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(suffix, type, var, supported_list, none, get_name)   \
  42 static char *choose_ ## suffix (OutputFilter *ofilter)                         \
  43 {                                                                              \
  44     if (ofilter->var != none) {                                                \
  45         get_name(ofilter->var);                                                \
  46         return av_strdup(name);                                                \
  47     } else if (ofilter->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 = ofilter->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(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
  68                   GET_PIX_FMT_NAME)
  69
  70 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
  71                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
  72
  73 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
  74                   GET_SAMPLE_RATE_NAME)
  75
  76 DEF_CHOOSE_FORMAT(channel_layouts, 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     fg->outputs[0]->format = -1;
  93
  94     ost->filter = fg->outputs[0];
  95
  96     GROW_ARRAY(fg->inputs, fg->nb_inputs);
  97     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
  98         exit(1);
  99     fg->inputs[0]->ist   = ist;
 100     fg->inputs[0]->graph = fg;
 101     fg->inputs[0]->format = -1;
 102
 103     fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
 104     if (!fg->inputs[0])
 105         exit_program(1);
 106
 107     GROW_ARRAY(ist->filters, ist->nb_filters);
 108     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 109
 110     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 111     filtergraphs[nb_filtergraphs - 1] = fg;
 112
 113     return 0;
 114 }
 115
 116 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 117 {
 118     InputStream *ist = NULL;
 119     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 120     int i;
 121
 122     // TODO: support other filter types
 123     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 124         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 125                "currently.\n");
 126         exit(1);
 127     }
 128
 129     if (in->name) {
 130         AVFormatContext *s;
 131         AVStream       *st = NULL;
 132         char *p;
 133         int file_idx = strtol(in->name, &p, 0);
 134
 135         if (file_idx < 0 || file_idx >= nb_input_files) {
 136             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
 137                    file_idx, fg->graph_desc);
 138             exit(1);
 139         }
 140         s = input_files[file_idx]->ctx;
 141
 142         for (i = 0; i < s->nb_streams; i++) {
 143             if (s->streams[i]->codecpar->codec_type != type)
 144                 continue;
 145             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 146                 st = s->streams[i];
 147                 break;
 148             }
 149         }
 150         if (!st) {
 151             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 152                    "matches no streams.\n", p, fg->graph_desc);
 153             exit(1);
 154         }
 155         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 156     } else {
 157         /* find the first unused stream of corresponding type */
 158         for (i = 0; i < nb_input_streams; i++) {
 159             ist = input_streams[i];
 160             if (ist->dec_ctx->codec_type == type && ist->discard)
 161                 break;
 162         }
 163         if (i == nb_input_streams) {
 164             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 165                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 166                    in->filter_ctx->name);
 167             exit(1);
 168         }
 169     }
 170     av_assert0(ist);
 171
 172     ist->discard         = 0;
 173     ist->decoding_needed = 1;
 174     ist->st->discard = AVDISCARD_NONE;
 175
 176     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 177     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 178         exit(1);
 179     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 180     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 181     fg->inputs[fg->nb_inputs - 1]->format = -1;
 182
 183     fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
 184     if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
 185         exit_program(1);
 186
 187     GROW_ARRAY(ist->filters, ist->nb_filters);
 188     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 189 }
 190
 191 int init_complex_filtergraph(FilterGraph *fg)
 192 {
 193     AVFilterInOut *inputs, *outputs, *cur;
 194     AVFilterGraph *graph;
 195     int ret = 0;
 196
 197     /* this graph is only used for determining the kinds of inputs
 198      * and outputs we have, and is discarded on exit from this function */
 199     graph = avfilter_graph_alloc();
 200     if (!graph)
 201         return AVERROR(ENOMEM);
 202
 203     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 204     if (ret < 0)
 205         goto fail;
 206
 207     for (cur = inputs; cur; cur = cur->next)
 208         init_input_filter(fg, cur);
 209
 210     for (cur = outputs; cur;) {
 211         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 212         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 213         if (!fg->outputs[fg->nb_outputs - 1])
 214             exit(1);
 215
 216         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 217         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 218         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 219                                                                          cur->pad_idx);
 220         cur = cur->next;
 221         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 222     }
 223
 224 fail:
 225     avfilter_inout_free(&inputs);
 226     avfilter_graph_free(&graph);
 227     return ret;
 228 }
 229
 230 static int insert_trim(int64_t start_time, int64_t duration,
 231                        AVFilterContext **last_filter, int *pad_idx,
 232                        const char *filter_name)
 233 {
 234     AVFilterGraph *graph = (*last_filter)->graph;
 235     AVFilterContext *ctx;
 236     const AVFilter *trim;
 237     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 238     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 239     int ret = 0;
 240
 241     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 242         return 0;
 243
 244     trim = avfilter_get_by_name(name);
 245     if (!trim) {
 246         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 247                "recording time.\n", name);
 248         return AVERROR_FILTER_NOT_FOUND;
 249     }
 250
 251     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 252     if (!ctx)
 253         return AVERROR(ENOMEM);
 254
 255     if (duration != INT64_MAX) {
 256         ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
 257                                 AV_OPT_SEARCH_CHILDREN);
 258     }
 259     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 260         ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
 261                                 AV_OPT_SEARCH_CHILDREN);
 262     }
 263     if (ret < 0) {
 264         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 265         return ret;
 266     }
 267
 268     ret = avfilter_init_str(ctx, NULL);
 269     if (ret < 0)
 270         return ret;
 271
 272     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 273     if (ret < 0)
 274         return ret;
 275
 276     *last_filter = ctx;
 277     *pad_idx     = 0;
 278     return 0;
 279 }
 280
 281 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 282                          const char *filter_name, const char *args)
 283 {
 284     AVFilterGraph *graph = (*last_filter)->graph;
 285     AVFilterContext *ctx;
 286     int ret;
 287
 288     ret = avfilter_graph_create_filter(&ctx,
 289                                        avfilter_get_by_name(filter_name),
 290                                        filter_name, args, NULL, graph);
 291     if (ret < 0)
 292         return ret;
 293
 294     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 295     if (ret < 0)
 296         return ret;
 297
 298     *last_filter = ctx;
 299     *pad_idx     = 0;
 300     return 0;
 301 }
 302
 303 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 304 {
 305     char *pix_fmts;
 306     OutputStream *ost = ofilter->ost;
 307     OutputFile    *of = output_files[ost->file_index];
 308     AVFilterContext *last_filter = out->filter_ctx;
 309     int pad_idx = out->pad_idx;
 310     int ret;
 311     char name[255];
 312
 313     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 314     ret = avfilter_graph_create_filter(&ofilter->filter,
 315                                        avfilter_get_by_name("buffersink"),
 316                                        name, NULL, NULL, fg->graph);
 317     if (ret < 0)
 318         return ret;
 319
 320     if (ofilter->width || ofilter->height) {
 321         char args[255];
 322         AVFilterContext *filter;
 323
 324         snprintf(args, sizeof(args), "%d:%d:0x%X",
 325                  ofilter->width, ofilter->height,
 326                  (unsigned)ost->sws_flags);
 327         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 328                  ost->file_index, ost->index);
 329         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 330                                                 name, args, NULL, fg->graph)) < 0)
 331             return ret;
 332         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 333             return ret;
 334
 335         last_filter = filter;
 336         pad_idx = 0;
 337     }
 338
 339     if ((pix_fmts = choose_pix_fmts(ofilter))) {
 340         AVFilterContext *filter;
 341         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 342                  ost->file_index, ost->index);
 343         ret = avfilter_graph_create_filter(&filter,
 344                                            avfilter_get_by_name("format"),
 345                                            "format", pix_fmts, NULL, fg->graph);
 346         av_freep(&pix_fmts);
 347         if (ret < 0)
 348             return ret;
 349         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 350             return ret;
 351
 352         last_filter = filter;
 353         pad_idx     = 0;
 354     }
 355
 356     if (ost->frame_rate.num) {
 357         AVFilterContext *fps;
 358         char args[255];
 359
 360         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 361                  ost->frame_rate.den);
 362         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 363                  ost->file_index, ost->index);
 364         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 365                                            name, args, NULL, fg->graph);
 366         if (ret < 0)
 367             return ret;
 368
 369         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 370         if (ret < 0)
 371             return ret;
 372         last_filter = fps;
 373         pad_idx = 0;
 374     }
 375
 376     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 377              ost->file_index, ost->index);
 378     ret = insert_trim(of->start_time, of->recording_time,
 379                       &last_filter, &pad_idx, name);
 380     if (ret < 0)
 381         return ret;
 382
 383
 384     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 385         return ret;
 386
 387     return 0;
 388 }
 389
 390 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 391 {
 392     OutputStream *ost = ofilter->ost;
 393     OutputFile    *of = output_files[ost->file_index];
 394     AVCodecContext *codec  = ost->enc_ctx;
 395     AVFilterContext *last_filter = out->filter_ctx;
 396     int pad_idx = out->pad_idx;
 397     char *sample_fmts, *sample_rates, *channel_layouts;
 398     char name[255];
 399     int ret;
 400
 401
 402     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 403     ret = avfilter_graph_create_filter(&ofilter->filter,
 404                                        avfilter_get_by_name("abuffersink"),
 405                                        name, NULL, NULL, fg->graph);
 406     if (ret < 0)
 407         return ret;
 408
 409     if (codec->channels && !codec->channel_layout)
 410         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 411
 412     sample_fmts     = choose_sample_fmts(ofilter);
 413     sample_rates    = choose_sample_rates(ofilter);
 414     channel_layouts = choose_channel_layouts(ofilter);
 415     if (sample_fmts || sample_rates || channel_layouts) {
 416         AVFilterContext *format;
 417         char args[256];
 418         int len = 0;
 419
 420         if (sample_fmts)
 421             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
 422                             sample_fmts);
 423         if (sample_rates)
 424             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
 425                             sample_rates);
 426         if (channel_layouts)
 427             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
 428                             channel_layouts);
 429         args[len - 1] = 0;
 430
 431         av_freep(&sample_fmts);
 432         av_freep(&sample_rates);
 433         av_freep(&channel_layouts);
 434
 435         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 436                  ost->file_index, ost->index);
 437         ret = avfilter_graph_create_filter(&format,
 438                                            avfilter_get_by_name("aformat"),
 439                                            name, args, NULL, fg->graph);
 440         if (ret < 0)
 441             return ret;
 442
 443         ret = avfilter_link(last_filter, pad_idx, format, 0);
 444         if (ret < 0)
 445             return ret;
 446
 447         last_filter = format;
 448         pad_idx = 0;
 449     }
 450
 451     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 452              ost->file_index, ost->index);
 453     ret = insert_trim(of->start_time, of->recording_time,
 454                       &last_filter, &pad_idx, name);
 455     if (ret < 0)
 456         return ret;
 457
 458     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 459         return ret;
 460
 461     return 0;
 462 }
 463
 464 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 465 {                                                                  \
 466     AVFilterContext *ctx = inout->filter_ctx;                      \
 467     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 468     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 469     AVIOContext *pb;                                               \
 470                                                                    \
 471     if (avio_open_dyn_buf(&pb) < 0)                                \
 472         exit(1);                                                   \
 473                                                                    \
 474     avio_printf(pb, "%s", ctx->filter->name);                      \
 475     if (nb_pads > 1)                                               \
 476         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 477     avio_w8(pb, 0);                                                \
 478     avio_close_dyn_buf(pb, &f->name);                              \
 479 }
 480
 481 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 482 {
 483     av_freep(&ofilter->name);
 484     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 485
 486     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 487     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 488     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 489     default: av_assert0(0);
 490     }
 491 }
 492
 493 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 494                                         AVFilterInOut *in)
 495 {
 496     AVFilterContext *last_filter;
 497     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 498     InputStream *ist = ifilter->ist;
 499     InputFile     *f = input_files[ist->file_index];
 500     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 501                                          ist->st->time_base;
 502     AVBufferSrcParameters *par;
 503     char name[255];
 504     int ret, pad_idx = 0;
 505
 506     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 507              ist->file_index, ist->st->index);
 508
 509     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, buffer_filt, name);
 510     if (!ifilter->filter)
 511         return AVERROR(ENOMEM);
 512
 513     par = av_buffersrc_parameters_alloc();
 514     if (!par)
 515         return AVERROR(ENOMEM);
 516
 517     par->sample_aspect_ratio = ifilter->sample_aspect_ratio;
 518     par->width               = ifilter->width;
 519     par->height              = ifilter->height;
 520     par->format              = ifilter->format;
 521     par->time_base           = tb;
 522     if (ist->framerate.num)
 523         par->frame_rate      = ist->framerate;
 524     par->hw_frames_ctx       = ifilter->hw_frames_ctx;
 525
 526     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 527     av_freep(&par);
 528     if (ret < 0)
 529         return ret;
 530
 531     ret = avfilter_init_str(ifilter->filter, NULL);
 532     if (ret < 0)
 533         return ret;
 534
 535     last_filter = ifilter->filter;
 536
 537     if (ist->autorotate) {
 538         uint8_t* displaymatrix = av_stream_get_side_data(ist->st,
 539                                                          AV_PKT_DATA_DISPLAYMATRIX, NULL);
 540         if (displaymatrix) {
 541             double rot = av_display_rotation_get((int32_t*) displaymatrix);
 542             if (rot < -135 || rot > 135) {
 543                 ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 544                 if (ret < 0)
 545                     return ret;
 546                 ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 547             } else if (rot < -45) {
 548                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=clock");
 549             } else if (rot > 45) {
 550                 ret = insert_filter(&last_filter, &pad_idx, "transpose", "dir=cclock");
 551             }
 552             if (ret < 0)
 553                 return ret;
 554         }
 555     }
 556
 557     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 558              ist->file_index, ist->st->index);
 559     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 560                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 561     if (ret < 0)
 562         return ret;
 563
 564     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 565         return ret;
 566     return 0;
 567 }
 568
 569 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 570                                         AVFilterInOut *in)
 571 {
 572     AVFilterContext *last_filter;
 573     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 574     InputStream *ist = ifilter->ist;
 575     InputFile     *f = input_files[ist->file_index];
 576     AVBufferSrcParameters *par;
 577     char args[255], name[255];
 578     int ret, pad_idx = 0;
 579
 580     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 581              ist->file_index, ist->st->index);
 582
 583     ifilter->filter = avfilter_graph_alloc_filter(fg->graph, abuffer_filt, name);
 584     if (!ifilter->filter)
 585         return AVERROR(ENOMEM);
 586
 587     par = av_buffersrc_parameters_alloc();
 588     if (!par)
 589         return AVERROR(ENOMEM);
 590
 591     par->time_base      = (AVRational){ 1, ifilter->sample_rate };
 592     par->sample_rate    = ifilter->sample_rate;
 593     par->format         = ifilter->format;
 594     par->channel_layout = ifilter->channel_layout;
 595
 596     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 597     av_freep(&par);
 598     if (ret < 0)
 599         return ret;
 600
 601     ret = avfilter_init_str(ifilter->filter, NULL);
 602     if (ret < 0)
 603         return ret;
 604     last_filter = ifilter->filter;
 605
 606     if (audio_sync_method > 0) {
 607         AVFilterContext *async;
 608         int  len = 0;
 609
 610         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
 611                "asyncts audio filter instead.\n");
 612
 613         if (audio_sync_method > 1)
 614             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
 615                             "max_comp=%d:", audio_sync_method);
 616         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
 617                  audio_drift_threshold);
 618
 619         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
 620                  fg->index, ist->file_index, ist->st->index);
 621         ret = avfilter_graph_create_filter(&async,
 622                                            avfilter_get_by_name("asyncts"),
 623                                            name, args, NULL, fg->graph);
 624         if (ret < 0)
 625             return ret;
 626
 627         ret = avfilter_link(last_filter, 0, async, 0);
 628         if (ret < 0)
 629             return ret;
 630
 631         last_filter = async;
 632     }
 633     if (audio_volume != 256) {
 634         AVFilterContext *volume;
 635
 636         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 637                "audio filter instead.\n");
 638
 639         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
 640
 641         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
 642                  fg->index, ist->file_index, ist->st->index);
 643         ret = avfilter_graph_create_filter(&volume,
 644                                            avfilter_get_by_name("volume"),
 645                                            name, args, NULL, fg->graph);
 646         if (ret < 0)
 647             return ret;
 648
 649         ret = avfilter_link(last_filter, 0, volume, 0);
 650         if (ret < 0)
 651             return ret;
 652
 653         last_filter = volume;
 654     }
 655
 656     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 657              ist->file_index, ist->st->index);
 658     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 659                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 660     if (ret < 0)
 661         return ret;
 662
 663     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 664         return ret;
 665
 666     return 0;
 667 }
 668
 669 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 670                                   AVFilterInOut *in)
 671 {
 672     av_freep(&ifilter->name);
 673     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 674
 675     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 676     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 677     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 678     default: av_assert0(0);
 679     }
 680 }
 681
 682 int configure_filtergraph(FilterGraph *fg)
 683 {
 684     AVFilterInOut *inputs, *outputs, *cur;
 685     int ret, i, simple = filtergraph_is_simple(fg);
 686     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 687                                       fg->graph_desc;
 688
 689     avfilter_graph_free(&fg->graph);
 690     if (!(fg->graph = avfilter_graph_alloc()))
 691         return AVERROR(ENOMEM);
 692
 693     if (simple) {
 694         OutputStream *ost = fg->outputs[0]->ost;
 695         char args[512];
 696         AVDictionaryEntry *e = NULL;
 697
 698         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 699         fg->graph->scale_sws_opts = av_strdup(args);
 700
 701         args[0] = '\0';
 702         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 703                                 AV_DICT_IGNORE_SUFFIX))) {
 704             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 705         }
 706         if (strlen(args))
 707             args[strlen(args) - 1] = '\0';
 708         fg->graph->resample_lavr_opts = av_strdup(args);
 709     }
 710
 711     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 712         return ret;
 713
 714     if (hw_device_ctx) {
 715         for (i = 0; i < fg->graph->nb_filters; i++) {
 716             fg->graph->filters[i]->hw_device_ctx = av_buffer_ref(hw_device_ctx);
 717         }
 718     }
 719
 720     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 721         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 722                "exactly one input and output.\n", graph_desc);
 723         return AVERROR(EINVAL);
 724     }
 725
 726     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 727         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 728             return ret;
 729     avfilter_inout_free(&inputs);
 730
 731     for (cur = outputs, i = 0; cur; cur = cur->next, i++) {
 732         OutputFilter *ofilter = fg->outputs[i];
 733         if (ofilter->ost)
 734             configure_output_filter(fg, ofilter, cur);
 735     }
 736
 737     avfilter_inout_free(&outputs);
 738
 739     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 740         return ret;
 741
 742     /* limit the lists of allowed formats to the ones selected, to
 743      * make sure they stay the same if the filtergraph is reconfigured later */
 744     for (i = 0; i < fg->nb_outputs; i++) {
 745         OutputFilter *ofilter = fg->outputs[i];
 746         AVFilterLink *link = ofilter->filter->inputs[0];
 747
 748         ofilter->format = link->format;
 749
 750         ofilter->width  = link->w;
 751         ofilter->height = link->h;
 752
 753         ofilter->sample_rate    = link->sample_rate;
 754         ofilter->channel_layout = link->channel_layout;
 755     }
 756
 757     for (i = 0; i < fg->nb_inputs; i++) {
 758         while (av_fifo_size(fg->inputs[i]->frame_queue)) {
 759             AVFrame *tmp;
 760             av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
 761             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
 762             av_frame_free(&tmp);
 763             if (ret < 0)
 764                 return ret;
 765         }
 766     }
 767
 768     /* send the EOFs for the finished inputs */
 769     for (i = 0; i < fg->nb_inputs; i++) {
 770         if (fg->inputs[i]->eof) {
 771             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, NULL);
 772             if (ret < 0)
 773                 return ret;
 774         }
 775     }
 776
 777     return 0;
 778 }
 779
 780 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
 781 {
 782     av_buffer_unref(&ifilter->hw_frames_ctx);
 783
 784     ifilter->format = frame->format;
 785
 786     ifilter->width               = frame->width;
 787     ifilter->height              = frame->height;
 788     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
 789
 790     ifilter->sample_rate         = frame->sample_rate;
 791     ifilter->channel_layout      = frame->channel_layout;
 792
 793     if (frame->hw_frames_ctx) {
 794         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
 795         if (!ifilter->hw_frames_ctx)
 796             return AVERROR(ENOMEM);
 797     }
 798
 799     return 0;
 800 }
 801
 802 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 803 {
 804     int i;
 805     for (i = 0; i < fg->nb_inputs; i++)
 806         if (fg->inputs[i]->ist == ist)
 807             return 1;
 808     return 0;
 809 }
 810
 811 int filtergraph_is_simple(FilterGraph *fg)
 812 {
 813     return !fg->graph_desc;
 814 }