git.sesse.net Git - ffmpeg/blob - 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 #include "libavfilter/buffersrc.h"
  27
  28 #include "libavresample/avresample.h"
  29
  30 #include "libavutil/avassert.h"
  31 #include "libavutil/avstring.h"
  32 #include "libavutil/channel_layout.h"
  33 #include "libavutil/display.h"
  34 #include "libavutil/opt.h"
  35 #include "libavutil/pixdesc.h"
  36 #include "libavutil/pixfmt.h"
  37 #include "libavutil/samplefmt.h"
  38
  39 /* Define a function for building a string containing a list of
  40  * allowed formats. */
  41 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
  42 static char *choose_ ## var ## s(OutputStream *ost)                            \
  43 {                                                                              \
  44     if (ost->enc_ctx->var != none) {                                           \
  45         get_name(ost->enc_ctx->var);                                           \
  46         return av_strdup(name);                                                \
  47     } else if (ost->enc && ost->enc->supported_list) {                         \
  48         const type *p;                                                         \
  49         AVIOContext *s = NULL;                                                 \
  50         uint8_t *ret;                                                          \
  51         int len;                                                               \
  52                                                                                \
  53         if (avio_open_dyn_buf(&s) < 0)                                         \
  54             exit(1);                                                           \
  55                                                                                \
  56         for (p = ost->enc->supported_list; *p != none; p++) {                  \
  57             get_name(*p);                                                      \
  58             avio_printf(s, "%s|", name);                                       \
  59         }                                                                      \
  60         len = avio_close_dyn_buf(s, &ret);                                     \
  61         ret[len - 1] = 0;                                                      \
  62         return ret;                                                            \
  63     } else                                                                     \
  64         return NULL;                                                           \
  65 }
  66
  67 DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
  68                   GET_PIX_FMT_NAME)
  69
  70 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
  71                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
  72
  73 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
  74                   GET_SAMPLE_RATE_NAME)
  75
  76 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
  77                   GET_CH_LAYOUT_NAME)
  78
  79 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
  80 {
  81     FilterGraph *fg = av_mallocz(sizeof(*fg));
  82
  83     if (!fg)
  84         exit(1);
  85     fg->index = nb_filtergraphs;
  86
  87     GROW_ARRAY(fg->outputs, fg->nb_outputs);
  88     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
  89         exit(1);
  90     fg->outputs[0]->ost   = ost;
  91     fg->outputs[0]->graph = fg;
  92
  93     ost->filter = fg->outputs[0];
  94
  95     GROW_ARRAY(fg->inputs, fg->nb_inputs);
  96     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
  97         exit(1);
  98     fg->inputs[0]->ist   = ist;
  99     fg->inputs[0]->graph = fg;
 100
 101     GROW_ARRAY(ist->filters, ist->nb_filters);
 102     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 103
 104     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 105     filtergraphs[nb_filtergraphs - 1] = fg;
 106
 107     return fg;
 108 }
 109
 110 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 111 {
 112     InputStream *ist = NULL;
 113     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 114     int i;
 115
 116     // TODO: support other filter types
 117     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 118         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 119                "currently.\n");
 120         exit(1);
 121     }
 122
 123     if (in->name) {
 124         AVFormatContext *s;
 125         AVStream       *st = NULL;
 126         char *p;
 127         int file_idx = strtol(in->name, &p, 0);
 128
 129         if (file_idx < 0 || file_idx >= nb_input_files) {
 130             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
 131                    file_idx, fg->graph_desc);
 132             exit(1);
 133         }
 134         s = input_files[file_idx]->ctx;
 135
 136         for (i = 0; i < s->nb_streams; i++) {
 137             if (s->streams[i]->codecpar->codec_type != type)
 138                 continue;
 139             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 140                 st = s->streams[i];
 141                 break;
 142             }
 143         }
 144         if (!st) {
 145             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 146                    "matches no streams.\n", p, fg->graph_desc);
 147             exit(1);
 148         }
 149         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 150     } else {
 151         /* find the first unused stream of corresponding type */
 152         for (i = 0; i < nb_input_streams; i++) {
 153             ist = input_streams[i];
 154             if (ist->dec_ctx->codec_type == type && ist->discard)
 155                 break;
 156         }
 157         if (i == nb_input_streams) {
 158             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 159                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 160                    in->filter_ctx->name);
 161             exit(1);
 162         }
 163     }
 164     av_assert0(ist);
 165
 166     ist->discard         = 0;
 167     ist->decoding_needed = 1;
 168     ist->st->discard = AVDISCARD_NONE;
 169
 170     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 171     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 172         exit(1);
 173     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 174     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 175
 176     GROW_ARRAY(ist->filters, ist->nb_filters);
 177     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 178 }
 179
 180 int init_complex_filtergraph(FilterGraph *fg)
 181 {
 182     AVFilterInOut *inputs, *outputs, *cur;
 183     AVFilterGraph *graph;
 184     int ret = 0;
 185
 186     /* this graph is only used for determining the kinds of inputs
 187      * and outputs we have, and is discarded on exit from this function */
 188     graph = avfilter_graph_alloc();
 189     if (!graph)
 190         return AVERROR(ENOMEM);
 191
 192     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 193     if (ret < 0)
 194         goto fail;
 195
 196     for (cur = inputs; cur; cur = cur->next)
 197         init_input_filter(fg, cur);
 198
 199     for (cur = outputs; cur;) {
 200         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 201         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 202         if (!fg->outputs[fg->nb_outputs - 1])
 203             exit(1);
 204
 205         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 206         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 207         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 208                                                                          cur->pad_idx);
 209         cur = cur->next;
 210         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 211     }
 212
 213 fail:
 214     avfilter_inout_free(&inputs);
 215     avfilter_graph_free(&graph);
 216     return ret;
 217 }
 218
 219 static int insert_trim(int64_t start_time, int64_t duration,
 220                        AVFilterContext **last_filter, int *pad_idx,
 221                        const char *filter_name)
 222 {
 223     AVFilterGraph *graph = (*last_filter)->graph;
 224     AVFilterContext *ctx;
 225     const AVFilter *trim;
 226     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 227     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 228     int ret = 0;
 229
 230     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 231         return 0;
 232
 233     trim = avfilter_get_by_name(name);
 234     if (!trim) {
 235         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 236                "recording time.\n", name);
 237         return AVERROR_FILTER_NOT_FOUND;
 238     }
 239
 240     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 241     if (!ctx)
 242         return AVERROR(ENOMEM);
 243
 244     if (duration != INT64_MAX) {
 245         ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
 246                                 AV_OPT_SEARCH_CHILDREN);
 247     }
 248     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 249         ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
 250                                 AV_OPT_SEARCH_CHILDREN);
 251     }
 252     if (ret < 0) {
 253         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 254         return ret;
 255     }
 256
 257     ret = avfilter_init_str(ctx, NULL);
 258     if (ret < 0)
 259         return ret;
 260
 261     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 262     if (ret < 0)
 263         return ret;
 264
 265     *last_filter = ctx;
 266     *pad_idx     = 0;
 267     return 0;
 268 }
 269
 270 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 271                          const char *filter_name, const char *args)
 272 {
 273     AVFilterGraph *graph = (*last_filter)->graph;
 274     AVFilterContext *ctx;
 275     int ret;
 276
 277     ret = avfilter_graph_create_filter(&ctx,
 278                                        avfilter_get_by_name(filter_name),
 279                                        filter_name, args, NULL, graph);
 280     if (ret < 0)
 281         return ret;
 282
 283     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 284     if (ret < 0)
 285         return ret;
 286
 287     *last_filter = ctx;
 288     *pad_idx     = 0;
 289     return 0;
 290 }
 291
 292 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 293 {
 294     char *pix_fmts;
 295     OutputStream *ost = ofilter->ost;
 296     OutputFile    *of = output_files[ost->file_index];
 297     AVCodecContext *codec = ost->enc_ctx;
 298     AVFilterContext *last_filter = out->filter_ctx;
 299     int pad_idx = out->pad_idx;
 300     int ret;
 301     char name[255];
 302
 303     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 304     ret = avfilter_graph_create_filter(&ofilter->filter,
 305                                        avfilter_get_by_name("buffersink"),
 306                                        name, NULL, NULL, fg->graph);
 307     if (ret < 0)
 308         return ret;
 309
 310     if (codec->width || codec->height) {
 311         char args[255];
 312         AVFilterContext *filter;
 313
 314         snprintf(args, sizeof(args), "%d:%d:0x%X",
 315                  codec->width,
 316                  codec->height,
 317                  (unsigned)ost->sws_flags);
 318         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 319                  ost->file_index, ost->index);
 320         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 321                                                 name, args, NULL, fg->graph)) < 0)
 322             return ret;
 323         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 324             return ret;
 325
 326         last_filter = filter;
 327         pad_idx = 0;
 328     }
 329
 330     if ((pix_fmts = choose_pix_fmts(ost))) {
 331         AVFilterContext *filter;
 332         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 333                  ost->file_index, ost->index);
 334         ret = avfilter_graph_create_filter(&filter,
 335                                            avfilter_get_by_name("format"),
 336                                            "format", pix_fmts, NULL, fg->graph);
 337         av_freep(&pix_fmts);
 338         if (ret < 0)
 339             return ret;
 340         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 341             return ret;
 342
 343         last_filter = filter;
 344         pad_idx     = 0;
 345     }
 346
 347     if (ost->frame_rate.num) {
 348         AVFilterContext *fps;
 349         char args[255];
 350
 351         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 352                  ost->frame_rate.den);
 353         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 354                  ost->file_index, ost->index);
 355         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 356                                            name, args, NULL, fg->graph);
 357         if (ret < 0)
 358             return ret;
 359
 360         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 361         if (ret < 0)
 362             return ret;
 363         last_filter = fps;
 364         pad_idx = 0;
 365     }
 366
 367     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 368              ost->file_index, ost->index);
 369     ret = insert_trim(of->start_time, of->recording_time,
 370                       &last_filter, &pad_idx, name);
 371     if (ret < 0)
 372         return ret;
 373
 374
 375     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 376         return ret;
 377
 378     return 0;
 379 }
 380
 381 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 382 {
 383     OutputStream *ost = ofilter->ost;
 384     OutputFile    *of = output_files[ost->file_index];
 385     AVCodecContext *codec  = ost->enc_ctx;
 386     AVFilterContext *last_filter = out->filter_ctx;
 387     int pad_idx = out->pad_idx;
 388     char *sample_fmts, *sample_rates, *channel_layouts;
 389     char name[255];
 390     int ret;
 391
 392
 393     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 394     ret = avfilter_graph_create_filter(&ofilter->filter,
 395                                        avfilter_get_by_name("abuffersink"),
 396                                        name, NULL, NULL, fg->graph);
 397     if (ret < 0)
 398         return ret;
 399
 400     if (codec->channels && !codec->channel_layout)
 401         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 402
 403     sample_fmts     = choose_sample_fmts(ost);
 404     sample_rates    = choose_sample_rates(ost);
 405     channel_layouts = choose_channel_layouts(ost);
 406     if (sample_fmts || sample_rates || channel_layouts) {
 407         AVFilterContext *format;
 408         char args[256];
 409         int len = 0;
 410
 411         if (sample_fmts)
 412             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
 413                             sample_fmts);
 414         if (sample_rates)
 415             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
 416                             sample_rates);
 417         if (channel_layouts)
 418             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
 419                             channel_layouts);
 420         args[len - 1] = 0;
 421
 422         av_freep(&sample_fmts);
 423         av_freep(&sample_rates);
 424         av_freep(&channel_layouts);
 425
 426         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 427                  ost->file_index, ost->index);
 428         ret = avfilter_graph_create_filter(&format,
 429                                            avfilter_get_by_name("aformat"),
 430                                            name, args, NULL, fg->graph);
 431         if (ret < 0)
 432             return ret;
 433
 434         ret = avfilter_link(last_filter, pad_idx, format, 0);
 435         if (ret < 0)
 436             return ret;
 437
 438         last_filter = format;
 439         pad_idx = 0;
 440     }
 441
 442     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 443              ost->file_index, ost->index);
 444     ret = insert_trim(of->start_time, of->recording_time,
 445                       &last_filter, &pad_idx, name);
 446     if (ret < 0)
 447         return ret;
 448
 449     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 450         return ret;
 451
 452     return 0;
 453 }
 454
 455 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 456 {                                                                  \
 457     AVFilterContext *ctx = inout->filter_ctx;                      \
 458     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 459     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 460     AVIOContext *pb;                                               \
 461                                                                    \
 462     if (avio_open_dyn_buf(&pb) < 0)                                \
 463         exit(1);                                                   \
 464                                                                    \
 465     avio_printf(pb, "%s", ctx->filter->name);                      \
 466     if (nb_pads > 1)                                               \
 467         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 468     avio_w8(pb, 0);                                                \
 469     avio_close_dyn_buf(pb, &f->name);                              \
 470 }
 471
 472 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 473 {
 474     av_freep(&ofilter->name);
 475     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 476
 477     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 478     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 479     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 480     default: av_assert0(0);
 481     }
 482 }
 483
 484 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 485                                         AVFilterInOut *in)
 486 {
 487     AVFilterContext *last_filter;
 488     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 489     InputStream *ist = ifilter->ist;
 490     InputFile     *f = input_files[ist->file_index];
 491     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 492                                          ist->st->time_base;
 493     AVBufferSrcParameters *par;
 494     char name[255];
 495     int ret, pad_idx = 0;
 496
 497     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 498              ist->file_index, ist->st->index);
 499
 500     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, buffer_filt, name);
 501     if (!ifilter->filter)
 502         return AVERROR(ENOMEM);
 503
 504     par = av_buffersrc_parameters_alloc();
 505     if (!par)
 506         return AVERROR(ENOMEM);
 507
 508     par->sample_aspect_ratio = ist->st->sample_aspect_ratio.num ?
 509                                ist->st->sample_aspect_ratio :
 510                                ist->dec_ctx->sample_aspect_ratio;
 511     par->width               = ist->dec_ctx->width;
 512     par->height              = ist->dec_ctx->height;
 513     par->format              = ist->hwaccel_retrieve_data ?
 514                                ist->hwaccel_retrieved_pix_fmt : ist->dec_ctx->pix_fmt;
 515     par->time_base           = tb;
 516
 517     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 518     av_freep(&par);
 519     if (ret < 0)
 520         return ret;
 521
 522     ret = avfilter_init_str(ifilter->filter, NULL);
 523     if (ret < 0)
 524         return ret;
 525
 526     last_filter = ifilter->filter;
 527
 528     if (ist->autorotate) {
 529         uint8_t* displaymatrix = av_stream_get_side_data(ist->st,
 530                                                          AV_PKT_DATA_DISPLAYMATRIX, NULL);
 531         if (displaymatrix) {
 532             double rot = av_display_rotation_get((int32_t*) displaymatrix);
 533             if (rot < -135 || rot > 135) {
 534                 ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 535                 if (ret < 0)
 536                     return ret;
 537                 ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 538             } else if (rot < -45) {
 539                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=clock");
 540             } else if (rot > 45) {
 541                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=cclock");
 542             }
 543             if (ret < 0)
 544                 return ret;
 545         }
 546     }
 547
 548     if (ist->framerate.num) {
 549         AVFilterContext *setpts;
 550
 551         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 552                  ist->file_index, ist->st->index);
 553         if ((ret = avfilter_graph_create_filter(&setpts,
 554                                                 avfilter_get_by_name("setpts"),
 555                                                 name, "N", NULL,
 556                                                 fg->graph)) < 0)
 557             return ret;
 558
 559         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 560             return ret;
 561
 562         last_filter = setpts;
 563     }
 564
 565     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 566              ist->file_index, ist->st->index);
 567     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 568                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 569     if (ret < 0)
 570         return ret;
 571
 572     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 573         return ret;
 574     return 0;
 575 }
 576
 577 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 578                                         AVFilterInOut *in)
 579 {
 580     AVFilterContext *last_filter;
 581     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 582     InputStream *ist = ifilter->ist;
 583     InputFile     *f = input_files[ist->file_index];
 584     AVBufferSrcParameters *par;
 585     char args[255], name[255];
 586     int ret, pad_idx = 0;
 587
 588     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 589              ist->file_index, ist->st->index);
 590
 591     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, abuffer_filt, name);
 592     if (!ifilter->filter)
 593         return AVERROR(ENOMEM);
 594
 595     par = av_buffersrc_parameters_alloc();
 596     if (!par)
 597         return AVERROR(ENOMEM);
 598
 599     par->time_base      = (AVRational){ 1, ist->dec_ctx->sample_rate };
 600     par->sample_rate    = ist->dec_ctx->sample_rate;
 601     par->format         = ist->dec_ctx->sample_fmt;
 602     par->channel_layout = ist->dec_ctx->channel_layout;
 603
 604     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 605     av_freep(&par);
 606     if (ret < 0)
 607         return ret;
 608
 609     ret = avfilter_init_str(ifilter->filter, NULL);
 610     if (ret < 0)
 611         return ret;
 612     last_filter = ifilter->filter;
 613
 614     if (audio_sync_method > 0) {
 615         AVFilterContext *async;
 616         int  len = 0;
 617
 618         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
 619                "asyncts audio filter instead.\n");
 620
 621         if (audio_sync_method > 1)
 622             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
 623                             "max_comp=%d:", audio_sync_method);
 624         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
 625                  audio_drift_threshold);
 626
 627         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
 628                  fg->index, ist->file_index, ist->st->index);
 629         ret = avfilter_graph_create_filter(&async,
 630                                            avfilter_get_by_name("asyncts"),
 631                                            name, args, NULL, fg->graph);
 632         if (ret < 0)
 633             return ret;
 634
 635         ret = avfilter_link(last_filter, 0, async, 0);
 636         if (ret < 0)
 637             return ret;
 638
 639         last_filter = async;
 640     }
 641     if (audio_volume != 256) {
 642         AVFilterContext *volume;
 643
 644         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 645                "audio filter instead.\n");
 646
 647         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
 648
 649         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
 650                  fg->index, ist->file_index, ist->st->index);
 651         ret = avfilter_graph_create_filter(&volume,
 652                                            avfilter_get_by_name("volume"),
 653                                            name, args, NULL, fg->graph);
 654         if (ret < 0)
 655             return ret;
 656
 657         ret = avfilter_link(last_filter, 0, volume, 0);
 658         if (ret < 0)
 659             return ret;
 660
 661         last_filter = volume;
 662     }
 663
 664     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 665              ist->file_index, ist->st->index);
 666     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 667                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 668     if (ret < 0)
 669         return ret;
 670
 671     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 672         return ret;
 673
 674     return 0;
 675 }
 676
 677 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 678                                   AVFilterInOut *in)
 679 {
 680     av_freep(&ifilter->name);
 681     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 682
 683     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 684     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 685     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 686     default: av_assert0(0);
 687     }
 688 }
 689
 690 int configure_filtergraph(FilterGraph *fg)
 691 {
 692     AVFilterInOut *inputs, *outputs, *cur;
 693     int ret, i, simple = !fg->graph_desc;
 694     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 695                                       fg->graph_desc;
 696
 697     avfilter_graph_free(&fg->graph);
 698     if (!(fg->graph = avfilter_graph_alloc()))
 699         return AVERROR(ENOMEM);
 700
 701     if (simple) {
 702         OutputStream *ost = fg->outputs[0]->ost;
 703         char args[512];
 704         AVDictionaryEntry *e = NULL;
 705
 706         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 707         fg->graph->scale_sws_opts = av_strdup(args);
 708
 709         args[0] = '\0';
 710         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 711                                 AV_DICT_IGNORE_SUFFIX))) {
 712             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 713         }
 714         if (strlen(args))
 715             args[strlen(args) - 1] = '\0';
 716         fg->graph->resample_lavr_opts = av_strdup(args);
 717     }
 718
 719     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 720         return ret;
 721
 722     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 723         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 724                "exactly one input and output.\n", graph_desc);
 725         return AVERROR(EINVAL);
 726     }
 727
 728     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 729         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 730             return ret;
 731     avfilter_inout_free(&inputs);
 732
 733     for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
 734         OutputFilter *ofilter = fg->outputs[i];
 735         if (ofilter->ost)
 736             configure_output_filter(fg, ofilter, cur);
 737     }
 738
 739     avfilter_inout_free(&outputs);
 740
 741     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 742         return ret;
 743
 744     return 0;
 745 }
 746
 747 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 748 {
 749     int i;
 750     for (i = 0; i < fg->nb_inputs; i++)
 751         if (fg->inputs[i]->ist == ist)
 752             return 1;
 753     return 0;
 754 }
 755