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