avconv_filter.c

   1 /*
   2  * avconv filter configuration
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stdint.h>
  22
  23 #include "avconv.h"
  24
  25 #include "libavfilter/avfilter.h"
  26
  27 #include "libavresample/avresample.h"
  28
  29 #include "libavutil/avassert.h"
  30 #include "libavutil/avstring.h"
  31 #include "libavutil/channel_layout.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "libavutil/pixfmt.h"
  35 #include "libavutil/samplefmt.h"
  36
  37 /* Define a function for building a string containing a list of
  38  * allowed formats. */
  39 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
  40 static char *choose_ ## var ## s(OutputStream *ost)                            \
  41 {                                                                              \
  42     if (ost->enc_ctx->var != none) {                                           \
  43         get_name(ost->enc_ctx->var);                                           \
  44         return av_strdup(name);                                                \
  45     } else if (ost->enc && ost->enc->supported_list) {                         \
  46         const type *p;                                                         \
  47         AVIOContext *s = NULL;                                                 \
  48         uint8_t *ret;                                                          \
  49         int len;                                                               \
  50                                                                                \
  51         if (avio_open_dyn_buf(&s) < 0)                                         \
  52             exit(1);                                                           \
  53                                                                                \
  54         for (p = ost->enc->supported_list; *p != none; p++) {                  \
  55             get_name(*p);                                                      \
  56             avio_printf(s, "%s|", name);                                       \
  57         }                                                                      \
  58         len = avio_close_dyn_buf(s, &ret);                                     \
  59         ret[len - 1] = 0;                                                      \
  60         return ret;                                                            \
  61     } else                                                                     \
  62         return NULL;                                                           \
  63 }
  64
  65 DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
  66                   GET_PIX_FMT_NAME)
  67
  68 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
  69                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
  70
  71 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
  72                   GET_SAMPLE_RATE_NAME)
  73
  74 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
  75                   GET_CH_LAYOUT_NAME)
  76
  77 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
  78 {
  79     FilterGraph *fg = av_mallocz(sizeof(*fg));
  80
  81     if (!fg)
  82         exit(1);
  83     fg->index = nb_filtergraphs;
  84
  85     GROW_ARRAY(fg->outputs, fg->nb_outputs);
  86     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
  87         exit(1);
  88     fg->outputs[0]->ost   = ost;
  89     fg->outputs[0]->graph = fg;
  90
  91     ost->filter = fg->outputs[0];
  92
  93     GROW_ARRAY(fg->inputs, fg->nb_inputs);
  94     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
  95         exit(1);
  96     fg->inputs[0]->ist   = ist;
  97     fg->inputs[0]->graph = fg;
  98
  99     GROW_ARRAY(ist->filters, ist->nb_filters);
 100     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 101
 102     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 103     filtergraphs[nb_filtergraphs - 1] = fg;
 104
 105     return fg;
 106 }
 107
 108 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 109 {
 110     InputStream *ist = NULL;
 111     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 112     int i;
 113
 114     // TODO: support other filter types
 115     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 116         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 117                "currently.\n");
 118         exit(1);
 119     }
 120
 121     if (in->name) {
 122         AVFormatContext *s;
 123         AVStream       *st = NULL;
 124         char *p;
 125         int file_idx = strtol(in->name, &p, 0);
 126
 127         if (file_idx < 0 || file_idx >= nb_input_files) {
 128             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
 129                    file_idx, fg->graph_desc);
 130             exit(1);
 131         }
 132         s = input_files[file_idx]->ctx;
 133
 134         for (i = 0; i < s->nb_streams; i++) {
 135             if (s->streams[i]->codec->codec_type != type)
 136                 continue;
 137             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 138                 st = s->streams[i];
 139                 break;
 140             }
 141         }
 142         if (!st) {
 143             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 144                    "matches no streams.\n", p, fg->graph_desc);
 145             exit(1);
 146         }
 147         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 148     } else {
 149         /* find the first unused stream of corresponding type */
 150         for (i = 0; i < nb_input_streams; i++) {
 151             ist = input_streams[i];
 152             if (ist->dec_ctx->codec_type == type && ist->discard)
 153                 break;
 154         }
 155         if (i == nb_input_streams) {
 156             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 157                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 158                    in->filter_ctx->name);
 159             exit(1);
 160         }
 161     }
 162     av_assert0(ist);
 163
 164     ist->discard         = 0;
 165     ist->decoding_needed = 1;
 166     ist->st->discard = AVDISCARD_NONE;
 167
 168     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 169     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 170         exit(1);
 171     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 172     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 173
 174     GROW_ARRAY(ist->filters, ist->nb_filters);
 175     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 176 }
 177
 178 static int insert_trim(int64_t start_time, int64_t duration,
 179                        AVFilterContext **last_filter, int *pad_idx,
 180                        const char *filter_name)
 181 {
 182     AVFilterGraph *graph = (*last_filter)->graph;
 183     AVFilterContext *ctx;
 184     const AVFilter *trim;
 185     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 186     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 187     int ret = 0;
 188
 189     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 190         return 0;
 191
 192     trim = avfilter_get_by_name(name);
 193     if (!trim) {
 194         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 195                "recording time.\n", name);
 196         return AVERROR_FILTER_NOT_FOUND;
 197     }
 198
 199     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 200     if (!ctx)
 201         return AVERROR(ENOMEM);
 202
 203     if (duration != INT64_MAX) {
 204         ret = av_opt_set_double(ctx, "duration", (double)duration / 1e6,
 205                                 AV_OPT_SEARCH_CHILDREN);
 206     }
 207     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 208         ret = av_opt_set_double(ctx, "start", (double)start_time / 1e6,
 209                                 AV_OPT_SEARCH_CHILDREN);
 210     }
 211     if (ret < 0) {
 212         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 213         return ret;
 214     }
 215
 216     ret = avfilter_init_str(ctx, NULL);
 217     if (ret < 0)
 218         return ret;
 219
 220     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 221     if (ret < 0)
 222         return ret;
 223
 224     *last_filter = ctx;
 225     *pad_idx     = 0;
 226     return 0;
 227 }
 228
 229 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 230 {
 231     char *pix_fmts;
 232     OutputStream *ost = ofilter->ost;
 233     OutputFile    *of = output_files[ost->file_index];
 234     AVCodecContext *codec = ost->enc_ctx;
 235     AVFilterContext *last_filter = out->filter_ctx;
 236     int pad_idx = out->pad_idx;
 237     int ret;
 238     char name[255];
 239
 240     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 241     ret = avfilter_graph_create_filter(&ofilter->filter,
 242                                        avfilter_get_by_name("buffersink"),
 243                                        name, NULL, NULL, fg->graph);
 244     if (ret < 0)
 245         return ret;
 246
 247     if (codec->width || codec->height) {
 248         char args[255];
 249         AVFilterContext *filter;
 250
 251         snprintf(args, sizeof(args), "%d:%d:0x%X",
 252                  codec->width,
 253                  codec->height,
 254                  (unsigned)ost->sws_flags);
 255         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 256                  ost->file_index, ost->index);
 257         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 258                                                 name, args, NULL, fg->graph)) < 0)
 259             return ret;
 260         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 261             return ret;
 262
 263         last_filter = filter;
 264         pad_idx = 0;
 265     }
 266
 267     if ((pix_fmts = choose_pix_fmts(ost))) {
 268         AVFilterContext *filter;
 269         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 270                  ost->file_index, ost->index);
 271         if ((ret = avfilter_graph_create_filter(&filter,
 272                                                 avfilter_get_by_name("format"),
 273                                                 "format", pix_fmts, NULL,
 274                                                 fg->graph)) < 0)
 275             return ret;
 276         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 277             return ret;
 278
 279         last_filter = filter;
 280         pad_idx     = 0;
 281         av_freep(&pix_fmts);
 282     }
 283
 284     if (ost->frame_rate.num) {
 285         AVFilterContext *fps;
 286         char args[255];
 287
 288         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 289                  ost->frame_rate.den);
 290         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 291                  ost->file_index, ost->index);
 292         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 293                                            name, args, NULL, fg->graph);
 294         if (ret < 0)
 295             return ret;
 296
 297         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 298         if (ret < 0)
 299             return ret;
 300         last_filter = fps;
 301         pad_idx = 0;
 302     }
 303
 304     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 305              ost->file_index, ost->index);
 306     ret = insert_trim(of->start_time, of->recording_time,
 307                       &last_filter, &pad_idx, name);
 308     if (ret < 0)
 309         return ret;
 310
 311
 312     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 313         return ret;
 314
 315     return 0;
 316 }
 317
 318 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 319 {
 320     OutputStream *ost = ofilter->ost;
 321     OutputFile    *of = output_files[ost->file_index];
 322     AVCodecContext *codec  = ost->enc_ctx;
 323     AVFilterContext *last_filter = out->filter_ctx;
 324     int pad_idx = out->pad_idx;
 325     char *sample_fmts, *sample_rates, *channel_layouts;
 326     char name[255];
 327     int ret;
 328
 329
 330     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 331     ret = avfilter_graph_create_filter(&ofilter->filter,
 332                                        avfilter_get_by_name("abuffersink"),
 333                                        name, NULL, NULL, fg->graph);
 334     if (ret < 0)
 335         return ret;
 336
 337     if (codec->channels && !codec->channel_layout)
 338         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 339
 340     sample_fmts     = choose_sample_fmts(ost);
 341     sample_rates    = choose_sample_rates(ost);
 342     channel_layouts = choose_channel_layouts(ost);
 343     if (sample_fmts || sample_rates || channel_layouts) {
 344         AVFilterContext *format;
 345         char args[256];
 346         int len = 0;
 347
 348         if (sample_fmts)
 349             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
 350                             sample_fmts);
 351         if (sample_rates)
 352             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
 353                             sample_rates);
 354         if (channel_layouts)
 355             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
 356                             channel_layouts);
 357         args[len - 1] = 0;
 358
 359         av_freep(&sample_fmts);
 360         av_freep(&sample_rates);
 361         av_freep(&channel_layouts);
 362
 363         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 364                  ost->file_index, ost->index);
 365         ret = avfilter_graph_create_filter(&format,
 366                                            avfilter_get_by_name("aformat"),
 367                                            name, args, NULL, fg->graph);
 368         if (ret < 0)
 369             return ret;
 370
 371         ret = avfilter_link(last_filter, pad_idx, format, 0);
 372         if (ret < 0)
 373             return ret;
 374
 375         last_filter = format;
 376         pad_idx = 0;
 377     }
 378
 379     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 380              ost->file_index, ost->index);
 381     ret = insert_trim(of->start_time, of->recording_time,
 382                       &last_filter, &pad_idx, name);
 383     if (ret < 0)
 384         return ret;
 385
 386     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 387         return ret;
 388
 389     return 0;
 390 }
 391
 392 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 393 {                                                                  \
 394     AVFilterContext *ctx = inout->filter_ctx;                      \
 395     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 396     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 397     AVIOContext *pb;                                               \
 398                                                                    \
 399     if (avio_open_dyn_buf(&pb) < 0)                                \
 400         exit(1);                                                   \
 401                                                                    \
 402     avio_printf(pb, "%s", ctx->filter->name);                      \
 403     if (nb_pads > 1)                                               \
 404         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 405     avio_w8(pb, 0);                                                \
 406     avio_close_dyn_buf(pb, &f->name);                              \
 407 }
 408
 409 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 410 {
 411     av_freep(&ofilter->name);
 412     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 413
 414     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 415     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 416     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 417     default: av_assert0(0);
 418     }
 419 }
 420
 421 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 422                                         AVFilterInOut *in)
 423 {
 424     AVFilterContext *last_filter;
 425     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 426     InputStream *ist = ifilter->ist;
 427     InputFile     *f = input_files[ist->file_index];
 428     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 429                                          ist->st->time_base;
 430     AVRational sar;
 431     char args[255], name[255];
 432     int ret, pad_idx = 0;
 433
 434     sar = ist->st->sample_aspect_ratio.num ?
 435           ist->st->sample_aspect_ratio :
 436           ist->dec_ctx->sample_aspect_ratio;
 437     snprintf(args, sizeof(args), "%d:%d:%d:%d:%d:%d:%d", ist->dec_ctx->width,
 438              ist->dec_ctx->height,
 439              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->dec_ctx->pix_fmt,
 440              tb.num, tb.den, sar.num, sar.den);
 441     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 442              ist->file_index, ist->st->index);
 443
 444     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 445                                             args, NULL, fg->graph)) < 0)
 446         return ret;
 447     last_filter = ifilter->filter;
 448
 449     if (ist->framerate.num) {
 450         AVFilterContext *setpts;
 451
 452         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 453                  ist->file_index, ist->st->index);
 454         if ((ret = avfilter_graph_create_filter(&setpts,
 455                                                 avfilter_get_by_name("setpts"),
 456                                                 name, "N", NULL,
 457                                                 fg->graph)) < 0)
 458             return ret;
 459
 460         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 461             return ret;
 462
 463         last_filter = setpts;
 464     }
 465
 466     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 467              ist->file_index, ist->st->index);
 468     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 469                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 470     if (ret < 0)
 471         return ret;
 472
 473     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 474         return ret;
 475     return 0;
 476 }
 477
 478 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 479                                         AVFilterInOut *in)
 480 {
 481     AVFilterContext *last_filter;
 482     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 483     InputStream *ist = ifilter->ist;
 484     InputFile     *f = input_files[ist->file_index];
 485     char args[255], name[255];
 486     int ret, pad_idx = 0;
 487
 488     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
 489              ":channel_layout=0x%"PRIx64,
 490              1, ist->dec_ctx->sample_rate,
 491              ist->dec_ctx->sample_rate,
 492              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt),
 493              ist->dec_ctx->channel_layout);
 494     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 495              ist->file_index, ist->st->index);
 496
 497     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 498                                             name, args, NULL,
 499                                             fg->graph)) < 0)
 500         return ret;
 501     last_filter = ifilter->filter;
 502
 503     if (audio_sync_method > 0) {
 504         AVFilterContext *async;
 505         int  len = 0;
 506
 507         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
 508                "asyncts audio filter instead.\n");
 509
 510         if (audio_sync_method > 1)
 511             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
 512                             "max_comp=%d:", audio_sync_method);
 513         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
 514                  audio_drift_threshold);
 515
 516         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
 517                  fg->index, ist->file_index, ist->st->index);
 518         ret = avfilter_graph_create_filter(&async,
 519                                            avfilter_get_by_name("asyncts"),
 520                                            name, args, NULL, fg->graph);
 521         if (ret < 0)
 522             return ret;
 523
 524         ret = avfilter_link(last_filter, 0, async, 0);
 525         if (ret < 0)
 526             return ret;
 527
 528         last_filter = async;
 529     }
 530     if (audio_volume != 256) {
 531         AVFilterContext *volume;
 532
 533         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 534                "audio filter instead.\n");
 535
 536         snprintf(args, sizeof(args), "volume=%f", audio_volume / 256.0);
 537
 538         snprintf(name, sizeof(name), "graph %d volume for input stream %d:%d",
 539                  fg->index, ist->file_index, ist->st->index);
 540         ret = avfilter_graph_create_filter(&volume,
 541                                            avfilter_get_by_name("volume"),
 542                                            name, args, NULL, fg->graph);
 543         if (ret < 0)
 544             return ret;
 545
 546         ret = avfilter_link(last_filter, 0, volume, 0);
 547         if (ret < 0)
 548             return ret;
 549
 550         last_filter = volume;
 551     }
 552
 553     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 554              ist->file_index, ist->st->index);
 555     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 556                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 557     if (ret < 0)
 558         return ret;
 559
 560     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 561         return ret;
 562
 563     return 0;
 564 }
 565
 566 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 567                                   AVFilterInOut *in)
 568 {
 569     av_freep(&ifilter->name);
 570     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 571
 572     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 573     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 574     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 575     default: av_assert0(0);
 576     }
 577 }
 578
 579 int configure_filtergraph(FilterGraph *fg)
 580 {
 581     AVFilterInOut *inputs, *outputs, *cur;
 582     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 583     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 584                                       fg->graph_desc;
 585
 586     avfilter_graph_free(&fg->graph);
 587     if (!(fg->graph = avfilter_graph_alloc()))
 588         return AVERROR(ENOMEM);
 589
 590     if (simple) {
 591         OutputStream *ost = fg->outputs[0]->ost;
 592         char args[512];
 593         AVDictionaryEntry *e = NULL;
 594
 595         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 596         fg->graph->scale_sws_opts = av_strdup(args);
 597
 598         args[0] = '\0';
 599         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 600                                 AV_DICT_IGNORE_SUFFIX))) {
 601             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 602         }
 603         if (strlen(args))
 604             args[strlen(args) - 1] = '\0';
 605         fg->graph->resample_lavr_opts = av_strdup(args);
 606     }
 607
 608     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 609         return ret;
 610
 611     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 612         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 613                "exactly one input and output.\n", graph_desc);
 614         return AVERROR(EINVAL);
 615     }
 616
 617     for (cur = inputs; !simple && init && cur; cur = cur->next)
 618         init_input_filter(fg, cur);
 619
 620     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 621         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 622             return ret;
 623     avfilter_inout_free(&inputs);
 624
 625     if (!init || simple) {
 626         /* we already know the mappings between lavfi outputs and output streams,
 627          * so we can finish the setup */
 628         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 629             configure_output_filter(fg, fg->outputs[i], cur);
 630         avfilter_inout_free(&outputs);
 631
 632         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 633             return ret;
 634     } else {
 635         /* wait until output mappings are processed */
 636         for (cur = outputs; cur;) {
 637             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 638             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 639                 exit(1);
 640             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 641             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 642             cur = cur->next;
 643             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 644         }
 645     }
 646
 647     return 0;
 648 }
 649
 650 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 651 {
 652     int i;
 653     for (i = 0; i < fg->nb_inputs; i++)
 654         if (fg->inputs[i]->ist == ist)
 655             return 1;
 656     return 0;
 657 }
 658