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