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