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