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 "avconv.h"
  22
  23 #include "libavfilter/avfilter.h"
  24 #include "libavfilter/avfiltergraph.h"
  25
  26 #include "libavutil/audioconvert.h"
  27 #include "libavutil/avassert.h"
  28 #include "libavutil/pixdesc.h"
  29 #include "libavutil/pixfmt.h"
  30 #include "libavutil/samplefmt.h"
  31
  32 /**
  33  * Define a function for building a string containing a list of
  34  * allowed formats,
  35  */
  36 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
  37 static char *choose_ ## var ## s(OutputStream *ost)                            \
  38 {                                                                              \
  39     if (ost->st->codec->var != none) {                                         \
  40         get_name(ost->st->codec->var);                                         \
  41         return av_strdup(name);                                                \
  42     } else if (ost->enc->supported_list) {                                     \
  43         const type *p;                                                         \
  44         AVIOContext *s = NULL;                                                 \
  45         uint8_t *ret;                                                          \
  46         int len;                                                               \
  47                                                                                \
  48         if (avio_open_dyn_buf(&s) < 0)                                         \
  49             exit_program(1);                                                   \
  50                                                                                \
  51         for (p = ost->enc->supported_list; *p != none; p++) {                  \
  52             get_name(*p);                                                      \
  53             avio_printf(s, "%s" separator, name);                              \
  54         }                                                                      \
  55         len = avio_close_dyn_buf(s, &ret);                                     \
  56         ret[len - 1] = 0;                                                      \
  57         return ret;                                                            \
  58     } else                                                                     \
  59         return NULL;                                                           \
  60 }
  61
  62 #define GET_PIX_FMT_NAME(pix_fmt)\
  63     const char *name = av_get_pix_fmt_name(pix_fmt);
  64
  65 DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
  66                   GET_PIX_FMT_NAME, ":")
  67
  68 #define GET_SAMPLE_FMT_NAME(sample_fmt)\
  69     const char *name = av_get_sample_fmt_name(sample_fmt)
  70
  71 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
  72                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
  73
  74 #define GET_SAMPLE_RATE_NAME(rate)\
  75     char name[16];\
  76     snprintf(name, sizeof(name), "%d", rate);
  77
  78 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
  79                   GET_SAMPLE_RATE_NAME, ",")
  80
  81 #define GET_CH_LAYOUT_NAME(ch_layout)\
  82     char name[16];\
  83     snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
  84
  85 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
  86                   GET_CH_LAYOUT_NAME, ",")
  87
  88 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
  89 {
  90     FilterGraph *fg = av_mallocz(sizeof(*fg));
  91
  92     if (!fg)
  93         exit_program(1);
  94     fg->index = nb_filtergraphs;
  95
  96     fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
  97                              fg->nb_outputs + 1);
  98     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
  99         exit_program(1);
 100     fg->outputs[0]->ost   = ost;
 101     fg->outputs[0]->graph = fg;
 102
 103     ost->filter = fg->outputs[0];
 104
 105     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
 106                             fg->nb_inputs + 1);
 107     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 108         exit_program(1);
 109     fg->inputs[0]->ist   = ist;
 110     fg->inputs[0]->graph = fg;
 111
 112     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 113                               &ist->nb_filters, ist->nb_filters + 1);
 114     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 115
 116     filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
 117                               &nb_filtergraphs, nb_filtergraphs + 1);
 118     filtergraphs[nb_filtergraphs - 1] = fg;
 119
 120     return fg;
 121 }
 122
 123 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 124 {
 125     InputStream *ist = NULL;
 126     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 127     int i;
 128
 129     // TODO: support other filter types
 130     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 131         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 132                "currently.\n");
 133         exit_program(1);
 134     }
 135
 136     if (in->name) {
 137         AVFormatContext *s;
 138         AVStream       *st = NULL;
 139         char *p;
 140         int file_idx = strtol(in->name, &p, 0);
 141
 142         if (file_idx < 0 || file_idx >= nb_input_files) {
 143             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtegraph description %s.\n",
 144                    file_idx, fg->graph_desc);
 145             exit_program(1);
 146         }
 147         s = input_files[file_idx]->ctx;
 148
 149         for (i = 0; i < s->nb_streams; i++) {
 150             if (s->streams[i]->codec->codec_type != type)
 151                 continue;
 152             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 153                 st = s->streams[i];
 154                 break;
 155             }
 156         }
 157         if (!st) {
 158             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 159                    "matches no streams.\n", p, fg->graph_desc);
 160             exit_program(1);
 161         }
 162         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 163     } else {
 164         /* find the first unused stream of corresponding type */
 165         for (i = 0; i < nb_input_streams; i++) {
 166             ist = input_streams[i];
 167             if (ist->st->codec->codec_type == type && ist->discard)
 168                 break;
 169         }
 170         if (i == nb_input_streams) {
 171             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 172                    "unlabeled input pad %d on filter %s", in->pad_idx,
 173                    in->filter_ctx->name);
 174             exit_program(1);
 175         }
 176     }
 177     av_assert0(ist);
 178
 179     ist->discard         = 0;
 180     ist->decoding_needed = 1;
 181     ist->st->discard = AVDISCARD_NONE;
 182
 183     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
 184                             &fg->nb_inputs, fg->nb_inputs + 1);
 185     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 186         exit_program(1);
 187     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 188     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 189
 190     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 191                               &ist->nb_filters, ist->nb_filters + 1);
 192     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 193 }
 194
 195 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 196 {
 197     char *pix_fmts;
 198     OutputStream *ost = ofilter->ost;
 199     AVCodecContext *codec = ost->st->codec;
 200     AVFilterContext *last_filter = out->filter_ctx;
 201     int pad_idx = out->pad_idx;
 202     int ret;
 203     char name[255];
 204
 205     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 206     ret = avfilter_graph_create_filter(&ofilter->filter,
 207                                        avfilter_get_by_name("buffersink"),
 208                                        name, NULL, pix_fmts, fg->graph);
 209     if (ret < 0)
 210         return ret;
 211
 212     if (codec->width || codec->height) {
 213         char args[255];
 214         AVFilterContext *filter;
 215
 216         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 217                  codec->width,
 218                  codec->height,
 219                  (unsigned)ost->sws_flags);
 220         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 221                  ost->file_index, ost->index);
 222         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 223                                                 name, args, NULL, fg->graph)) < 0)
 224             return ret;
 225         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 226             return ret;
 227
 228         last_filter = filter;
 229         pad_idx = 0;
 230     }
 231
 232     if ((pix_fmts = choose_pix_fmts(ost))) {
 233         AVFilterContext *filter;
 234         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 235                  ost->file_index, ost->index);
 236         if ((ret = avfilter_graph_create_filter(&filter,
 237                                                 avfilter_get_by_name("format"),
 238                                                 "format", pix_fmts, NULL,
 239                                                 fg->graph)) < 0)
 240             return ret;
 241         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 242             return ret;
 243
 244         last_filter = filter;
 245         pad_idx     = 0;
 246         av_freep(&pix_fmts);
 247     }
 248
 249     if (ost->frame_rate.num) {
 250         AVFilterContext *fps;
 251         char args[255];
 252
 253         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 254                  ost->frame_rate.den);
 255         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 256                  ost->file_index, ost->index);
 257         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 258                                            name, args, NULL, fg->graph);
 259         if (ret < 0)
 260             return ret;
 261
 262         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 263         if (ret < 0)
 264             return ret;
 265         last_filter = fps;
 266         pad_idx = 0;
 267     }
 268
 269     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 270         return ret;
 271
 272     return 0;
 273 }
 274
 275 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 276 {
 277     OutputStream *ost = ofilter->ost;
 278     AVCodecContext *codec  = ost->st->codec;
 279     AVFilterContext *last_filter = out->filter_ctx;
 280     int pad_idx = out->pad_idx;
 281     char *sample_fmts, *sample_rates, *channel_layouts;
 282     char name[255];
 283     int ret;
 284
 285
 286     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 287     ret = avfilter_graph_create_filter(&ofilter->filter,
 288                                        avfilter_get_by_name("abuffersink"),
 289                                        name, NULL, NULL, fg->graph);
 290     if (ret < 0)
 291         return ret;
 292
 293     if (codec->channels && !codec->channel_layout)
 294         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 295
 296     sample_fmts     = choose_sample_fmts(ost);
 297     sample_rates    = choose_sample_rates(ost);
 298     channel_layouts = choose_channel_layouts(ost);
 299     if (sample_fmts || sample_rates || channel_layouts) {
 300         AVFilterContext *format;
 301         char args[256];
 302         int len = 0;
 303
 304         if (sample_fmts)
 305             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
 306                             sample_fmts);
 307         if (sample_rates)
 308             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
 309                             sample_rates);
 310         if (channel_layouts)
 311             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
 312                             channel_layouts);
 313         args[len - 1] = 0;
 314
 315         av_freep(&sample_fmts);
 316         av_freep(&sample_rates);
 317         av_freep(&channel_layouts);
 318
 319         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 320                  ost->file_index, ost->index);
 321         ret = avfilter_graph_create_filter(&format,
 322                                            avfilter_get_by_name("aformat"),
 323                                            name, args, NULL, fg->graph);
 324         if (ret < 0)
 325             return ret;
 326
 327         ret = avfilter_link(last_filter, pad_idx, format, 0);
 328         if (ret < 0)
 329             return ret;
 330
 331         last_filter = format;
 332         pad_idx = 0;
 333     }
 334
 335     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 336         return ret;
 337
 338     return 0;
 339 }
 340
 341 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 342 {                                                                  \
 343     AVFilterContext *ctx = inout->filter_ctx;                      \
 344     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 345     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 346     AVIOContext *pb;                                               \
 347                                                                    \
 348     if (avio_open_dyn_buf(&pb) < 0)                                \
 349         exit_program(1);                                           \
 350                                                                    \
 351     avio_printf(pb, "%s", ctx->filter->name);                      \
 352     if (nb_pads > 1)                                               \
 353         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 354     avio_w8(pb, 0);                                                \
 355     avio_close_dyn_buf(pb, &f->name);                              \
 356 }
 357
 358 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 359 {
 360     av_freep(&ofilter->name);
 361     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 362
 363     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 364     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 365     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 366     default: av_assert0(0);
 367     }
 368 }
 369
 370 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 371                                         AVFilterInOut *in)
 372 {
 373     AVFilterContext *first_filter = in->filter_ctx;
 374     AVFilter *filter = avfilter_get_by_name("buffer");
 375     InputStream *ist = ifilter->ist;
 376     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 377                                          ist->st->time_base;
 378     AVRational sar;
 379     char args[255], name[255];
 380     int pad_idx = in->pad_idx;
 381     int ret;
 382
 383     sar = ist->st->sample_aspect_ratio.num ?
 384           ist->st->sample_aspect_ratio :
 385           ist->st->codec->sample_aspect_ratio;
 386     snprintf(args, sizeof(args), "%d:%d:%d:%d:%d:%d:%d", ist->st->codec->width,
 387              ist->st->codec->height, ist->st->codec->pix_fmt,
 388              tb.num, tb.den, sar.num, sar.den);
 389     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 390              ist->file_index, ist->st->index);
 391
 392     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 393                                             args, NULL, fg->graph)) < 0)
 394         return ret;
 395
 396     if (ist->framerate.num) {
 397         AVFilterContext *setpts;
 398
 399         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 400                  ist->file_index, ist->st->index);
 401         if ((ret = avfilter_graph_create_filter(&setpts,
 402                                                 avfilter_get_by_name("setpts"),
 403                                                 name, "N", NULL,
 404                                                 fg->graph)) < 0)
 405             return ret;
 406
 407         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 408             return ret;
 409
 410         first_filter = setpts;
 411         pad_idx = 0;
 412     }
 413
 414     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 415         return ret;
 416     return 0;
 417 }
 418
 419 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 420                                         AVFilterInOut *in)
 421 {
 422     AVFilterContext *first_filter = in->filter_ctx;
 423     AVFilter *filter = avfilter_get_by_name("abuffer");
 424     InputStream *ist = ifilter->ist;
 425     int pad_idx = in->pad_idx;
 426     char args[255], name[255];
 427     int ret;
 428
 429     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
 430              ":channel_layout=0x%"PRIx64,
 431              1, ist->st->codec->sample_rate,
 432              ist->st->codec->sample_rate,
 433              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
 434              ist->st->codec->channel_layout);
 435     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 436              ist->file_index, ist->st->index);
 437
 438     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 439                                             name, args, NULL,
 440                                             fg->graph)) < 0)
 441         return ret;
 442
 443     if (audio_sync_method > 0) {
 444         AVFilterContext *async;
 445         char args[256];
 446         int  len = 0;
 447
 448         av_log(NULL, AV_LOG_WARNING, "-async has been deprecated. Used the "
 449                "asyncts audio filter instead.\n");
 450
 451         if (audio_sync_method > 1)
 452             len += snprintf(args + len, sizeof(args) - len, "compensate=1:"
 453                             "max_comp=%d:", audio_sync_method);
 454         snprintf(args + len, sizeof(args) - len, "min_delta=%f",
 455                  audio_drift_threshold);
 456
 457         snprintf(name, sizeof(name), "graph %d audio sync for input stream %d:%d",
 458                  fg->index, ist->file_index, ist->st->index);
 459         ret = avfilter_graph_create_filter(&async,
 460                                            avfilter_get_by_name("asyncts"),
 461                                            name, args, NULL, fg->graph);
 462         if (ret < 0)
 463             return ret;
 464
 465         ret = avfilter_link(async, 0, first_filter, pad_idx);
 466         if (ret < 0)
 467             return ret;
 468
 469         first_filter = async;
 470         pad_idx = 0;
 471     }
 472     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 473         return ret;
 474
 475     return 0;
 476 }
 477
 478 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 479                                   AVFilterInOut *in)
 480 {
 481     av_freep(&ifilter->name);
 482     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 483
 484     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 485     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 486     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 487     default: av_assert0(0);
 488     }
 489 }
 490
 491 int configure_filtergraph(FilterGraph *fg)
 492 {
 493     AVFilterInOut *inputs, *outputs, *cur;
 494     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 495     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 496                                       fg->graph_desc;
 497
 498     avfilter_graph_free(&fg->graph);
 499     if (!(fg->graph = avfilter_graph_alloc()))
 500         return AVERROR(ENOMEM);
 501
 502     if (simple) {
 503         OutputStream *ost = fg->outputs[0]->ost;
 504         char args[255];
 505         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 506         fg->graph->scale_sws_opts = av_strdup(args);
 507     }
 508
 509     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 510         return ret;
 511
 512     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 513         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 514                "exactly one input and output.\n", graph_desc);
 515         return AVERROR(EINVAL);
 516     }
 517
 518     for (cur = inputs; !simple && init && cur; cur = cur->next)
 519         init_input_filter(fg, cur);
 520
 521     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 522         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 523             return ret;
 524     avfilter_inout_free(&inputs);
 525
 526     if (!init || simple) {
 527         /* we already know the mappings between lavfi outputs and output streams,
 528          * so we can finish the setup */
 529         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 530             configure_output_filter(fg, fg->outputs[i], cur);
 531         avfilter_inout_free(&outputs);
 532
 533         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 534             return ret;
 535     } else {
 536         /* wait until output mappings are processed */
 537         for (cur = outputs; cur;) {
 538             fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
 539                                      &fg->nb_outputs, fg->nb_outputs + 1);
 540             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 541                 exit_program(1);
 542             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 543             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 544             cur = cur->next;
 545             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 546         }
 547     }
 548
 549     return 0;
 550 }
 551
 552 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 553 {
 554     int i;
 555     for (i = 0; i < fg->nb_inputs; i++)
 556         if (fg->inputs[i]->ist == ist)
 557             return 1;
 558     return 0;
 559 }
 560