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