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 int 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 0;
 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 (!hw_device_ctx && (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     par->hw_frames_ctx       = ist->hw_frames_ctx;
 517
 518     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 519     av_freep(&par);
 520     if (ret < 0)
 521         return ret;
 522
 523     ret = avfilter_init_str(ifilter->filter, NULL);
 524     if (ret < 0)
 525         return ret;
 526
 527     last_filter = ifilter->filter;
 528
 529     if (ist->autorotate) {
 530         uint8_t* displaymatrix = av_stream_get_side_data(ist->st,
 531                                                          AV_PKT_DATA_DISPLAYMATRIX, NULL);
 532         if (displaymatrix) {
 533             double rot = av_display_rotation_get((int32_t*) displaymatrix);
 534             if (rot < -135 || rot > 135) {
 535                 ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 536                 if (ret < 0)
 537                     return ret;
 538                 ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 539             } else if (rot < -45) {
 540                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=clock");
 541             } else if (rot > 45) {
 542                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=cclock");
 543             }
 544             if (ret < 0)
 545                 return ret;
 546         }
 547     }
 548
 549     if (ist->framerate.num) {
 550         AVFilterContext *setpts;
 551
 552         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 553                  ist->file_index, ist->st->index);
 554         if ((ret = avfilter_graph_create_filter(&setpts,
 555                                                 avfilter_get_by_name("setpts"),
 556                                                 name, "N", NULL,
 557                                                 fg->graph)) < 0)
 558             return ret;
 559
 560         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 561             return ret;
 562
 563         last_filter = setpts;
 564     }
 565
 566     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 567              ist->file_index, ist->st->index);
 568     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 569                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 570     if (ret < 0)
 571         return ret;
 572
 573     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 574         return ret;
 575     return 0;
 576 }
 577
 578 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 579                                         AVFilterInOut *in)
 580 {
 581     AVFilterContext *last_filter;
 582     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 583     InputStream *ist = ifilter->ist;
 584     InputFile     *f = input_files[ist->file_index];
 585     AVBufferSrcParameters *par;
 586     char args[255], name[255];
 587     int ret, pad_idx = 0;
 588
 589     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 590              ist->file_index, ist->st->index);
 591
 592     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, abuffer_filt, name);
 593     if (!ifilter->filter)
 594         return AVERROR(ENOMEM);
 595
 596     par = av_buffersrc_parameters_alloc();
 597     if (!par)
 598         return AVERROR(ENOMEM);
 599
 600     par->time_base      = (AVRational){ 1, ist->dec_ctx->sample_rate };
 601     par->sample_rate    = ist->dec_ctx->sample_rate;
 602     par->format         = ist->dec_ctx->sample_fmt;
 603     par->channel_layout = ist->dec_ctx->channel_layout;
 604
 605     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 606     av_freep(&par);
 607     if (ret < 0)
 608         return ret;
 609
 610     ret = avfilter_init_str(ifilter->filter, NULL);
 611     if (ret < 0)
 612         return ret;
 613     last_filter = ifilter->filter;
 614
 615     if (audio_sync_method > 0) {
 616         AVFilterContext *async;
 617         int  len = 0;
 618
 619         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
 620                "asyncts audio filter instead.\n");
 621
 622         if (audio_sync_method > 1)
 623             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
 624                             "max_comp=%d:", audio_sync_method);
 625         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
 626                  audio_drift_threshold);
 627
 628         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
 629                  fg->index, ist->file_index, ist->st->index);
 630         ret = avfilter_graph_create_filter(&async,
 631                                            avfilter_get_by_name("asyncts"),
 632                                            name, args, NULL, fg->graph);
 633         if (ret < 0)
 634             return ret;
 635
 636         ret = avfilter_link(last_filter, 0, async, 0);
 637         if (ret < 0)
 638             return ret;
 639
 640         last_filter = async;
 641     }
 642     if (audio_volume != 256) {
 643         AVFilterContext *volume;
 644
 645         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 646                "audio filter instead.\n");
 647
 648         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
 649
 650         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
 651                  fg->index, ist->file_index, ist->st->index);
 652         ret = avfilter_graph_create_filter(&volume,
 653                                            avfilter_get_by_name("volume"),
 654                                            name, args, NULL, fg->graph);
 655         if (ret < 0)
 656             return ret;
 657
 658         ret = avfilter_link(last_filter, 0, volume, 0);
 659         if (ret < 0)
 660             return ret;
 661
 662         last_filter = volume;
 663     }
 664
 665     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 666              ist->file_index, ist->st->index);
 667     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 668                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 669     if (ret < 0)
 670         return ret;
 671
 672     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 673         return ret;
 674
 675     return 0;
 676 }
 677
 678 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 679                                   AVFilterInOut *in)
 680 {
 681     av_freep(&ifilter->name);
 682     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 683
 684     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 685     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 686     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 687     default: av_assert0(0);
 688     }
 689 }
 690
 691 int configure_filtergraph(FilterGraph *fg)
 692 {
 693     AVFilterInOut *inputs, *outputs, *cur;
 694     int ret, i, simple = filtergraph_is_simple(fg);
 695     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 696                                       fg->graph_desc;
 697
 698     avfilter_graph_free(&fg->graph);
 699     if (!(fg->graph = avfilter_graph_alloc()))
 700         return AVERROR(ENOMEM);
 701
 702     if (simple) {
 703         OutputStream *ost = fg->outputs[0]->ost;
 704         char args[512];
 705         AVDictionaryEntry *e = NULL;
 706
 707         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 708         fg->graph->scale_sws_opts = av_strdup(args);
 709
 710         args[0] = '\0';
 711         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 712                                 AV_DICT_IGNORE_SUFFIX))) {
 713             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 714         }
 715         if (strlen(args))
 716             args[strlen(args) - 1] = '\0';
 717         fg->graph->resample_lavr_opts = av_strdup(args);
 718     }
 719
 720     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 721         return ret;
 722
 723     if (hw_device_ctx) {
 724         for (i = 0; i < fg->graph->nb_filters; i++) {
 725             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
 726         }
 727     }
 728
 729     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 730         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 731                "exactly one input and output.\n", graph_desc);
 732         return AVERROR(EINVAL);
 733     }
 734
 735     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 736         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 737             return ret;
 738     avfilter_inout_free(&inputs);
 739
 740     for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
 741         OutputFilter *ofilter = fg->outputs[i];
 742         if (ofilter->ost)
 743             configure_output_filter(fg, ofilter, cur);
 744     }
 745
 746     avfilter_inout_free(&outputs);
 747
 748     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 749         return ret;
 750
 751     return 0;
 752 }
 753
 754 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 755 {
 756     int i;
 757     for (i = 0; i < fg->nb_inputs; i++)
 758         if (fg->inputs[i]->ist == ist)
 759             return 1;
 760     return 0;
 761 }
 762
 763 int filtergraph_is_simple(FilterGraph *fg)
 764 {
 765     return !fg->graph_desc;
 766 }