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