avconv_filter.c

   1 /*
   2  * avconv filter configuration
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav 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  * Libav 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 Libav; 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 "avconv.h"
  24
  25 #include "libavfilter/avfilter.h"
  26
  27 #include "libavresample/avresample.h"
  28
  29 #include "libavutil/avassert.h"
  30 #include "libavutil/avstring.h"
  31 #include "libavutil/channel_layout.h"
  32 #include "libavutil/display.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/pixdesc.h"
  35 #include "libavutil/pixfmt.h"
  36 #include "libavutil/samplefmt.h"
  37
  38 /* Define a function for building a string containing a list of
  39  * allowed formats. */
  40 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
  41 static char *choose_ ## var ## s(OutputStream *ost)                            \
  42 {                                                                              \
  43     if (ost->enc_ctx->var != none) {                                           \
  44         get_name(ost->enc_ctx->var);                                           \
  45         return av_strdup(name);                                                \
  46     } else if (ost->enc && ost->enc->supported_list) {                         \
  47         const type *p;                                                         \
  48         AVIOContext *s = NULL;                                                 \
  49         uint8_t *ret;                                                          \
  50         int len;                                                               \
  51                                                                                \
  52         if (avio_open_dyn_buf(&s) < 0)                                         \
  53             exit(1);                                                           \
  54                                                                                \
  55         for (p = ost->enc->supported_list; *p != none; p++) {                  \
  56             get_name(*p);                                                      \
  57             avio_printf(s, "%s|", name);                                       \
  58         }                                                                      \
  59         len = avio_close_dyn_buf(s, &ret);                                     \
  60         ret[len - 1] = 0;                                                      \
  61         return ret;                                                            \
  62     } else                                                                     \
  63         return NULL;                                                           \
  64 }
  65
  66 DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
  67                   GET_PIX_FMT_NAME)
  68
  69 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
  70                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
  71
  72 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
  73                   GET_SAMPLE_RATE_NAME)
  74
  75 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
  76                   GET_CH_LAYOUT_NAME)
  77
  78 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
  79 {
  80     FilterGraph *fg = av_mallocz(sizeof(*fg));
  81
  82     if (!fg)
  83         exit(1);
  84     fg->index = nb_filtergraphs;
  85
  86     GROW_ARRAY(fg->outputs, fg->nb_outputs);
  87     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
  88         exit(1);
  89     fg->outputs[0]->ost   = ost;
  90     fg->outputs[0]->graph = fg;
  91
  92     ost->filter = fg->outputs[0];
  93
  94     GROW_ARRAY(fg->inputs, fg->nb_inputs);
  95     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
  96         exit(1);
  97     fg->inputs[0]->ist   = ist;
  98     fg->inputs[0]->graph = fg;
  99
 100     GROW_ARRAY(ist->filters, ist->nb_filters);
 101     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 102
 103     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 104     filtergraphs[nb_filtergraphs - 1] = fg;
 105
 106     return fg;
 107 }
 108
 109 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 110 {
 111     InputStream *ist = NULL;
 112     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 113     int i;
 114
 115     // TODO: support other filter types
 116     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 117         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 118                "currently.\n");
 119         exit(1);
 120     }
 121
 122     if (in->name) {
 123         AVFormatContext *s;
 124         AVStream       *st = NULL;
 125         char *p;
 126         int file_idx = strtol(in->name, &p, 0);
 127
 128         if (file_idx < 0 || file_idx >= nb_input_files) {
 129             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
 130                    file_idx, fg->graph_desc);
 131             exit(1);
 132         }
 133         s = input_files[file_idx]->ctx;
 134
 135         for (i = 0; i < s->nb_streams; i++) {
 136             if (s->streams[i]->codec->codec_type != type)
 137                 continue;
 138             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 139                 st = s->streams[i];
 140                 break;
 141             }
 142         }
 143         if (!st) {
 144             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 145                    "matches no streams.\n", p, fg->graph_desc);
 146             exit(1);
 147         }
 148         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 149     } else {
 150         /* find the first unused stream of corresponding type */
 151         for (i = 0; i < nb_input_streams; i++) {
 152             ist = input_streams[i];
 153             if (ist->dec_ctx->codec_type == type && ist->discard)
 154                 break;
 155         }
 156         if (i == nb_input_streams) {
 157             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 158                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 159                    in->filter_ctx->name);
 160             exit(1);
 161         }
 162     }
 163     av_assert0(ist);
 164
 165     ist->discard         = 0;
 166     ist->decoding_needed = 1;
 167     ist->st->discard = AVDISCARD_NONE;
 168
 169     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 170     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 171         exit(1);
 172     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 173     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 174
 175     GROW_ARRAY(ist->filters, ist->nb_filters);
 176     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 177 }
 178
 179 int init_complex_filtergraph(FilterGraph *fg)
 180 {
 181     AVFilterInOut *inputs, *outputs, *cur;
 182     AVFilterGraph *graph;
 183     int ret = 0;
 184
 185     /* this graph is only used for determining the kinds of inputs
 186      * and outputs we have, and is discarded on exit from this function */
 187     graph = avfilter_graph_alloc();
 188     if (!graph)
 189         return AVERROR(ENOMEM);
 190
 191     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 192     if (ret < 0)
 193         goto fail;
 194
 195     for (cur = inputs; cur; cur = cur->next)
 196         init_input_filter(fg, cur);
 197
 198     for (cur = outputs; cur;) {
 199         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 200         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 201         if (!fg->outputs[fg->nb_outputs - 1])
 202             exit(1);
 203
 204         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 205         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 206         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 207                                                                          cur->pad_idx);
 208         cur = cur->next;
 209         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 210     }
 211
 212 fail:
 213     avfilter_inout_free(&inputs);
 214     avfilter_graph_free(&graph);
 215     return ret;
 216 }
 217
 218 static int insert_trim(int64_t start_time, int64_t duration,
 219                        AVFilterContext **last_filter, int *pad_idx,
 220                        const char *filter_name)
 221 {
 222     AVFilterGraph *graph = (*last_filter)->graph;
 223     AVFilterContext *ctx;
 224     const AVFilter *trim;
 225     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 226     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 227     int ret = 0;
 228
 229     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 230         return 0;
 231
 232     trim = avfilter_get_by_name(name);
 233     if (!trim) {
 234         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 235                "recording time.\n", name);
 236         return AVERROR_FILTER_NOT_FOUND;
 237     }
 238
 239     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 240     if (!ctx)
 241         return AVERROR(ENOMEM);
 242
 243     if (duration != INT64_MAX) {
 244         ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
 245                                 AV_OPT_SEARCH_CHILDREN);
 246     }
 247     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 248         ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
 249                                 AV_OPT_SEARCH_CHILDREN);
 250     }
 251     if (ret < 0) {
 252         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 253         return ret;
 254     }
 255
 256     ret = avfilter_init_str(ctx, NULL);
 257     if (ret < 0)
 258         return ret;
 259
 260     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 261     if (ret < 0)
 262         return ret;
 263
 264     *last_filter = ctx;
 265     *pad_idx     = 0;
 266     return 0;
 267 }
 268
 269 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 270                          const char *filter_name, const char *args)
 271 {
 272     AVFilterGraph *graph = (*last_filter)->graph;
 273     AVFilterContext *ctx;
 274     int ret;
 275
 276     ret = avfilter_graph_create_filter(&ctx,
 277                                        avfilter_get_by_name(filter_name),
 278                                        filter_name, args, NULL, graph);
 279     if (ret < 0)
 280         return ret;
 281
 282     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 283     if (ret < 0)
 284         return ret;
 285
 286     *last_filter = ctx;
 287     *pad_idx     = 0;
 288     return 0;
 289 }
 290
 291 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 292 {
 293     char *pix_fmts;
 294     OutputStream *ost = ofilter->ost;
 295     OutputFile    *of = output_files[ost->file_index];
 296     AVCodecContext *codec = ost->enc_ctx;
 297     AVFilterContext *last_filter = out->filter_ctx;
 298     int pad_idx = out->pad_idx;
 299     int ret;
 300     char name[255];
 301
 302     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 303     ret = avfilter_graph_create_filter(&ofilter->filter,
 304                                        avfilter_get_by_name("buffersink"),
 305                                        name, NULL, NULL, fg->graph);
 306     if (ret < 0)
 307         return ret;
 308
 309     if (codec->width || codec->height) {
 310         char args[255];
 311         AVFilterContext *filter;
 312
 313         snprintf(args, sizeof(args), "%d:%d:0x%X",
 314                  codec->width,
 315                  codec->height,
 316                  (unsigned)ost->sws_flags);
 317         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 318                  ost->file_index, ost->index);
 319         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 320                                                 name, args, NULL, fg->graph)) < 0)
 321             return ret;
 322         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 323             return ret;
 324
 325         last_filter = filter;
 326         pad_idx = 0;
 327     }
 328
 329     if ((pix_fmts = choose_pix_fmts(ost))) {
 330         AVFilterContext *filter;
 331         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 332                  ost->file_index, ost->index);
 333         ret = avfilter_graph_create_filter(&filter,
 334                                            avfilter_get_by_name("format"),
 335                                            "format", pix_fmts, NULL, fg->graph);
 336         av_freep(&pix_fmts);
 337         if (ret < 0)
 338             return ret;
 339         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 340             return ret;
 341
 342         last_filter = filter;
 343         pad_idx     = 0;
 344     }
 345
 346     if (ost->frame_rate.num) {
 347         AVFilterContext *fps;
 348         char args[255];
 349
 350         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 351                  ost->frame_rate.den);
 352         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 353                  ost->file_index, ost->index);
 354         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 355                                            name, args, NULL, fg->graph);
 356         if (ret < 0)
 357             return ret;
 358
 359         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 360         if (ret < 0)
 361             return ret;
 362         last_filter = fps;
 363         pad_idx = 0;
 364     }
 365
 366     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 367              ost->file_index, ost->index);
 368     ret = insert_trim(of->start_time, of->recording_time,
 369                       &last_filter, &pad_idx, name);
 370     if (ret < 0)
 371         return ret;
 372
 373
 374     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 375         return ret;
 376
 377     return 0;
 378 }
 379
 380 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 381 {
 382     OutputStream *ost = ofilter->ost;
 383     OutputFile    *of = output_files[ost->file_index];
 384     AVCodecContext *codec  = ost->enc_ctx;
 385     AVFilterContext *last_filter = out->filter_ctx;
 386     int pad_idx = out->pad_idx;
 387     char *sample_fmts, *sample_rates, *channel_layouts;
 388     char name[255];
 389     int ret;
 390
 391
 392     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 393     ret = avfilter_graph_create_filter(&ofilter->filter,
 394                                        avfilter_get_by_name("abuffersink"),
 395                                        name, NULL, NULL, fg->graph);
 396     if (ret < 0)
 397         return ret;
 398
 399     if (codec->channels && !codec->channel_layout)
 400         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 401
 402     sample_fmts     = choose_sample_fmts(ost);
 403     sample_rates    = choose_sample_rates(ost);
 404     channel_layouts = choose_channel_layouts(ost);
 405     if (sample_fmts || sample_rates || channel_layouts) {
 406         AVFilterContext *format;
 407         char args[256];
 408         int len = 0;
 409
 410         if (sample_fmts)
 411             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
 412                             sample_fmts);
 413         if (sample_rates)
 414             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
 415                             sample_rates);
 416         if (channel_layouts)
 417             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
 418                             channel_layouts);
 419         args[len - 1] = 0;
 420
 421         av_freep(&sample_fmts);
 422         av_freep(&sample_rates);
 423         av_freep(&channel_layouts);
 424
 425         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 426                  ost->file_index, ost->index);
 427         ret = avfilter_graph_create_filter(&format,
 428                                            avfilter_get_by_name("aformat"),
 429                                            name, args, NULL, fg->graph);
 430         if (ret < 0)
 431             return ret;
 432
 433         ret = avfilter_link(last_filter, pad_idx, format, 0);
 434         if (ret < 0)
 435             return ret;
 436
 437         last_filter = format;
 438         pad_idx = 0;
 439     }
 440
 441     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 442              ost->file_index, ost->index);
 443     ret = insert_trim(of->start_time, of->recording_time,
 444                       &last_filter, &pad_idx, name);
 445     if (ret < 0)
 446         return ret;
 447
 448     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 449         return ret;
 450
 451     return 0;
 452 }
 453
 454 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 455 {                                                                  \
 456     AVFilterContext *ctx = inout->filter_ctx;                      \
 457     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 458     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 459     AVIOContext *pb;                                               \
 460                                                                    \
 461     if (avio_open_dyn_buf(&pb) < 0)                                \
 462         exit(1);                                                   \
 463                                                                    \
 464     avio_printf(pb, "%s", ctx->filter->name);                      \
 465     if (nb_pads > 1)                                               \
 466         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 467     avio_w8(pb, 0);                                                \
 468     avio_close_dyn_buf(pb, &f->name);                              \
 469 }
 470
 471 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 472 {
 473     av_freep(&ofilter->name);
 474     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 475
 476     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 477     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 478     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 479     default: av_assert0(0);
 480     }
 481 }
 482
 483 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 484                                         AVFilterInOut *in)
 485 {
 486     AVFilterContext *last_filter;
 487     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 488     InputStream *ist = ifilter->ist;
 489     InputFile     *f = input_files[ist->file_index];
 490     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 491                                          ist->st->time_base;
 492     AVRational sar;
 493     char args[255], name[255];
 494     int ret, pad_idx = 0;
 495
 496     sar = ist->st->sample_aspect_ratio.num ?
 497           ist->st->sample_aspect_ratio :
 498           ist->dec_ctx->sample_aspect_ratio;
 499     snprintf(args, sizeof(args),
 500              "width=%d:height=%d:pix_fmt=%d:time_base=%d/%d:sar=%d/%d",
 501              ist->dec_ctx->width, ist->dec_ctx->height,
 502              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->dec_ctx->pix_fmt,
 503              tb.num, tb.den, sar.num, sar.den);
 504     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 505              ist->file_index, ist->st->index);
 506
 507     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 508                                             args, NULL, fg->graph)) < 0)
 509         return ret;
 510     last_filter = ifilter->filter;
 511
 512     if (ist->autorotate) {
 513         uint8_t* displaymatrix = av_stream_get_side_data(ist->st,
 514                                                          AV_PKT_DATA_DISPLAYMATRIX, NULL);
 515         if (displaymatrix) {
 516             double rot = av_display_rotation_get((int32_t*) displaymatrix);
 517             if (rot < -135 || rot > 135) {
 518                 ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 519                 if (ret < 0)
 520                     return ret;
 521                 ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 522             } else if (rot < -45) {
 523                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=clock");
 524             } else if (rot > 45) {
 525                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=cclock");
 526             }
 527             if (ret < 0)
 528                 return ret;
 529         }
 530     }
 531
 532     if (ist->framerate.num) {
 533         AVFilterContext *setpts;
 534
 535         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 536                  ist->file_index, ist->st->index);
 537         if ((ret = avfilter_graph_create_filter(&setpts,
 538                                                 avfilter_get_by_name("setpts"),
 539                                                 name, "N", NULL,
 540                                                 fg->graph)) < 0)
 541             return ret;
 542
 543         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 544             return ret;
 545
 546         last_filter = setpts;
 547     }
 548
 549     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 550              ist->file_index, ist->st->index);
 551     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 552                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 553     if (ret < 0)
 554         return ret;
 555
 556     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 557         return ret;
 558     return 0;
 559 }
 560
 561 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 562                                         AVFilterInOut *in)
 563 {
 564     AVFilterContext *last_filter;
 565     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 566     InputStream *ist = ifilter->ist;
 567     InputFile     *f = input_files[ist->file_index];
 568     char args[255], name[255];
 569     int ret, pad_idx = 0;
 570
 571     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
 572              ":channel_layout=0x%"PRIx64,
 573              1, ist->dec_ctx->sample_rate,
 574              ist->dec_ctx->sample_rate,
 575              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt),
 576              ist->dec_ctx->channel_layout);
 577     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 578              ist->file_index, ist->st->index);
 579
 580     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 581                                             name, args, NULL,
 582                                             fg->graph)) < 0)
 583         return ret;
 584     last_filter = ifilter->filter;
 585
 586     if (audio_sync_method > 0) {
 587         AVFilterContext *async;
 588         int  len = 0;
 589
 590         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
 591                "asyncts audio filter instead.\n");
 592
 593         if (audio_sync_method > 1)
 594             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
 595                             "max_comp=%d:", audio_sync_method);
 596         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
 597                  audio_drift_threshold);
 598
 599         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
 600                  fg->index, ist->file_index, ist->st->index);
 601         ret = avfilter_graph_create_filter(&async,
 602                                            avfilter_get_by_name("asyncts"),
 603                                            name, args, NULL, fg->graph);
 604         if (ret < 0)
 605             return ret;
 606
 607         ret = avfilter_link(last_filter, 0, async, 0);
 608         if (ret < 0)
 609             return ret;
 610
 611         last_filter = async;
 612     }
 613     if (audio_volume != 256) {
 614         AVFilterContext *volume;
 615
 616         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 617                "audio filter instead.\n");
 618
 619         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
 620
 621         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
 622                  fg->index, ist->file_index, ist->st->index);
 623         ret = avfilter_graph_create_filter(&volume,
 624                                            avfilter_get_by_name("volume"),
 625                                            name, args, NULL, fg->graph);
 626         if (ret < 0)
 627             return ret;
 628
 629         ret = avfilter_link(last_filter, 0, volume, 0);
 630         if (ret < 0)
 631             return ret;
 632
 633         last_filter = volume;
 634     }
 635
 636     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 637              ist->file_index, ist->st->index);
 638     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 639                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 640     if (ret < 0)
 641         return ret;
 642
 643     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 644         return ret;
 645
 646     return 0;
 647 }
 648
 649 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 650                                   AVFilterInOut *in)
 651 {
 652     av_freep(&ifilter->name);
 653     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 654
 655     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 656     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 657     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 658     default: av_assert0(0);
 659     }
 660 }
 661
 662 int configure_filtergraph(FilterGraph *fg)
 663 {
 664     AVFilterInOut *inputs, *outputs, *cur;
 665     int ret, i, simple = !fg->graph_desc;
 666     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 667                                       fg->graph_desc;
 668
 669     avfilter_graph_free(&fg->graph);
 670     if (!(fg->graph = avfilter_graph_alloc()))
 671         return AVERROR(ENOMEM);
 672
 673     if (simple) {
 674         OutputStream *ost = fg->outputs[0]->ost;
 675         char args[512];
 676         AVDictionaryEntry *e = NULL;
 677
 678         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 679         fg->graph->scale_sws_opts = av_strdup(args);
 680
 681         args[0] = '\0';
 682         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 683                                 AV_DICT_IGNORE_SUFFIX))) {
 684             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 685         }
 686         if (strlen(args))
 687             args[strlen(args) - 1] = '\0';
 688         fg->graph->resample_lavr_opts = av_strdup(args);
 689     }
 690
 691     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 692         return ret;
 693
 694     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 695         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 696                "exactly one input and output.\n", graph_desc);
 697         return AVERROR(EINVAL);
 698     }
 699
 700     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 701         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 702             return ret;
 703     avfilter_inout_free(&inputs);
 704
 705     for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
 706         OutputFilter *ofilter = fg->outputs[i];
 707         if (ofilter->ost)
 708             configure_output_filter(fg, ofilter, cur);
 709     }
 710
 711     avfilter_inout_free(&outputs);
 712
 713     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 714         return ret;
 715
 716     return 0;
 717 }
 718
 719 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 720 {
 721     int i;
 722     for (i = 0; i < fg->nb_inputs; i++)
 723         if (fg->inputs[i]->ist == ist)
 724             return 1;
 725     return 0;
 726 }
 727