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 "libavresample/avresample.h"
  28
  29 #include "libavutil/avassert.h"
  30 #include "libavutil/avstring.h"
  31 #include "libavutil/bprint.h"
  32 #include "libavutil/channel_layout.h"
  33 #include "libavutil/opt.h"
  34 #include "libavutil/pixdesc.h"
  35 #include "libavutil/pixfmt.h"
  36 #include "libavutil/imgutils.h"
  37 #include "libavutil/samplefmt.h"
  38
  39 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  40 {
  41     if (codec && codec->pix_fmts) {
  42         const enum AVPixelFormat *p = codec->pix_fmts;
  43         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  44         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  45         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  46         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  47             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  48                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  49             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  50                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  51                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  52             }
  53         }
  54         for (; *p != AV_PIX_FMT_NONE; p++) {
  55             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  56             if (*p == target)
  57                 break;
  58         }
  59         if (*p == AV_PIX_FMT_NONE) {
  60             if (target != AV_PIX_FMT_NONE)
  61                 av_log(NULL, AV_LOG_WARNING,
  62                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  63                        av_get_pix_fmt_name(target),
  64                        codec->name,
  65                        av_get_pix_fmt_name(best));
  66             return best;
  67         }
  68     }
  69     return target;
  70 }
  71
  72 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  73 {
  74     if (codec && codec->sample_fmts) {
  75         const enum AVSampleFormat *p = codec->sample_fmts;
  76         for (; *p != -1; p++) {
  77             if (*p == st->codec->sample_fmt)
  78                 break;
  79         }
  80         if (*p == -1) {
  81             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  82                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  83             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  84             av_log(NULL, AV_LOG_WARNING,
  85                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  86                    av_get_sample_fmt_name(st->codec->sample_fmt),
  87                    codec->name,
  88                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  89             st->codec->sample_fmt = codec->sample_fmts[0];
  90         }
  91     }
  92 }
  93
  94 static char *choose_pix_fmts(OutputStream *ost)
  95 {
  96      if (ost->keep_pix_fmt) {
  97         if (ost->filter)
  98             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  99                                             AVFILTER_AUTO_CONVERT_NONE);
 100         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
 101             return NULL;
 102         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 103     }
 104     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 105         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 106     } else if (ost->enc && ost->enc->pix_fmts) {
 107         const enum AVPixelFormat *p;
 108         AVIOContext *s = NULL;
 109         uint8_t *ret;
 110         int len;
 111
 112         if (avio_open_dyn_buf(&s) < 0)
 113             exit(1);
 114
 115         p = ost->enc->pix_fmts;
 116         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 117             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 118                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 119             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 120                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 121                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 122             }
 123         }
 124
 125         for (; *p != AV_PIX_FMT_NONE; p++) {
 126             const char *name = av_get_pix_fmt_name(*p);
 127             avio_printf(s, "%s:", name);
 128         }
 129         len = avio_close_dyn_buf(s, &ret);
 130         ret[len - 1] = 0;
 131         return ret;
 132     } else
 133         return NULL;
 134 }
 135
 136 /* Define a function for building a string containing a list of
 137  * allowed formats. */
 138 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
 139 static char *choose_ ## var ## s(OutputStream *ost)                            \
 140 {                                                                              \
 141     if (ost->st->codec->var != none) {                                         \
 142         get_name(ost->st->codec->var);                                         \
 143         return av_strdup(name);                                                \
 144     } else if (ost->enc && ost->enc->supported_list) {                         \
 145         const type *p;                                                         \
 146         AVIOContext *s = NULL;                                                 \
 147         uint8_t *ret;                                                          \
 148         int len;                                                               \
 149                                                                                \
 150         if (avio_open_dyn_buf(&s) < 0)                                         \
 151             exit(1);                                                           \
 152                                                                                \
 153         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 154             get_name(*p);                                                      \
 155             avio_printf(s, "%s" separator, name);                              \
 156         }                                                                      \
 157         len = avio_close_dyn_buf(s, &ret);                                     \
 158         ret[len - 1] = 0;                                                      \
 159         return ret;                                                            \
 160     } else                                                                     \
 161         return NULL;                                                           \
 162 }
 163
 164 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 165 //                   GET_PIX_FMT_NAME, ":")
 166
 167 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 168                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
 169
 170 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 171                   GET_SAMPLE_RATE_NAME, ",")
 172
 173 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 174                   GET_CH_LAYOUT_NAME, ",")
 175
 176 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 177 {
 178     FilterGraph *fg = av_mallocz(sizeof(*fg));
 179
 180     if (!fg)
 181         exit(1);
 182     fg->index = nb_filtergraphs;
 183
 184     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 185     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 186         exit(1);
 187     fg->outputs[0]->ost   = ost;
 188     fg->outputs[0]->graph = fg;
 189
 190     ost->filter = fg->outputs[0];
 191
 192     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 193     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 194         exit(1);
 195     fg->inputs[0]->ist   = ist;
 196     fg->inputs[0]->graph = fg;
 197
 198     GROW_ARRAY(ist->filters, ist->nb_filters);
 199     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 200
 201     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 202     filtergraphs[nb_filtergraphs - 1] = fg;
 203
 204     return fg;
 205 }
 206
 207 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 208 {
 209     InputStream *ist = NULL;
 210     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 211     int i;
 212
 213     // TODO: support other filter types
 214     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 215         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 216                "currently.\n");
 217         exit(1);
 218     }
 219
 220     if (in->name) {
 221         AVFormatContext *s;
 222         AVStream       *st = NULL;
 223         char *p;
 224         int file_idx = strtol(in->name, &p, 0);
 225
 226         if (file_idx < 0 || file_idx >= nb_input_files) {
 227             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 228                    file_idx, fg->graph_desc);
 229             exit(1);
 230         }
 231         s = input_files[file_idx]->ctx;
 232
 233         for (i = 0; i < s->nb_streams; i++) {
 234             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 235             if (stream_type != type &&
 236                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 237                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 238                 continue;
 239             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 240                 st = s->streams[i];
 241                 break;
 242             }
 243         }
 244         if (!st) {
 245             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 246                    "matches no streams.\n", p, fg->graph_desc);
 247             exit(1);
 248         }
 249         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 250     } else {
 251         /* find the first unused stream of corresponding type */
 252         for (i = 0; i < nb_input_streams; i++) {
 253             ist = input_streams[i];
 254             if (ist->st->codec->codec_type == type && ist->discard)
 255                 break;
 256         }
 257         if (i == nb_input_streams) {
 258             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 259                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 260                    in->filter_ctx->name);
 261             exit(1);
 262         }
 263     }
 264     av_assert0(ist);
 265
 266     ist->discard         = 0;
 267     ist->decoding_needed++;
 268     ist->st->discard = AVDISCARD_NONE;
 269
 270     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 271     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 272         exit(1);
 273     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 274     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 275
 276     GROW_ARRAY(ist->filters, ist->nb_filters);
 277     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 278 }
 279
 280 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 281 {
 282     char *pix_fmts;
 283     OutputStream *ost = ofilter->ost;
 284     AVCodecContext *codec = ost->st->codec;
 285     AVFilterContext *last_filter = out->filter_ctx;
 286     int pad_idx = out->pad_idx;
 287     int ret;
 288     char name[255];
 289     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
 290
 291     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 292     ret = avfilter_graph_create_filter(&ofilter->filter,
 293                                        avfilter_get_by_name("ffbuffersink"),
 294                                        name, NULL, NULL, fg->graph);
 295     av_freep(&buffersink_params);
 296
 297     if (ret < 0)
 298         return ret;
 299
 300     if (codec->width || codec->height) {
 301         char args[255];
 302         AVFilterContext *filter;
 303
 304         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 305                  codec->width,
 306                  codec->height,
 307                  (unsigned)ost->sws_flags);
 308         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 309                  ost->file_index, ost->index);
 310         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 311                                                 name, args, NULL, fg->graph)) < 0)
 312             return ret;
 313         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 314             return ret;
 315
 316         last_filter = filter;
 317         pad_idx = 0;
 318     }
 319
 320     if ((pix_fmts = choose_pix_fmts(ost))) {
 321         AVFilterContext *filter;
 322         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 323                  ost->file_index, ost->index);
 324         if ((ret = avfilter_graph_create_filter(&filter,
 325                                                 avfilter_get_by_name("format"),
 326                                                 "format", pix_fmts, NULL,
 327                                                 fg->graph)) < 0)
 328             return ret;
 329         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 330             return ret;
 331
 332         last_filter = filter;
 333         pad_idx     = 0;
 334         av_freep(&pix_fmts);
 335     }
 336
 337     if (ost->frame_rate.num && 0) {
 338         AVFilterContext *fps;
 339         char args[255];
 340
 341         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 342                  ost->frame_rate.den);
 343         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 344                  ost->file_index, ost->index);
 345         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 346                                            name, args, NULL, fg->graph);
 347         if (ret < 0)
 348             return ret;
 349
 350         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 351         if (ret < 0)
 352             return ret;
 353         last_filter = fps;
 354         pad_idx = 0;
 355     }
 356
 357     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 358         return ret;
 359
 360     return 0;
 361 }
 362
 363 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 364 {
 365     OutputStream *ost = ofilter->ost;
 366     AVCodecContext *codec  = ost->st->codec;
 367     AVFilterContext *last_filter = out->filter_ctx;
 368     int pad_idx = out->pad_idx;
 369     char *sample_fmts, *sample_rates, *channel_layouts;
 370     char name[255];
 371     int ret;
 372     AVABufferSinkParams *params = av_abuffersink_params_alloc();
 373
 374     if (!params)
 375         return AVERROR(ENOMEM);
 376     params->all_channel_counts = 1;
 377     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 378     ret = avfilter_graph_create_filter(&ofilter->filter,
 379                                        avfilter_get_by_name("ffabuffersink"),
 380                                        name, NULL, params, fg->graph);
 381     av_freep(&params);
 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         args[0] = 0;
 428
 429         if (sample_fmts)
 430             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 431                             sample_fmts);
 432         if (sample_rates)
 433             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 434                             sample_rates);
 435         if (channel_layouts)
 436             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 437                             channel_layouts);
 438
 439         av_freep(&sample_fmts);
 440         av_freep(&sample_rates);
 441         av_freep(&channel_layouts);
 442
 443         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 444                  ost->file_index, ost->index);
 445         ret = avfilter_graph_create_filter(&format,
 446                                            avfilter_get_by_name("aformat"),
 447                                            name, args, NULL, fg->graph);
 448         if (ret < 0)
 449             return ret;
 450
 451         ret = avfilter_link(last_filter, pad_idx, format, 0);
 452         if (ret < 0)
 453             return ret;
 454
 455         last_filter = format;
 456         pad_idx = 0;
 457     }
 458
 459     if (audio_volume != 256 && 0) {
 460         char args[256];
 461
 462         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 463         AUTO_INSERT_FILTER("-vol", "volume", args);
 464     }
 465
 466     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 467         return ret;
 468
 469     return 0;
 470 }
 471
 472 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 473 {                                                                  \
 474     AVFilterContext *ctx = inout->filter_ctx;                      \
 475     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 476     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 477     AVIOContext *pb;                                               \
 478                                                                    \
 479     if (avio_open_dyn_buf(&pb) < 0)                                \
 480         exit(1);                                                   \
 481                                                                    \
 482     avio_printf(pb, "%s", ctx->filter->name);                      \
 483     if (nb_pads > 1)                                               \
 484         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 485     avio_w8(pb, 0);                                                \
 486     avio_close_dyn_buf(pb, &f->name);                              \
 487 }
 488
 489 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 490 {
 491     av_freep(&ofilter->name);
 492     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 493
 494     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 495     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 496     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 497     default: av_assert0(0);
 498     }
 499 }
 500
 501 static int sub2video_prepare(InputStream *ist)
 502 {
 503     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 504     int i, w, h;
 505
 506     /* Compute the size of the canvas for the subtitles stream.
 507        If the subtitles codec has set a size, use it. Otherwise use the
 508        maximum dimensions of the video streams in the same file. */
 509     w = ist->st->codec->width;
 510     h = ist->st->codec->height;
 511     if (!(w && h)) {
 512         for (i = 0; i < avf->nb_streams; i++) {
 513             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 514                 w = FFMAX(w, avf->streams[i]->codec->width);
 515                 h = FFMAX(h, avf->streams[i]->codec->height);
 516             }
 517         }
 518         if (!(w && h)) {
 519             w = FFMAX(w, 720);
 520             h = FFMAX(h, 576);
 521         }
 522         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 523     }
 524     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
 525     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
 526
 527     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 528        palettes for all rectangles are identical or compatible */
 529     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 530
 531     ist->sub2video.frame = av_frame_alloc();
 532     if (!ist->sub2video.frame)
 533         return AVERROR(ENOMEM);
 534     return 0;
 535 }
 536
 537 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 538                                         AVFilterInOut *in)
 539 {
 540     AVFilterContext *first_filter = in->filter_ctx;
 541     AVFilter *filter = avfilter_get_by_name("buffer");
 542     InputStream *ist = ifilter->ist;
 543     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 544                                          ist->st->time_base;
 545     AVRational fr = ist->framerate.num ? ist->framerate :
 546                                          ist->st->r_frame_rate;
 547     AVRational sar;
 548     AVBPrint args;
 549     char name[255];
 550     int pad_idx = in->pad_idx;
 551     int ret;
 552
 553     if (!ist->framerate.num && ist->st->codec->ticks_per_frame>1) {
 554         AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
 555         AVRational   avg_fr = ist->st->avg_frame_rate;
 556         codec_fr.den *= ist->st->codec->ticks_per_frame;
 557         if (   codec_fr.num>0 && codec_fr.den>0 && av_q2d(codec_fr) < av_q2d(fr)*0.7
 558             && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr)))>0.1)
 559             fr = codec_fr;
 560     }
 561
 562     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 563         ret = sub2video_prepare(ist);
 564         if (ret < 0)
 565             return ret;
 566     }
 567
 568     sar = ist->st->sample_aspect_ratio.num ?
 569           ist->st->sample_aspect_ratio :
 570           ist->st->codec->sample_aspect_ratio;
 571     if(!sar.den)
 572         sar = (AVRational){0,1};
 573     av_bprint_init(&args, 0, 1);
 574     av_bprintf(&args,
 575              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 576              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 577              ist->resample_height, ist->resample_pix_fmt,
 578              tb.num, tb.den, sar.num, sar.den,
 579              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 580     if (fr.num && fr.den)
 581         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 582     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 583              ist->file_index, ist->st->index);
 584
 585     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 586                                             args.str, NULL, fg->graph)) < 0)
 587         return ret;
 588
 589     if (ist->framerate.num) {
 590         AVFilterContext *setpts;
 591
 592         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 593                  ist->file_index, ist->st->index);
 594         if ((ret = avfilter_graph_create_filter(&setpts,
 595                                                 avfilter_get_by_name("setpts"),
 596                                                 name, "N", NULL,
 597                                                 fg->graph)) < 0)
 598             return ret;
 599
 600         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 601             return ret;
 602
 603         first_filter = setpts;
 604         pad_idx = 0;
 605     }
 606
 607     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 608         return ret;
 609     return 0;
 610 }
 611
 612 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 613                                         AVFilterInOut *in)
 614 {
 615     AVFilterContext *first_filter = in->filter_ctx;
 616     AVFilter *filter = avfilter_get_by_name("abuffer");
 617     InputStream *ist = ifilter->ist;
 618     int pad_idx = in->pad_idx;
 619     AVBPrint args;
 620     char name[255];
 621     int ret;
 622
 623     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 624     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 625              1, ist->st->codec->sample_rate,
 626              ist->st->codec->sample_rate,
 627              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 628     if (ist->st->codec->channel_layout)
 629         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 630                    ist->st->codec->channel_layout);
 631     else
 632         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 633     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 634              ist->file_index, ist->st->index);
 635
 636     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 637                                             name, args.str, NULL,
 638                                             fg->graph)) < 0)
 639         return ret;
 640
 641 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 642     AVFilterContext *filt_ctx;                                              \
 643                                                                             \
 644     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 645            "similarly to -af " filter_name "=%s.\n", arg);                  \
 646                                                                             \
 647     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 648                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 649     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 650                                        avfilter_get_by_name(filter_name),   \
 651                                        name, arg, NULL, fg->graph);         \
 652     if (ret < 0)                                                            \
 653         return ret;                                                         \
 654                                                                             \
 655     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 656     if (ret < 0)                                                            \
 657         return ret;                                                         \
 658                                                                             \
 659     first_filter = filt_ctx;                                                  \
 660 } while (0)
 661
 662     if (audio_sync_method > 0) {
 663         char args[256] = {0};
 664
 665         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 666         if (audio_drift_threshold != 0.1)
 667             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 668         if (!fg->reconfiguration)
 669             av_strlcatf(args, sizeof(args), ":first_pts=0");
 670         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 671     }
 672
 673 //     if (ost->audio_channels_mapped) {
 674 //         int i;
 675 //         AVBPrint pan_buf;
 676 //         av_bprint_init(&pan_buf, 256, 8192);
 677 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 678 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 679 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 680 //             if (ost->audio_channels_map[i] != -1)
 681 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 682 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 683 //         av_bprint_finalize(&pan_buf, NULL);
 684 //     }
 685
 686     if (audio_volume != 256) {
 687         char args[256];
 688
 689         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 690                "audio filter instead.\n");
 691
 692         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 693         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 694     }
 695     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 696         return ret;
 697
 698     return 0;
 699 }
 700
 701 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 702                                   AVFilterInOut *in)
 703 {
 704     av_freep(&ifilter->name);
 705     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 706
 707     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 708     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 709     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 710     default: av_assert0(0);
 711     }
 712 }
 713
 714 int configure_filtergraph(FilterGraph *fg)
 715 {
 716     AVFilterInOut *inputs, *outputs, *cur;
 717     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 718     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 719                                       fg->graph_desc;
 720
 721     avfilter_graph_free(&fg->graph);
 722     if (!(fg->graph = avfilter_graph_alloc()))
 723         return AVERROR(ENOMEM);
 724
 725     if (simple) {
 726         OutputStream *ost = fg->outputs[0]->ost;
 727         char args[512];
 728         AVDictionaryEntry *e = NULL;
 729
 730         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 731         fg->graph->scale_sws_opts = av_strdup(args);
 732
 733         args[0] = 0;
 734         while ((e = av_dict_get(ost->swr_opts, "", e,
 735                                 AV_DICT_IGNORE_SUFFIX))) {
 736             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 737         }
 738         if (strlen(args))
 739             args[strlen(args)-1] = 0;
 740         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 741
 742         args[0] = '\0';
 743         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 744                                 AV_DICT_IGNORE_SUFFIX))) {
 745             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 746         }
 747         if (strlen(args))
 748             args[strlen(args) - 1] = '\0';
 749         fg->graph->resample_lavr_opts = av_strdup(args);
 750     }
 751
 752     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 753         return ret;
 754
 755     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 756         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 757                "exactly one input and output.\n", graph_desc);
 758         return AVERROR(EINVAL);
 759     }
 760
 761     for (cur = inputs; !simple && init && cur; cur = cur->next)
 762         init_input_filter(fg, cur);
 763
 764     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 765         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 766             return ret;
 767     avfilter_inout_free(&inputs);
 768
 769     if (!init || simple) {
 770         /* we already know the mappings between lavfi outputs and output streams,
 771          * so we can finish the setup */
 772         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 773             configure_output_filter(fg, fg->outputs[i], cur);
 774         avfilter_inout_free(&outputs);
 775
 776         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 777             return ret;
 778     } else {
 779         /* wait until output mappings are processed */
 780         for (cur = outputs; cur;) {
 781             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 782             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 783                 exit(1);
 784             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 785             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 786             cur = cur->next;
 787             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 788         }
 789     }
 790
 791     fg->reconfiguration = 1;
 792     return 0;
 793 }
 794
 795 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 796 {
 797     int i;
 798     for (i = 0; i < fg->nb_inputs; i++)
 799         if (fg->inputs[i]->ist == ist)
 800             return 1;
 801     return 0;
 802 }
 803