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/avfiltergraph.h"
  25 #include "libavfilter/buffersink.h"
  26
  27 #include "libavutil/audioconvert.h"
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avstring.h"
  30 #include "libavutil/bprint.h"
  31 #include "libavutil/pixdesc.h"
  32 #include "libavutil/pixfmt.h"
  33 #include "libavutil/imgutils.h"
  34 #include "libavutil/samplefmt.h"
  35
  36 enum PixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum PixelFormat target)
  37 {
  38     if (codec && codec->pix_fmts) {
  39         const enum PixelFormat *p = codec->pix_fmts;
  40         int has_alpha= av_pix_fmt_descriptors[target].nb_components % 2 == 0;
  41         enum PixelFormat best= PIX_FMT_NONE;
  42         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  43             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  44                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE };
  45             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  46                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUV420P,
  47                                                  PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_BGRA, PIX_FMT_NONE };
  48             }
  49         }
  50         for (; *p != PIX_FMT_NONE; p++) {
  51             best= avcodec_find_best_pix_fmt2(best, *p, target, has_alpha, NULL);
  52             if (*p == target)
  53                 break;
  54         }
  55         if (*p == PIX_FMT_NONE) {
  56             if (target != PIX_FMT_NONE)
  57                 av_log(NULL, AV_LOG_WARNING,
  58                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  59                        av_pix_fmt_descriptors[target].name,
  60                        codec->name,
  61                        av_pix_fmt_descriptors[best].name);
  62             return best;
  63         }
  64     }
  65     return target;
  66 }
  67
  68 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  69 {
  70     if (codec && codec->sample_fmts) {
  71         const enum AVSampleFormat *p = codec->sample_fmts;
  72         for (; *p != -1; p++) {
  73             if (*p == st->codec->sample_fmt)
  74                 break;
  75         }
  76         if (*p == -1) {
  77             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  78                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  79             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  80             av_log(NULL, AV_LOG_WARNING,
  81                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  82                    av_get_sample_fmt_name(st->codec->sample_fmt),
  83                    codec->name,
  84                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  85             st->codec->sample_fmt = codec->sample_fmts[0];
  86         }
  87     }
  88 }
  89
  90 static char *choose_pix_fmts(OutputStream *ost)
  91 {
  92      if (ost->keep_pix_fmt) {
  93         if (ost->filter)
  94             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  95                                             AVFILTER_AUTO_CONVERT_NONE);
  96         if (ost->st->codec->pix_fmt == PIX_FMT_NONE)
  97             return NULL;
  98         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
  99     }
 100     if (ost->st->codec->pix_fmt != PIX_FMT_NONE) {
 101         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 102     } else if (ost->enc && ost->enc->pix_fmts) {
 103         const enum PixelFormat *p;
 104         AVIOContext *s = NULL;
 105         uint8_t *ret;
 106         int len;
 107
 108         if (avio_open_dyn_buf(&s) < 0)
 109             exit_program(1);
 110
 111         p = ost->enc->pix_fmts;
 112         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 113             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 114                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUV420P, PIX_FMT_YUV422P, PIX_FMT_NONE };
 115             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 116                 p = (const enum PixelFormat[]) { PIX_FMT_YUVJ420P, PIX_FMT_YUVJ422P, PIX_FMT_YUVJ444P, PIX_FMT_YUV420P,
 117                                                     PIX_FMT_YUV422P, PIX_FMT_YUV444P, PIX_FMT_BGRA, PIX_FMT_NONE };
 118             }
 119         }
 120
 121         for (; *p != PIX_FMT_NONE; p++) {
 122             const char *name = av_get_pix_fmt_name(*p);
 123             avio_printf(s, "%s:", name);
 124         }
 125         len = avio_close_dyn_buf(s, &ret);
 126         ret[len - 1] = 0;
 127         return ret;
 128     } else
 129         return NULL;
 130 }
 131
 132 /**
 133  * Define a function for building a string containing a list of
 134  * allowed formats,
 135  */
 136 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
 137 static char *choose_ ## var ## s(OutputStream *ost)                            \
 138 {                                                                              \
 139     if (ost->st->codec->var != none) {                                         \
 140         get_name(ost->st->codec->var);                                         \
 141         return av_strdup(name);                                                \
 142     } else if (ost->enc->supported_list) {                                     \
 143         const type *p;                                                         \
 144         AVIOContext *s = NULL;                                                 \
 145         uint8_t *ret;                                                          \
 146         int len;                                                               \
 147                                                                                \
 148         if (avio_open_dyn_buf(&s) < 0)                                         \
 149             exit_program(1);                                                   \
 150                                                                                \
 151         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 152             get_name(*p);                                                      \
 153             avio_printf(s, "%s" separator, name);                              \
 154         }                                                                      \
 155         len = avio_close_dyn_buf(s, &ret);                                     \
 156         ret[len - 1] = 0;                                                      \
 157         return ret;                                                            \
 158     } else                                                                     \
 159         return NULL;                                                           \
 160 }
 161
 162 #define GET_PIX_FMT_NAME(pix_fmt)\
 163     const char *name = av_get_pix_fmt_name(pix_fmt);
 164
 165 // DEF_CHOOSE_FORMAT(enum PixelFormat, pix_fmt, pix_fmts, PIX_FMT_NONE,
 166 //                   GET_PIX_FMT_NAME, ":")
 167
 168 #define GET_SAMPLE_FMT_NAME(sample_fmt)\
 169     const char *name = av_get_sample_fmt_name(sample_fmt)
 170
 171 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 172                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
 173
 174 #define GET_SAMPLE_RATE_NAME(rate)\
 175     char name[16];\
 176     snprintf(name, sizeof(name), "%d", rate);
 177
 178 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 179                   GET_SAMPLE_RATE_NAME, ",")
 180
 181 #define GET_CH_LAYOUT_NAME(ch_layout)\
 182     char name[16];\
 183     snprintf(name, sizeof(name), "0x%"PRIx64, ch_layout);
 184
 185 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 186                   GET_CH_LAYOUT_NAME, ",")
 187
 188 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 189 {
 190     FilterGraph *fg = av_mallocz(sizeof(*fg));
 191
 192     if (!fg)
 193         exit_program(1);
 194     fg->index = nb_filtergraphs;
 195
 196     fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
 197                              fg->nb_outputs + 1);
 198     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 199         exit_program(1);
 200     fg->outputs[0]->ost   = ost;
 201     fg->outputs[0]->graph = fg;
 202
 203     ost->filter = fg->outputs[0];
 204
 205     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
 206                             fg->nb_inputs + 1);
 207     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 208         exit_program(1);
 209     fg->inputs[0]->ist   = ist;
 210     fg->inputs[0]->graph = fg;
 211
 212     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 213                               &ist->nb_filters, ist->nb_filters + 1);
 214     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 215
 216     filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
 217                               &nb_filtergraphs, nb_filtergraphs + 1);
 218     filtergraphs[nb_filtergraphs - 1] = fg;
 219
 220     return fg;
 221 }
 222
 223 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 224 {
 225     InputStream *ist = NULL;
 226     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 227     int i;
 228
 229     // TODO: support other filter types
 230     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 231         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 232                "currently.\n");
 233         exit_program(1);
 234     }
 235
 236     if (in->name) {
 237         AVFormatContext *s;
 238         AVStream       *st = NULL;
 239         char *p;
 240         int file_idx = strtol(in->name, &p, 0);
 241
 242         if (file_idx < 0 || file_idx >= nb_input_files) {
 243             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 244                    file_idx, fg->graph_desc);
 245             exit_program(1);
 246         }
 247         s = input_files[file_idx]->ctx;
 248
 249         for (i = 0; i < s->nb_streams; i++) {
 250             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 251             if (stream_type != type &&
 252                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 253                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 254                 continue;
 255             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 256                 st = s->streams[i];
 257                 break;
 258             }
 259         }
 260         if (!st) {
 261             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 262                    "matches no streams.\n", p, fg->graph_desc);
 263             exit_program(1);
 264         }
 265         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 266     } else {
 267         /* find the first unused stream of corresponding type */
 268         for (i = 0; i < nb_input_streams; i++) {
 269             ist = input_streams[i];
 270             if (ist->st->codec->codec_type == type && ist->discard)
 271                 break;
 272         }
 273         if (i == nb_input_streams) {
 274             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 275                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 276                    in->filter_ctx->name);
 277             exit_program(1);
 278         }
 279     }
 280     av_assert0(ist);
 281
 282     ist->discard         = 0;
 283     ist->decoding_needed = 1;
 284     ist->st->discard = AVDISCARD_NONE;
 285
 286     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
 287                             &fg->nb_inputs, fg->nb_inputs + 1);
 288     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 289         exit_program(1);
 290     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 291     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 292
 293     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 294                               &ist->nb_filters, ist->nb_filters + 1);
 295     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 296 }
 297
 298 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 299 {
 300     char *pix_fmts;
 301     OutputStream *ost = ofilter->ost;
 302     AVCodecContext *codec = ost->st->codec;
 303     AVFilterContext *last_filter = out->filter_ctx;
 304     int pad_idx = out->pad_idx;
 305     int ret;
 306     char name[255];
 307     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
 308
 309     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 310     ret = avfilter_graph_create_filter(&ofilter->filter,
 311                                        avfilter_get_by_name("buffersink"),
 312                                        name, NULL, NULL/*buffersink_params*/, fg->graph);
 313     av_freep(&buffersink_params);
 314
 315     if (ret < 0)
 316         return ret;
 317
 318     if (codec->width || codec->height) {
 319         char args[255];
 320         AVFilterContext *filter;
 321
 322         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 323                  codec->width,
 324                  codec->height,
 325                  (unsigned)ost->sws_flags);
 326         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 327                  ost->file_index, ost->index);
 328         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 329                                                 name, args, NULL, fg->graph)) < 0)
 330             return ret;
 331         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 332             return ret;
 333
 334         last_filter = filter;
 335         pad_idx = 0;
 336     }
 337
 338     if ((pix_fmts = choose_pix_fmts(ost))) {
 339         AVFilterContext *filter;
 340         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 341                  ost->file_index, ost->index);
 342         if ((ret = avfilter_graph_create_filter(&filter,
 343                                                 avfilter_get_by_name("format"),
 344                                                 "format", pix_fmts, NULL,
 345                                                 fg->graph)) < 0)
 346             return ret;
 347         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 348             return ret;
 349
 350         last_filter = filter;
 351         pad_idx     = 0;
 352         av_freep(&pix_fmts);
 353     }
 354
 355     if (ost->frame_rate.num && 0) {
 356         AVFilterContext *fps;
 357         char args[255];
 358
 359         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 360                  ost->frame_rate.den);
 361         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 362                  ost->file_index, ost->index);
 363         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 364                                            name, args, NULL, fg->graph);
 365         if (ret < 0)
 366             return ret;
 367
 368         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 369         if (ret < 0)
 370             return ret;
 371         last_filter = fps;
 372         pad_idx = 0;
 373     }
 374
 375     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 376         return ret;
 377
 378     return 0;
 379 }
 380
 381 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 382 {
 383     OutputStream *ost = ofilter->ost;
 384     AVCodecContext *codec  = ost->st->codec;
 385     AVFilterContext *last_filter = out->filter_ctx;
 386     int pad_idx = out->pad_idx;
 387     char *sample_fmts, *sample_rates, *channel_layouts;
 388     char name[255];
 389     int ret;
 390
 391
 392     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 393     ret = avfilter_graph_create_filter(&ofilter->filter,
 394                                        avfilter_get_by_name("abuffersink"),
 395                                        name, NULL, NULL, fg->graph);
 396     if (ret < 0)
 397         return ret;
 398
 399 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 400     AVFilterContext *filt_ctx;                                              \
 401                                                                             \
 402     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 403            "similarly to -af " filter_name "=%s.\n", arg);                  \
 404                                                                             \
 405     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 406                                        avfilter_get_by_name(filter_name),   \
 407                                        filter_name, arg, NULL, fg->graph);  \
 408     if (ret < 0)                                                            \
 409         return ret;                                                         \
 410                                                                             \
 411     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 412     if (ret < 0)                                                            \
 413         return ret;                                                         \
 414                                                                             \
 415     last_filter = filt_ctx;                                                 \
 416     pad_idx = 0;                                                            \
 417 } while (0)
 418     if (ost->audio_channels_mapped) {
 419         int i;
 420         AVBPrint pan_buf;
 421         av_bprint_init(&pan_buf, 256, 8192);
 422         av_bprintf(&pan_buf, "0x%"PRIx64,
 423                    av_get_default_channel_layout(ost->audio_channels_mapped));
 424         for (i = 0; i < ost->audio_channels_mapped; i++)
 425             if (ost->audio_channels_map[i] != -1)
 426                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 427
 428         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 429         av_bprint_finalize(&pan_buf, NULL);
 430     }
 431
 432     if (codec->channels && !codec->channel_layout)
 433         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 434
 435     sample_fmts     = choose_sample_fmts(ost);
 436     sample_rates    = choose_sample_rates(ost);
 437     channel_layouts = choose_channel_layouts(ost);
 438     if (sample_fmts || sample_rates || channel_layouts) {
 439         AVFilterContext *format;
 440         char args[256];
 441         int len = 0;
 442
 443         if (sample_fmts)
 444             len += snprintf(args + len, sizeof(args) - len, "sample_fmts=%s:",
 445                             sample_fmts);
 446         if (sample_rates)
 447             len += snprintf(args + len, sizeof(args) - len, "sample_rates=%s:",
 448                             sample_rates);
 449         if (channel_layouts)
 450             len += snprintf(args + len, sizeof(args) - len, "channel_layouts=%s:",
 451                             channel_layouts);
 452         args[len - 1] = 0;
 453
 454         av_freep(&sample_fmts);
 455         av_freep(&sample_rates);
 456         av_freep(&channel_layouts);
 457
 458         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 459                  ost->file_index, ost->index);
 460         ret = avfilter_graph_create_filter(&format,
 461                                            avfilter_get_by_name("aformat"),
 462                                            name, args, NULL, fg->graph);
 463         if (ret < 0)
 464             return ret;
 465
 466         ret = avfilter_link(last_filter, pad_idx, format, 0);
 467         if (ret < 0)
 468             return ret;
 469
 470         last_filter = format;
 471         pad_idx = 0;
 472     }
 473
 474     if (audio_volume != 256 && 0) {
 475         char args[256];
 476
 477         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 478         AUTO_INSERT_FILTER("-vol", "volume", args);
 479     }
 480
 481     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 482         return ret;
 483
 484     return 0;
 485 }
 486
 487 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 488 {                                                                  \
 489     AVFilterContext *ctx = inout->filter_ctx;                      \
 490     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 491     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 492     AVIOContext *pb;                                               \
 493                                                                    \
 494     if (avio_open_dyn_buf(&pb) < 0)                                \
 495         exit_program(1);                                           \
 496                                                                    \
 497     avio_printf(pb, "%s", ctx->filter->name);                      \
 498     if (nb_pads > 1)                                               \
 499         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 500     avio_w8(pb, 0);                                                \
 501     avio_close_dyn_buf(pb, &f->name);                              \
 502 }
 503
 504 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 505 {
 506     av_freep(&ofilter->name);
 507     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 508
 509     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 510     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 511     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 512     default: av_assert0(0);
 513     }
 514 }
 515
 516 static int sub2video_prepare(InputStream *ist)
 517 {
 518     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 519     int i, ret, w, h;
 520     uint8_t *image[4];
 521     int linesize[4];
 522
 523     /* Compute the size of the canvas for the subtitles stream.
 524        If the subtitles codec has set a size, use it. Otherwise use the
 525        maximum dimensions of the video streams in the same file. */
 526     w = ist->st->codec->width;
 527     h = ist->st->codec->height;
 528     if (!(w && h)) {
 529         for (i = 0; i < avf->nb_streams; i++) {
 530             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 531                 w = FFMAX(w, avf->streams[i]->codec->width);
 532                 h = FFMAX(h, avf->streams[i]->codec->height);
 533             }
 534         }
 535         if (!(w && h)) {
 536             w = FFMAX(w, 720);
 537             h = FFMAX(h, 576);
 538         }
 539         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 540     }
 541     ist->sub2video.w = ist->st->codec->width  = w;
 542     ist->sub2video.h = ist->st->codec->height = h;
 543
 544     /* rectangles are PIX_FMT_PAL8, but we have no guarantee that the
 545        palettes for all rectangles are identical or compatible */
 546     ist->st->codec->pix_fmt = PIX_FMT_RGB32;
 547
 548     ret = av_image_alloc(image, linesize, w, h, PIX_FMT_RGB32, 32);
 549     if (ret < 0)
 550         return ret;
 551     memset(image[0], 0, h * linesize[0]);
 552     ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
 553             image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
 554             w, h, PIX_FMT_RGB32);
 555     if (!ist->sub2video.ref) {
 556         av_free(image[0]);
 557         return AVERROR(ENOMEM);
 558     }
 559     return 0;
 560 }
 561
 562 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 563                                         AVFilterInOut *in)
 564 {
 565     AVFilterContext *first_filter = in->filter_ctx;
 566     AVFilter *filter = avfilter_get_by_name("buffer");
 567     InputStream *ist = ifilter->ist;
 568     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 569                                          ist->st->time_base;
 570     AVRational fr = ist->framerate.num ? ist->framerate :
 571                                          ist->st->r_frame_rate;
 572     AVRational sar;
 573     AVBPrint args;
 574     char name[255];
 575     int pad_idx = in->pad_idx;
 576     int ret;
 577
 578     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 579         ret = sub2video_prepare(ist);
 580         if (ret < 0)
 581             return ret;
 582     }
 583
 584     sar = ist->st->sample_aspect_ratio.num ?
 585           ist->st->sample_aspect_ratio :
 586           ist->st->codec->sample_aspect_ratio;
 587     if(!sar.den)
 588         sar = (AVRational){0,1};
 589     av_bprint_init(&args, 0, 1);
 590     av_bprintf(&args,
 591              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 592              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->st->codec->width,
 593              ist->st->codec->height, ist->st->codec->pix_fmt,
 594              tb.num, tb.den, sar.num, sar.den,
 595              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 596     if (fr.num && fr.den)
 597         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 598     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 599              ist->file_index, ist->st->index);
 600
 601     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 602                                             args.str, NULL, fg->graph)) < 0)
 603         return ret;
 604
 605     if (ist->framerate.num) {
 606         AVFilterContext *setpts;
 607
 608         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 609                  ist->file_index, ist->st->index);
 610         if ((ret = avfilter_graph_create_filter(&setpts,
 611                                                 avfilter_get_by_name("setpts"),
 612                                                 name, "N", NULL,
 613                                                 fg->graph)) < 0)
 614             return ret;
 615
 616         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 617             return ret;
 618
 619         first_filter = setpts;
 620         pad_idx = 0;
 621     }
 622
 623     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 624         return ret;
 625     return 0;
 626 }
 627
 628 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 629                                         AVFilterInOut *in)
 630 {
 631     AVFilterContext *first_filter = in->filter_ctx;
 632     AVFilter *filter = avfilter_get_by_name("abuffer");
 633     InputStream *ist = ifilter->ist;
 634     int pad_idx = in->pad_idx;
 635     char args[255], name[255];
 636     int ret;
 637
 638     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
 639              ":channel_layout=0x%"PRIx64,
 640              1, ist->st->codec->sample_rate,
 641              ist->st->codec->sample_rate,
 642              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
 643              ist->st->codec->channel_layout);
 644     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 645              ist->file_index, ist->st->index);
 646
 647     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 648                                             name, args, NULL,
 649                                             fg->graph)) < 0)
 650         return ret;
 651
 652 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 653     AVFilterContext *filt_ctx;                                              \
 654                                                                             \
 655     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 656            "similarly to -af " filter_name "=%s.\n", arg);                  \
 657                                                                             \
 658     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 659                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 660     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 661                                        avfilter_get_by_name(filter_name),   \
 662                                        name, arg, NULL, fg->graph);         \
 663     if (ret < 0)                                                            \
 664         return ret;                                                         \
 665                                                                             \
 666     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 667     if (ret < 0)                                                            \
 668         return ret;                                                         \
 669                                                                             \
 670     first_filter = filt_ctx;                                                  \
 671 } while (0)
 672
 673     if (audio_sync_method > 0) {
 674         char args[256] = {0};
 675
 676         av_strlcatf(args, sizeof(args), "min_comp=0.001:min_hard_comp=%f", audio_drift_threshold);
 677         if (audio_sync_method > 1)
 678             av_strlcatf(args, sizeof(args), ":max_soft_comp=%f", audio_sync_method/(double)ist->st->codec->sample_rate);
 679         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 680     }
 681
 682 //     if (ost->audio_channels_mapped) {
 683 //         int i;
 684 //         AVBPrint pan_buf;
 685 //         av_bprint_init(&pan_buf, 256, 8192);
 686 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 687 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 688 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 689 //             if (ost->audio_channels_map[i] != -1)
 690 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 691 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 692 //         av_bprint_finalize(&pan_buf, NULL);
 693 //     }
 694
 695     if (audio_volume != 256) {
 696         char args[256];
 697
 698         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 699         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 700     }
 701     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 702         return ret;
 703
 704     return 0;
 705 }
 706
 707 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 708                                   AVFilterInOut *in)
 709 {
 710     av_freep(&ifilter->name);
 711     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 712
 713     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 714     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 715     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 716     default: av_assert0(0);
 717     }
 718 }
 719
 720 int configure_filtergraph(FilterGraph *fg)
 721 {
 722     AVFilterInOut *inputs, *outputs, *cur;
 723     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 724     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 725                                       fg->graph_desc;
 726
 727     avfilter_graph_free(&fg->graph);
 728     if (!(fg->graph = avfilter_graph_alloc()))
 729         return AVERROR(ENOMEM);
 730
 731     if (simple) {
 732         OutputStream *ost = fg->outputs[0]->ost;
 733         char args[255];
 734         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 735         fg->graph->scale_sws_opts = av_strdup(args);
 736     }
 737
 738     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 739         return ret;
 740
 741     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 742         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 743                "exactly one input and output.\n", graph_desc);
 744         return AVERROR(EINVAL);
 745     }
 746
 747     for (cur = inputs; !simple && init && cur; cur = cur->next)
 748         init_input_filter(fg, cur);
 749
 750     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 751         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 752             return ret;
 753     avfilter_inout_free(&inputs);
 754
 755     if (!init || simple) {
 756         /* we already know the mappings between lavfi outputs and output streams,
 757          * so we can finish the setup */
 758         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 759             configure_output_filter(fg, fg->outputs[i], cur);
 760         avfilter_inout_free(&outputs);
 761
 762         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 763             return ret;
 764     } else {
 765         /* wait until output mappings are processed */
 766         for (cur = outputs; cur;) {
 767             fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
 768                                      &fg->nb_outputs, fg->nb_outputs + 1);
 769             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 770                 exit_program(1);
 771             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 772             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 773             cur = cur->next;
 774             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 775         }
 776     }
 777
 778     return 0;
 779 }
 780
 781 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 782 {
 783     int i;
 784     for (i = 0; i < fg->nb_inputs; i++)
 785         if (fg->inputs[i]->ist == ist)
 786             return 1;
 787     return 0;
 788 }
 789