git.sesse.net Git - ffmpeg/blob - ffmpeg_filter.c

   1 /*
   2  * ffmpeg filter configuration
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include "ffmpeg.h"
  22
  23 #include "libavfilter/avfilter.h"
  24 #include "libavfilter/buffersink.h"
  25
  26 #include "libavresample/avresample.h"
  27
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avstring.h"
  30 #include "libavutil/bprint.h"
  31 #include "libavutil/channel_layout.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "libavutil/pixfmt.h"
  35 #include "libavutil/imgutils.h"
  36 #include "libavutil/samplefmt.h"
  37
  38 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  39 {
  40     if (codec && codec->pix_fmts) {
  41         const enum AVPixelFormat *p = codec->pix_fmts;
  42         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  43         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  44         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  45         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  46             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  47                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  48             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  49                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  50                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  51             }
  52         }
  53         for (; *p != AV_PIX_FMT_NONE; p++) {
  54             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  55             if (*p == target)
  56                 break;
  57         }
  58         if (*p == AV_PIX_FMT_NONE) {
  59             if (target != AV_PIX_FMT_NONE)
  60                 av_log(NULL, AV_LOG_WARNING,
  61                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  62                        av_get_pix_fmt_name(target),
  63                        codec->name,
  64                        av_get_pix_fmt_name(best));
  65             return best;
  66         }
  67     }
  68     return target;
  69 }
  70
  71 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  72 {
  73     if (codec && codec->sample_fmts) {
  74         const enum AVSampleFormat *p = codec->sample_fmts;
  75         for (; *p != -1; p++) {
  76             if (*p == st->codec->sample_fmt)
  77                 break;
  78         }
  79         if (*p == -1) {
  80             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  81                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  82             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  83             av_log(NULL, AV_LOG_WARNING,
  84                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  85                    av_get_sample_fmt_name(st->codec->sample_fmt),
  86                    codec->name,
  87                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  88             st->codec->sample_fmt = codec->sample_fmts[0];
  89         }
  90     }
  91 }
  92
  93 static char *choose_pix_fmts(OutputStream *ost)
  94 {
  95      if (ost->keep_pix_fmt) {
  96         if (ost->filter)
  97             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  98                                             AVFILTER_AUTO_CONVERT_NONE);
  99         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
 100             return NULL;
 101         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 102     }
 103     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 104         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 105     } else if (ost->enc && ost->enc->pix_fmts) {
 106         const enum AVPixelFormat *p;
 107         AVIOContext *s = NULL;
 108         uint8_t *ret;
 109         int len;
 110
 111         if (avio_open_dyn_buf(&s) < 0)
 112             exit(1);
 113
 114         p = ost->enc->pix_fmts;
 115         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 116             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 117                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 118             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 119                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 120                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 121             }
 122         }
 123
 124         for (; *p != AV_PIX_FMT_NONE; p++) {
 125             const char *name = av_get_pix_fmt_name(*p);
 126             avio_printf(s, "%s|", name);
 127         }
 128         len = avio_close_dyn_buf(s, &ret);
 129         ret[len - 1] = 0;
 130         return ret;
 131     } else
 132         return NULL;
 133 }
 134
 135 /* Define a function for building a string containing a list of
 136  * allowed formats. */
 137 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 138 static char *choose_ ## var ## s(OutputStream *ost)                            \
 139 {                                                                              \
 140     if (ost->st->codec->var != none) {                                         \
 141         get_name(ost->st->codec->var);                                         \
 142         return av_strdup(name);                                                \
 143     } else if (ost->enc && ost->enc->supported_list) {                         \
 144         const type *p;                                                         \
 145         AVIOContext *s = NULL;                                                 \
 146         uint8_t *ret;                                                          \
 147         int len;                                                               \
 148                                                                                \
 149         if (avio_open_dyn_buf(&s) < 0)                                         \
 150             exit(1);                                                           \
 151                                                                                \
 152         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 153             get_name(*p);                                                      \
 154             avio_printf(s, "%s|", name);                                       \
 155         }                                                                      \
 156         len = avio_close_dyn_buf(s, &ret);                                     \
 157         ret[len - 1] = 0;                                                      \
 158         return ret;                                                            \
 159     } else                                                                     \
 160         return NULL;                                                           \
 161 }
 162
 163 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 164 //                   GET_PIX_FMT_NAME)
 165
 166 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 167                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 168
 169 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 170                   GET_SAMPLE_RATE_NAME)
 171
 172 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 173                   GET_CH_LAYOUT_NAME)
 174
 175 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 176 {
 177     FilterGraph *fg = av_mallocz(sizeof(*fg));
 178
 179     if (!fg)
 180         exit(1);
 181     fg->index = nb_filtergraphs;
 182
 183     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 184     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 185         exit(1);
 186     fg->outputs[0]->ost   = ost;
 187     fg->outputs[0]->graph = fg;
 188
 189     ost->filter = fg->outputs[0];
 190
 191     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 192     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 193         exit(1);
 194     fg->inputs[0]->ist   = ist;
 195     fg->inputs[0]->graph = fg;
 196
 197     GROW_ARRAY(ist->filters, ist->nb_filters);
 198     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 199
 200     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 201     filtergraphs[nb_filtergraphs - 1] = fg;
 202
 203     return fg;
 204 }
 205
 206 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 207 {
 208     InputStream *ist = NULL;
 209     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 210     int i;
 211
 212     // TODO: support other filter types
 213     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 214         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 215                "currently.\n");
 216         exit(1);
 217     }
 218
 219     if (in->name) {
 220         AVFormatContext *s;
 221         AVStream       *st = NULL;
 222         char *p;
 223         int file_idx = strtol(in->name, &p, 0);
 224
 225         if (file_idx < 0 || file_idx >= nb_input_files) {
 226             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 227                    file_idx, fg->graph_desc);
 228             exit(1);
 229         }
 230         s = input_files[file_idx]->ctx;
 231
 232         for (i = 0; i < s->nb_streams; i++) {
 233             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 234             if (stream_type != type &&
 235                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 236                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 237                 continue;
 238             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 239                 st = s->streams[i];
 240                 break;
 241             }
 242         }
 243         if (!st) {
 244             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 245                    "matches no streams.\n", p, fg->graph_desc);
 246             exit(1);
 247         }
 248         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 249     } else {
 250         /* find the first unused stream of corresponding type */
 251         for (i = 0; i < nb_input_streams; i++) {
 252             ist = input_streams[i];
 253             if (ist->st->codec->codec_type == type && ist->discard)
 254                 break;
 255         }
 256         if (i == nb_input_streams) {
 257             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 258                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 259                    in->filter_ctx->name);
 260             exit(1);
 261         }
 262     }
 263     av_assert0(ist);
 264
 265     ist->discard         = 0;
 266     ist->decoding_needed++;
 267     ist->st->discard = AVDISCARD_NONE;
 268
 269     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 270     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 271         exit(1);
 272     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 273     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 274
 275     GROW_ARRAY(ist->filters, ist->nb_filters);
 276     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 277 }
 278
 279 static int insert_trim(OutputStream *ost, AVFilterContext **last_filter, int *pad_idx)
 280 {
 281     OutputFile *of = output_files[ost->file_index];
 282     AVFilterGraph *graph = (*last_filter)->graph;
 283     AVFilterContext *ctx;
 284     const AVFilter *trim;
 285     const char *name = ost->st->codec->codec_type == AVMEDIA_TYPE_VIDEO ? "trim" : "atrim";
 286     char filter_name[128];
 287     int ret = 0;
 288
 289     if (of->recording_time == INT64_MAX && !of->start_time)
 290         return 0;
 291
 292     // Use with duration and without output starttime is buggy with trim filters
 293     if (!of->start_time)
 294         return 0;
 295
 296     trim = avfilter_get_by_name(name);
 297     if (!trim) {
 298         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 299                "recording time.\n", name);
 300         return AVERROR_FILTER_NOT_FOUND;
 301     }
 302
 303     snprintf(filter_name, sizeof(filter_name), "%s for output stream %d:%d",
 304              name, ost->file_index, ost->index);
 305     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 306     if (!ctx)
 307         return AVERROR(ENOMEM);
 308
 309     if (of->recording_time != INT64_MAX) {
 310         ret = av_opt_set_double(ctx, "duration", (double)of->recording_time / 1e6,
 311                                 AV_OPT_SEARCH_CHILDREN);
 312     }
 313     if (ret >= 0 && of->start_time) {
 314         ret = av_opt_set_double(ctx, "start", (double)of->start_time / 1e6,
 315                                 AV_OPT_SEARCH_CHILDREN);
 316     }
 317     if (ret < 0) {
 318         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 319         return ret;
 320     }
 321
 322     ret = avfilter_init_str(ctx, NULL);
 323     if (ret < 0)
 324         return ret;
 325
 326     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 327     if (ret < 0)
 328         return ret;
 329
 330     *last_filter = ctx;
 331     *pad_idx     = 0;
 332     return 0;
 333 }
 334
 335 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 336 {
 337     char *pix_fmts;
 338     OutputStream *ost = ofilter->ost;
 339     AVCodecContext *codec = ost->st->codec;
 340     AVFilterContext *last_filter = out->filter_ctx;
 341     int pad_idx = out->pad_idx;
 342     int ret;
 343     char name[255];
 344
 345     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 346     ret = avfilter_graph_create_filter(&ofilter->filter,
 347                                        avfilter_get_by_name("buffersink"),
 348                                        name, NULL, NULL, fg->graph);
 349
 350     if (ret < 0)
 351         return ret;
 352
 353     if (codec->width || codec->height) {
 354         char args[255];
 355         AVFilterContext *filter;
 356
 357         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 358                  codec->width,
 359                  codec->height,
 360                  (unsigned)ost->sws_flags);
 361         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 362                  ost->file_index, ost->index);
 363         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 364                                                 name, args, NULL, fg->graph)) < 0)
 365             return ret;
 366         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 367             return ret;
 368
 369         last_filter = filter;
 370         pad_idx = 0;
 371     }
 372
 373     if ((pix_fmts = choose_pix_fmts(ost))) {
 374         AVFilterContext *filter;
 375         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 376                  ost->file_index, ost->index);
 377         ret = avfilter_graph_create_filter(&filter,
 378                                                 avfilter_get_by_name("format"),
 379                                                 "format", pix_fmts, NULL,
 380                                                 fg->graph);
 381         av_freep(&pix_fmts);
 382         if (ret < 0)
 383             return ret;
 384         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 385             return ret;
 386
 387         last_filter = filter;
 388         pad_idx     = 0;
 389     }
 390
 391     if (ost->frame_rate.num && 0) {
 392         AVFilterContext *fps;
 393         char args[255];
 394
 395         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 396                  ost->frame_rate.den);
 397         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 398                  ost->file_index, ost->index);
 399         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 400                                            name, args, NULL, fg->graph);
 401         if (ret < 0)
 402             return ret;
 403
 404         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 405         if (ret < 0)
 406             return ret;
 407         last_filter = fps;
 408         pad_idx = 0;
 409     }
 410
 411     ret = insert_trim(ost, &last_filter, &pad_idx);
 412     if (ret < 0)
 413         return ret;
 414
 415
 416     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 417         return ret;
 418
 419     return 0;
 420 }
 421
 422 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 423 {
 424     OutputStream *ost = ofilter->ost;
 425     AVCodecContext *codec  = ost->st->codec;
 426     AVFilterContext *last_filter = out->filter_ctx;
 427     int pad_idx = out->pad_idx;
 428     char *sample_fmts, *sample_rates, *channel_layouts;
 429     char name[255];
 430     int ret;
 431
 432     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 433     ret = avfilter_graph_create_filter(&ofilter->filter,
 434                                        avfilter_get_by_name("abuffersink"),
 435                                        name, NULL, NULL, fg->graph);
 436     if (ret < 0)
 437         return ret;
 438     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 439         return ret;
 440
 441 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 442     AVFilterContext *filt_ctx;                                              \
 443                                                                             \
 444     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 445            "similarly to -af " filter_name "=%s.\n", arg);                  \
 446                                                                             \
 447     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 448                                        avfilter_get_by_name(filter_name),   \
 449                                        filter_name, arg, NULL, fg->graph);  \
 450     if (ret < 0)                                                            \
 451         return ret;                                                         \
 452                                                                             \
 453     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 454     if (ret < 0)                                                            \
 455         return ret;                                                         \
 456                                                                             \
 457     last_filter = filt_ctx;                                                 \
 458     pad_idx = 0;                                                            \
 459 } while (0)
 460     if (ost->audio_channels_mapped) {
 461         int i;
 462         AVBPrint pan_buf;
 463         av_bprint_init(&pan_buf, 256, 8192);
 464         av_bprintf(&pan_buf, "0x%"PRIx64,
 465                    av_get_default_channel_layout(ost->audio_channels_mapped));
 466         for (i = 0; i < ost->audio_channels_mapped; i++)
 467             if (ost->audio_channels_map[i] != -1)
 468                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 469
 470         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 471         av_bprint_finalize(&pan_buf, NULL);
 472     }
 473
 474     if (codec->channels && !codec->channel_layout)
 475         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 476
 477     sample_fmts     = choose_sample_fmts(ost);
 478     sample_rates    = choose_sample_rates(ost);
 479     channel_layouts = choose_channel_layouts(ost);
 480     if (sample_fmts || sample_rates || channel_layouts) {
 481         AVFilterContext *format;
 482         char args[256];
 483         args[0] = 0;
 484
 485         if (sample_fmts)
 486             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 487                             sample_fmts);
 488         if (sample_rates)
 489             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 490                             sample_rates);
 491         if (channel_layouts)
 492             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 493                             channel_layouts);
 494
 495         av_freep(&sample_fmts);
 496         av_freep(&sample_rates);
 497         av_freep(&channel_layouts);
 498
 499         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 500                  ost->file_index, ost->index);
 501         ret = avfilter_graph_create_filter(&format,
 502                                            avfilter_get_by_name("aformat"),
 503                                            name, args, NULL, fg->graph);
 504         if (ret < 0)
 505             return ret;
 506
 507         ret = avfilter_link(last_filter, pad_idx, format, 0);
 508         if (ret < 0)
 509             return ret;
 510
 511         last_filter = format;
 512         pad_idx = 0;
 513     }
 514
 515     if (audio_volume != 256 && 0) {
 516         char args[256];
 517
 518         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 519         AUTO_INSERT_FILTER("-vol", "volume", args);
 520     }
 521
 522     ret = insert_trim(ost, &last_filter, &pad_idx);
 523     if (ret < 0)
 524         return ret;
 525
 526     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 527         return ret;
 528
 529     return 0;
 530 }
 531
 532 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 533 {                                                                  \
 534     AVFilterContext *ctx = inout->filter_ctx;                      \
 535     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 536     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 537     AVIOContext *pb;                                               \
 538                                                                    \
 539     if (avio_open_dyn_buf(&pb) < 0)                                \
 540         exit(1);                                                   \
 541                                                                    \
 542     avio_printf(pb, "%s", ctx->filter->name);                      \
 543     if (nb_pads > 1)                                               \
 544         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 545     avio_w8(pb, 0);                                                \
 546     avio_close_dyn_buf(pb, &f->name);                              \
 547 }
 548
 549 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 550 {
 551     av_freep(&ofilter->name);
 552     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 553
 554     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 555     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 556     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 557     default: av_assert0(0);
 558     }
 559 }
 560
 561 static int sub2video_prepare(InputStream *ist)
 562 {
 563     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 564     int i, w, h;
 565
 566     /* Compute the size of the canvas for the subtitles stream.
 567        If the subtitles codec has set a size, use it. Otherwise use the
 568        maximum dimensions of the video streams in the same file. */
 569     w = ist->st->codec->width;
 570     h = ist->st->codec->height;
 571     if (!(w && h)) {
 572         for (i = 0; i < avf->nb_streams; i++) {
 573             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 574                 w = FFMAX(w, avf->streams[i]->codec->width);
 575                 h = FFMAX(h, avf->streams[i]->codec->height);
 576             }
 577         }
 578         if (!(w && h)) {
 579             w = FFMAX(w, 720);
 580             h = FFMAX(h, 576);
 581         }
 582         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 583     }
 584     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
 585     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
 586
 587     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 588        palettes for all rectangles are identical or compatible */
 589     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 590
 591     ist->sub2video.frame = av_frame_alloc();
 592     if (!ist->sub2video.frame)
 593         return AVERROR(ENOMEM);
 594     return 0;
 595 }
 596
 597 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 598                                         AVFilterInOut *in)
 599 {
 600     AVFilterContext *first_filter = in->filter_ctx;
 601     AVFilter *filter = avfilter_get_by_name("buffer");
 602     InputStream *ist = ifilter->ist;
 603     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 604                                          ist->st->time_base;
 605     AVRational fr = ist->framerate;
 606     AVRational sar;
 607     AVBPrint args;
 608     char name[255];
 609     int pad_idx = in->pad_idx;
 610     int ret;
 611
 612     if (!fr.num)
 613         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 614
 615     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 616         ret = sub2video_prepare(ist);
 617         if (ret < 0)
 618             return ret;
 619     }
 620
 621     sar = ist->st->sample_aspect_ratio.num ?
 622           ist->st->sample_aspect_ratio :
 623           ist->st->codec->sample_aspect_ratio;
 624     if(!sar.den)
 625         sar = (AVRational){0,1};
 626     av_bprint_init(&args, 0, 1);
 627     av_bprintf(&args,
 628              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 629              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 630              ist->resample_height, ist->resample_pix_fmt,
 631              tb.num, tb.den, sar.num, sar.den,
 632              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 633     if (fr.num && fr.den)
 634         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 635     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 636              ist->file_index, ist->st->index);
 637
 638     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 639                                             args.str, NULL, fg->graph)) < 0)
 640         return ret;
 641
 642     if (ist->framerate.num) {
 643         AVFilterContext *setpts;
 644
 645         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 646                  ist->file_index, ist->st->index);
 647         if ((ret = avfilter_graph_create_filter(&setpts,
 648                                                 avfilter_get_by_name("setpts"),
 649                                                 name, "N", NULL,
 650                                                 fg->graph)) < 0)
 651             return ret;
 652
 653         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 654             return ret;
 655
 656         first_filter = setpts;
 657         pad_idx = 0;
 658     }
 659
 660     if (do_deinterlace) {
 661         AVFilterContext *yadif;
 662
 663         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 664                  ist->file_index, ist->st->index);
 665         if ((ret = avfilter_graph_create_filter(&yadif,
 666                                                 avfilter_get_by_name("yadif"),
 667                                                 name, "", NULL,
 668                                                 fg->graph)) < 0)
 669             return ret;
 670
 671         if ((ret = avfilter_link(yadif, 0, first_filter, pad_idx)) < 0)
 672             return ret;
 673
 674         first_filter = yadif;
 675         pad_idx = 0;
 676     }
 677
 678     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 679         return ret;
 680     return 0;
 681 }
 682
 683 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 684                                         AVFilterInOut *in)
 685 {
 686     AVFilterContext *first_filter = in->filter_ctx;
 687     AVFilter *filter = avfilter_get_by_name("abuffer");
 688     InputStream *ist = ifilter->ist;
 689     int pad_idx = in->pad_idx;
 690     AVBPrint args;
 691     char name[255];
 692     int ret;
 693
 694     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 695     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 696              1, ist->st->codec->sample_rate,
 697              ist->st->codec->sample_rate,
 698              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 699     if (ist->st->codec->channel_layout)
 700         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 701                    ist->st->codec->channel_layout);
 702     else
 703         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 704     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 705              ist->file_index, ist->st->index);
 706
 707     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 708                                             name, args.str, NULL,
 709                                             fg->graph)) < 0)
 710         return ret;
 711
 712 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 713     AVFilterContext *filt_ctx;                                              \
 714                                                                             \
 715     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 716            "similarly to -af " filter_name "=%s.\n", arg);                  \
 717                                                                             \
 718     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 719                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 720     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 721                                        avfilter_get_by_name(filter_name),   \
 722                                        name, arg, NULL, fg->graph);         \
 723     if (ret < 0)                                                            \
 724         return ret;                                                         \
 725                                                                             \
 726     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 727     if (ret < 0)                                                            \
 728         return ret;                                                         \
 729                                                                             \
 730     first_filter = filt_ctx;                                                  \
 731 } while (0)
 732
 733     if (audio_sync_method > 0) {
 734         char args[256] = {0};
 735
 736         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 737         if (audio_drift_threshold != 0.1)
 738             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 739         if (!fg->reconfiguration)
 740             av_strlcatf(args, sizeof(args), ":first_pts=0");
 741         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 742     }
 743
 744 //     if (ost->audio_channels_mapped) {
 745 //         int i;
 746 //         AVBPrint pan_buf;
 747 //         av_bprint_init(&pan_buf, 256, 8192);
 748 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 749 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 750 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 751 //             if (ost->audio_channels_map[i] != -1)
 752 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 753 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 754 //         av_bprint_finalize(&pan_buf, NULL);
 755 //     }
 756
 757     if (audio_volume != 256) {
 758         char args[256];
 759
 760         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 761                "audio filter instead.\n");
 762
 763         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 764         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 765     }
 766     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 767         return ret;
 768
 769     return 0;
 770 }
 771
 772 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 773                                   AVFilterInOut *in)
 774 {
 775     av_freep(&ifilter->name);
 776     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 777
 778     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 779     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 780     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 781     default: av_assert0(0);
 782     }
 783 }
 784
 785 int configure_filtergraph(FilterGraph *fg)
 786 {
 787     AVFilterInOut *inputs, *outputs, *cur;
 788     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 789     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 790                                       fg->graph_desc;
 791
 792     avfilter_graph_free(&fg->graph);
 793     if (!(fg->graph = avfilter_graph_alloc()))
 794         return AVERROR(ENOMEM);
 795
 796     if (simple) {
 797         OutputStream *ost = fg->outputs[0]->ost;
 798         char args[512];
 799         AVDictionaryEntry *e = NULL;
 800
 801         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 802         fg->graph->scale_sws_opts = av_strdup(args);
 803
 804         args[0] = 0;
 805         while ((e = av_dict_get(ost->swr_opts, "", e,
 806                                 AV_DICT_IGNORE_SUFFIX))) {
 807             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 808         }
 809         if (strlen(args))
 810             args[strlen(args)-1] = 0;
 811         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 812
 813         args[0] = '\0';
 814         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 815                                 AV_DICT_IGNORE_SUFFIX))) {
 816             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 817         }
 818         if (strlen(args))
 819             args[strlen(args) - 1] = '\0';
 820         fg->graph->resample_lavr_opts = av_strdup(args);
 821     }
 822
 823     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 824         return ret;
 825
 826     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 827         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 828                "exactly one input and output.\n", graph_desc);
 829         return AVERROR(EINVAL);
 830     }
 831
 832     for (cur = inputs; !simple && init && cur; cur = cur->next)
 833         init_input_filter(fg, cur);
 834
 835     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 836         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 837             return ret;
 838     avfilter_inout_free(&inputs);
 839
 840     if (!init || simple) {
 841         /* we already know the mappings between lavfi outputs and output streams,
 842          * so we can finish the setup */
 843         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 844             configure_output_filter(fg, fg->outputs[i], cur);
 845         avfilter_inout_free(&outputs);
 846
 847         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 848             return ret;
 849     } else {
 850         /* wait until output mappings are processed */
 851         for (cur = outputs; cur;) {
 852             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 853             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 854                 exit(1);
 855             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 856             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 857             cur = cur->next;
 858             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 859         }
 860     }
 861
 862     fg->reconfiguration = 1;
 863     return 0;
 864 }
 865
 866 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 867 {
 868     int i;
 869     for (i = 0; i < fg->nb_inputs; i++)
 870         if (fg->inputs[i]->ist == ist)
 871             return 1;
 872     return 0;
 873 }
 874