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: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     OutputFile *of = output_files[ost->file_index];
 428     int pad_idx = out->pad_idx;
 429     char *sample_fmts, *sample_rates, *channel_layouts;
 430     char name[255];
 431     int ret;
 432
 433     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 434     ret = avfilter_graph_create_filter(&ofilter->filter,
 435                                        avfilter_get_by_name("abuffersink"),
 436                                        name, NULL, NULL, fg->graph);
 437     if (ret < 0)
 438         return ret;
 439     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 440         return ret;
 441
 442 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 443     AVFilterContext *filt_ctx;                                              \
 444                                                                             \
 445     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 446            "similarly to -af " filter_name "=%s.\n", arg);                  \
 447                                                                             \
 448     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 449                                        avfilter_get_by_name(filter_name),   \
 450                                        filter_name, arg, NULL, fg->graph);  \
 451     if (ret < 0)                                                            \
 452         return ret;                                                         \
 453                                                                             \
 454     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 455     if (ret < 0)                                                            \
 456         return ret;                                                         \
 457                                                                             \
 458     last_filter = filt_ctx;                                                 \
 459     pad_idx = 0;                                                            \
 460 } while (0)
 461     if (ost->audio_channels_mapped) {
 462         int i;
 463         AVBPrint pan_buf;
 464         av_bprint_init(&pan_buf, 256, 8192);
 465         av_bprintf(&pan_buf, "0x%"PRIx64,
 466                    av_get_default_channel_layout(ost->audio_channels_mapped));
 467         for (i = 0; i < ost->audio_channels_mapped; i++)
 468             if (ost->audio_channels_map[i] != -1)
 469                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 470
 471         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 472         av_bprint_finalize(&pan_buf, NULL);
 473     }
 474
 475     if (codec->channels && !codec->channel_layout)
 476         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 477
 478     sample_fmts     = choose_sample_fmts(ost);
 479     sample_rates    = choose_sample_rates(ost);
 480     channel_layouts = choose_channel_layouts(ost);
 481     if (sample_fmts || sample_rates || channel_layouts) {
 482         AVFilterContext *format;
 483         char args[256];
 484         args[0] = 0;
 485
 486         if (sample_fmts)
 487             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 488                             sample_fmts);
 489         if (sample_rates)
 490             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 491                             sample_rates);
 492         if (channel_layouts)
 493             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 494                             channel_layouts);
 495
 496         av_freep(&sample_fmts);
 497         av_freep(&sample_rates);
 498         av_freep(&channel_layouts);
 499
 500         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 501                  ost->file_index, ost->index);
 502         ret = avfilter_graph_create_filter(&format,
 503                                            avfilter_get_by_name("aformat"),
 504                                            name, args, NULL, fg->graph);
 505         if (ret < 0)
 506             return ret;
 507
 508         ret = avfilter_link(last_filter, pad_idx, format, 0);
 509         if (ret < 0)
 510             return ret;
 511
 512         last_filter = format;
 513         pad_idx = 0;
 514     }
 515
 516     if (audio_volume != 256 && 0) {
 517         char args[256];
 518
 519         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 520         AUTO_INSERT_FILTER("-vol", "volume", args);
 521     }
 522
 523     if (ost->apad && of->shortest) {
 524         char args[256];
 525         int i;
 526
 527         for (i=0; i<of->ctx->nb_streams; i++)
 528             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 529                 break;
 530
 531         if (i<of->ctx->nb_streams) {
 532             snprintf(args, sizeof(args), "%s", ost->apad);
 533             AUTO_INSERT_FILTER("-apad", "apad", args);
 534         }
 535     }
 536
 537     ret = insert_trim(ost, &last_filter, &pad_idx);
 538     if (ret < 0)
 539         return ret;
 540
 541     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 542         return ret;
 543
 544     return 0;
 545 }
 546
 547 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 548 {                                                                  \
 549     AVFilterContext *ctx = inout->filter_ctx;                      \
 550     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 551     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 552     AVIOContext *pb;                                               \
 553                                                                    \
 554     if (avio_open_dyn_buf(&pb) < 0)                                \
 555         exit(1);                                                   \
 556                                                                    \
 557     avio_printf(pb, "%s", ctx->filter->name);                      \
 558     if (nb_pads > 1)                                               \
 559         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 560     avio_w8(pb, 0);                                                \
 561     avio_close_dyn_buf(pb, &f->name);                              \
 562 }
 563
 564 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 565 {
 566     av_freep(&ofilter->name);
 567     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 568
 569     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 570     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 571     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 572     default: av_assert0(0);
 573     }
 574 }
 575
 576 static int sub2video_prepare(InputStream *ist)
 577 {
 578     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 579     int i, w, h;
 580
 581     /* Compute the size of the canvas for the subtitles stream.
 582        If the subtitles codec has set a size, use it. Otherwise use the
 583        maximum dimensions of the video streams in the same file. */
 584     w = ist->st->codec->width;
 585     h = ist->st->codec->height;
 586     if (!(w && h)) {
 587         for (i = 0; i < avf->nb_streams; i++) {
 588             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 589                 w = FFMAX(w, avf->streams[i]->codec->width);
 590                 h = FFMAX(h, avf->streams[i]->codec->height);
 591             }
 592         }
 593         if (!(w && h)) {
 594             w = FFMAX(w, 720);
 595             h = FFMAX(h, 576);
 596         }
 597         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 598     }
 599     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
 600     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
 601
 602     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 603        palettes for all rectangles are identical or compatible */
 604     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 605
 606     ist->sub2video.frame = av_frame_alloc();
 607     if (!ist->sub2video.frame)
 608         return AVERROR(ENOMEM);
 609     return 0;
 610 }
 611
 612 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 613                                         AVFilterInOut *in)
 614 {
 615     AVFilterContext *first_filter = in->filter_ctx;
 616     AVFilter *filter = avfilter_get_by_name("buffer");
 617     InputStream *ist = ifilter->ist;
 618     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 619                                          ist->st->time_base;
 620     AVRational fr = ist->framerate;
 621     AVRational sar;
 622     AVBPrint args;
 623     char name[255];
 624     int pad_idx = in->pad_idx;
 625     int ret;
 626
 627     if (!fr.num)
 628         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 629
 630     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 631         ret = sub2video_prepare(ist);
 632         if (ret < 0)
 633             return ret;
 634     }
 635
 636     sar = ist->st->sample_aspect_ratio.num ?
 637           ist->st->sample_aspect_ratio :
 638           ist->st->codec->sample_aspect_ratio;
 639     if(!sar.den)
 640         sar = (AVRational){0,1};
 641     av_bprint_init(&args, 0, 1);
 642     av_bprintf(&args,
 643              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 644              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 645              ist->resample_height, ist->resample_pix_fmt,
 646              tb.num, tb.den, sar.num, sar.den,
 647              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 648     if (fr.num && fr.den)
 649         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 650     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 651              ist->file_index, ist->st->index);
 652
 653     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 654                                             args.str, NULL, fg->graph)) < 0)
 655         return ret;
 656
 657     if (ist->framerate.num) {
 658         AVFilterContext *setpts;
 659
 660         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 661                  ist->file_index, ist->st->index);
 662         if ((ret = avfilter_graph_create_filter(&setpts,
 663                                                 avfilter_get_by_name("setpts"),
 664                                                 name, "N", NULL,
 665                                                 fg->graph)) < 0)
 666             return ret;
 667
 668         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 669             return ret;
 670
 671         first_filter = setpts;
 672         pad_idx = 0;
 673     }
 674
 675     if (do_deinterlace) {
 676         AVFilterContext *yadif;
 677
 678         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 679                  ist->file_index, ist->st->index);
 680         if ((ret = avfilter_graph_create_filter(&yadif,
 681                                                 avfilter_get_by_name("yadif"),
 682                                                 name, "", NULL,
 683                                                 fg->graph)) < 0)
 684             return ret;
 685
 686         if ((ret = avfilter_link(yadif, 0, first_filter, pad_idx)) < 0)
 687             return ret;
 688
 689         first_filter = yadif;
 690         pad_idx = 0;
 691     }
 692
 693     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 694         return ret;
 695     return 0;
 696 }
 697
 698 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 699                                         AVFilterInOut *in)
 700 {
 701     AVFilterContext *first_filter = in->filter_ctx;
 702     AVFilter *filter = avfilter_get_by_name("abuffer");
 703     InputStream *ist = ifilter->ist;
 704     int pad_idx = in->pad_idx;
 705     AVBPrint args;
 706     char name[255];
 707     int ret;
 708
 709     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 710     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 711              1, ist->st->codec->sample_rate,
 712              ist->st->codec->sample_rate,
 713              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 714     if (ist->st->codec->channel_layout)
 715         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 716                    ist->st->codec->channel_layout);
 717     else
 718         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 719     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 720              ist->file_index, ist->st->index);
 721
 722     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 723                                             name, args.str, NULL,
 724                                             fg->graph)) < 0)
 725         return ret;
 726
 727 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 728     AVFilterContext *filt_ctx;                                              \
 729                                                                             \
 730     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 731            "similarly to -af " filter_name "=%s.\n", arg);                  \
 732                                                                             \
 733     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 734                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 735     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 736                                        avfilter_get_by_name(filter_name),   \
 737                                        name, arg, NULL, fg->graph);         \
 738     if (ret < 0)                                                            \
 739         return ret;                                                         \
 740                                                                             \
 741     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 742     if (ret < 0)                                                            \
 743         return ret;                                                         \
 744                                                                             \
 745     first_filter = filt_ctx;                                                  \
 746 } while (0)
 747
 748     if (audio_sync_method > 0) {
 749         char args[256] = {0};
 750
 751         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 752         if (audio_drift_threshold != 0.1)
 753             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 754         if (!fg->reconfiguration)
 755             av_strlcatf(args, sizeof(args), ":first_pts=0");
 756         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 757     }
 758
 759 //     if (ost->audio_channels_mapped) {
 760 //         int i;
 761 //         AVBPrint pan_buf;
 762 //         av_bprint_init(&pan_buf, 256, 8192);
 763 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 764 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 765 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 766 //             if (ost->audio_channels_map[i] != -1)
 767 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 768 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 769 //         av_bprint_finalize(&pan_buf, NULL);
 770 //     }
 771
 772     if (audio_volume != 256) {
 773         char args[256];
 774
 775         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 776                "audio filter instead.\n");
 777
 778         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 779         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 780     }
 781     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 782         return ret;
 783
 784     return 0;
 785 }
 786
 787 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 788                                   AVFilterInOut *in)
 789 {
 790     av_freep(&ifilter->name);
 791     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 792
 793     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 794     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 795     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 796     default: av_assert0(0);
 797     }
 798 }
 799
 800 int configure_filtergraph(FilterGraph *fg)
 801 {
 802     AVFilterInOut *inputs, *outputs, *cur;
 803     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 804     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 805                                       fg->graph_desc;
 806
 807     avfilter_graph_free(&fg->graph);
 808     if (!(fg->graph = avfilter_graph_alloc()))
 809         return AVERROR(ENOMEM);
 810
 811     if (simple) {
 812         OutputStream *ost = fg->outputs[0]->ost;
 813         char args[512];
 814         AVDictionaryEntry *e = NULL;
 815
 816         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 817         fg->graph->scale_sws_opts = av_strdup(args);
 818
 819         args[0] = 0;
 820         while ((e = av_dict_get(ost->swr_opts, "", e,
 821                                 AV_DICT_IGNORE_SUFFIX))) {
 822             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 823         }
 824         if (strlen(args))
 825             args[strlen(args)-1] = 0;
 826         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 827
 828         args[0] = '\0';
 829         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 830                                 AV_DICT_IGNORE_SUFFIX))) {
 831             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 832         }
 833         if (strlen(args))
 834             args[strlen(args) - 1] = '\0';
 835         fg->graph->resample_lavr_opts = av_strdup(args);
 836     }
 837
 838     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 839         return ret;
 840
 841     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 842         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 843                "exactly one input and output.\n", graph_desc);
 844         return AVERROR(EINVAL);
 845     }
 846
 847     for (cur = inputs; !simple && init && cur; cur = cur->next)
 848         init_input_filter(fg, cur);
 849
 850     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 851         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 852             return ret;
 853     avfilter_inout_free(&inputs);
 854
 855     if (!init || simple) {
 856         /* we already know the mappings between lavfi outputs and output streams,
 857          * so we can finish the setup */
 858         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 859             configure_output_filter(fg, fg->outputs[i], cur);
 860         avfilter_inout_free(&outputs);
 861
 862         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 863             return ret;
 864     } else {
 865         /* wait until output mappings are processed */
 866         for (cur = outputs; cur;) {
 867             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 868             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 869                 exit(1);
 870             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 871             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 872             cur = cur->next;
 873             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 874         }
 875     }
 876
 877     fg->reconfiguration = 1;
 878     return 0;
 879 }
 880
 881 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 882 {
 883     int i;
 884     for (i = 0; i < fg->nb_inputs; i++)
 885         if (fg->inputs[i]->ist == ist)
 886             return 1;
 887     return 0;
 888 }
 889