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