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