graph->nb_threads = filter_nbthreads;
1030     }
1031
1032     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1033         return ret;
1034
1035     if (hw_device_ctx) {
1036         for (i = 0; i < fg->graph->nb_filters; i++) {
1037             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
1038         }
1039     }
1040
1041     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1042         const char *num_inputs;
1043         const char *num_outputs;
1044         if (!outputs) {
1045             num_outputs = "0";
1046         } else if (outputs->next) {
1047             num_outputs = ">1";
1048         } else {
1049             num_outputs = "1";
1050         }
1051         if (!inputs) {
1052             num_inputs = "0";
1053         } else if (inputs->next) {
1054             num_inputs = ">1";
1055         } else {
1056             num_inputs = "1";
1057         }
1058         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1059                "to have exactly 1 input and 1 output."
1060                " However, it had %s input(s) and %s output(s)."
1061                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1062                graph_desc, num_inputs, num_outputs);
1063         return AVERROR(EINVAL);
1064     }
1065
1066     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1067         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1068             avfilter_inout_free(&inputs);
1069             avfilter_inout_free(&outputs);
1070             return ret;
1071         }
1072     avfilter_inout_free(&inputs);
1073
1074     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1075         configure_output_filter(fg, fg->outputs[i], cur);
1076     avfilter_inout_free(&outputs);
1077
1078     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1079         return ret;
1080
1081     /* limit the lists of allowed formats to the ones selected, to
1082      * make sure they stay the same if the filtergraph is reconfigured later */
1083     for (i = 0; i < fg->nb_outputs; i++) {
1084         OutputFilter *ofilter = fg->outputs[i];
1085         AVFilterLink *link = ofilter->filter->inputs[0];
1086
1087         ofilter->format = link->format;
1088
1089         ofilter->width  = link->w;
1090         ofilter->height = link->h;
1091
1092         ofilter->sample_rate    = link->sample_rate;
1093         ofilter->channel_layout = link->channel_layout;
1094     }
1095
1096     fg->reconfiguration = 1;
1097
1098     for (i = 0; i < fg->nb_outputs; i++) {
1099         OutputStream *ost = fg->outputs[i]->ost;
1100         if (!ost->enc) {
1101             /* identical to the same check in ffmpeg.c, needed because
1102                complex filter graphs are initialized earlier */
1103             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1104                      avcodec_get_name(ost->st->codecpar->codec_id), ost->file_index, ost->index);
1105             return AVERROR(EINVAL);
1106         }
1107         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1108             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1109             av_buffersink_set_frame_size(ost->filter->filter,
1110                                          ost->enc_ctx->frame_size);
1111     }
1112
1113     return 0;
1114 }
1115
1116 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
1117 {
1118     av_buffer_unref(&ifilter->hw_frames_ctx);
1119
1120     ifilter->format = frame->format;
1121
1122     ifilter->width               = frame->width;
1123     ifilter->height              = frame->height;
1124     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
1125
1126     ifilter->sample_rate         = frame->sample_rate;
1127     ifilter->channels            = av_frame_get_channels(frame);
1128     ifilter->channel_layout      = frame->channel_layout;
1129
1130     if (frame->hw_frames_ctx) {
1131         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
1132         if (!ifilter->hw_frames_ctx)
1133             return AVERROR(ENOMEM);
1134     }
1135
1136     return 0;
1137 }
1138
1139 int ifilter_parameters_from_decoder(InputFilter *ifilter, const AVCodecContext *avctx)
1140 {
1141     av_buffer_unref(&ifilter->hw_frames_ctx);
1142
1143     if (avctx->codec_type == AVMEDIA_TYPE_VIDEO)
1144         ifilter->format = avctx->pix_fmt;
1145     else
1146         ifilter->format = avctx->sample_fmt;
1147
1148     ifilter->width               = avctx->width;
1149     ifilter->height              = avctx->height;
1150     if (ifilter->ist && ifilter->ist->st && ifilter->ist->st->sample_aspect_ratio.num)
1151         ifilter->sample_aspect_ratio = ifilter->ist->st->sample_aspect_ratio;
1152     else
1153         ifilter->sample_aspect_ratio = avctx->sample_aspect_ratio;
1154
1155     ifilter->sample_rate         = avctx->sample_rate;
1156     ifilter->channels            = avctx->channels;
1157     ifilter->channel_layout      = avctx->channel_layout;
1158
1159     if (ifilter->ist && ifilter->ist->hw_frames_ctx) {
1160         ifilter->format = ifilter->ist->resample_pix_fmt;
1161         ifilter->hw_frames_ctx = av_buffer_ref(ifilter->ist->hw_frames_ctx);
1162         if (!ifilter->hw_frames_ctx)
1163             return AVERROR(ENOMEM);
1164     }
1165
1166     return 0;
1167 }
1168
1169 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1170 {
1171     int i;
1172     for (i = 0; i < fg->nb_inputs; i++)
1173         if (fg->inputs[i]->ist == ist)
1174             return 1;
1175     return 0;
1176 }
1177
1178 int filtergraph_is_simple(FilterGraph *fg)
1179 {
1180     return !fg->graph_desc;
1181 }