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/avassert.h"
  28 #include "libavutil/avstring.h"
  29 #include "libavutil/bprint.h"
  30 #include "libavutil/channel_layout.h"
  31 #include "libavutil/opt.h"
  32 #include "libavutil/pixdesc.h"
  33 #include "libavutil/pixfmt.h"
  34 #include "libavutil/imgutils.h"
  35 #include "libavutil/samplefmt.h"
  36
  37 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  38 {
  39     if (codec && codec->pix_fmts) {
  40         const enum AVPixelFormat *p = codec->pix_fmts;
  41         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  42         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  43         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  44         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  45             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  46                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  47             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  48                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  49                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  50             }
  51         }
  52         for (; *p != AV_PIX_FMT_NONE; p++) {
  53             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  54             if (*p == target)
  55                 break;
  56         }
  57         if (*p == AV_PIX_FMT_NONE) {
  58             if (target != AV_PIX_FMT_NONE)
  59                 av_log(NULL, AV_LOG_WARNING,
  60                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  61                        av_get_pix_fmt_name(target),
  62                        codec->name,
  63                        av_get_pix_fmt_name(best));
  64             return best;
  65         }
  66     }
  67     return target;
  68 }
  69
  70 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  71 {
  72     if (codec && codec->sample_fmts) {
  73         const enum AVSampleFormat *p = codec->sample_fmts;
  74         for (; *p != -1; p++) {
  75             if (*p == st->codec->sample_fmt)
  76                 break;
  77         }
  78         if (*p == -1) {
  79             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  80                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  81             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  82             av_log(NULL, AV_LOG_WARNING,
  83                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  84                    av_get_sample_fmt_name(st->codec->sample_fmt),
  85                    codec->name,
  86                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  87             st->codec->sample_fmt = codec->sample_fmts[0];
  88         }
  89     }
  90 }
  91
  92 static char *choose_pix_fmts(OutputStream *ost)
  93 {
  94      if (ost->keep_pix_fmt) {
  95         if (ost->filter)
  96             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  97                                             AVFILTER_AUTO_CONVERT_NONE);
  98         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
  99             return NULL;
 100         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 101     }
 102     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 103         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 104     } else if (ost->enc && ost->enc->pix_fmts) {
 105         const enum AVPixelFormat *p;
 106         AVIOContext *s = NULL;
 107         uint8_t *ret;
 108         int len;
 109
 110         if (avio_open_dyn_buf(&s) < 0)
 111             exit(1);
 112
 113         p = ost->enc->pix_fmts;
 114         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 115             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 116                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 117             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 118                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 119                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 120             }
 121         }
 122
 123         for (; *p != AV_PIX_FMT_NONE; p++) {
 124             const char *name = av_get_pix_fmt_name(*p);
 125             avio_printf(s, "%s:", name);
 126         }
 127         len = avio_close_dyn_buf(s, &ret);
 128         ret[len - 1] = 0;
 129         return ret;
 130     } else
 131         return NULL;
 132 }
 133
 134 /* Define a function for building a string containing a list of
 135  * allowed formats. */
 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(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 AVPixelFormat, pix_fmt, pix_fmts, AV_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(1);
 180     fg->index = nb_filtergraphs;
 181
 182     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 183     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 184         exit(1);
 185     fg->outputs[0]->ost   = ost;
 186     fg->outputs[0]->graph = fg;
 187
 188     ost->filter = fg->outputs[0];
 189
 190     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 191     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 192         exit(1);
 193     fg->inputs[0]->ist   = ist;
 194     fg->inputs[0]->graph = fg;
 195
 196     GROW_ARRAY(ist->filters, ist->nb_filters);
 197     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 198
 199     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 200     filtergraphs[nb_filtergraphs - 1] = fg;
 201
 202     return fg;
 203 }
 204
 205 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 206 {
 207     InputStream *ist = NULL;
 208     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 209     int i;
 210
 211     // TODO: support other filter types
 212     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 213         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 214                "currently.\n");
 215         exit(1);
 216     }
 217
 218     if (in->name) {
 219         AVFormatContext *s;
 220         AVStream       *st = NULL;
 221         char *p;
 222         int file_idx = strtol(in->name, &p, 0);
 223
 224         if (file_idx < 0 || file_idx >= nb_input_files) {
 225             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 226                    file_idx, fg->graph_desc);
 227             exit(1);
 228         }
 229         s = input_files[file_idx]->ctx;
 230
 231         for (i = 0; i < s->nb_streams; i++) {
 232             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 233             if (stream_type != type &&
 234                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 235                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 236                 continue;
 237             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 238                 st = s->streams[i];
 239                 break;
 240             }
 241         }
 242         if (!st) {
 243             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 244                    "matches no streams.\n", p, fg->graph_desc);
 245             exit(1);
 246         }
 247         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 248     } else {
 249         /* find the first unused stream of corresponding type */
 250         for (i = 0; i < nb_input_streams; i++) {
 251             ist = input_streams[i];
 252             if (ist->st->codec->codec_type == type && ist->discard)
 253                 break;
 254         }
 255         if (i == nb_input_streams) {
 256             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 257                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 258                    in->filter_ctx->name);
 259             exit(1);
 260         }
 261     }
 262     av_assert0(ist);
 263
 264     ist->discard         = 0;
 265     ist->decoding_needed++;
 266     ist->st->discard = AVDISCARD_NONE;
 267
 268     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 269     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 270         exit(1);
 271     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 272     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 273
 274     GROW_ARRAY(ist->filters, ist->nb_filters);
 275     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 276 }
 277
 278 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 279 {
 280     char *pix_fmts;
 281     OutputStream *ost = ofilter->ost;
 282     AVCodecContext *codec = ost->st->codec;
 283     AVFilterContext *last_filter = out->filter_ctx;
 284     int pad_idx = out->pad_idx;
 285     int ret;
 286     char name[255];
 287     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
 288
 289     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 290     ret = avfilter_graph_create_filter(&ofilter->filter,
 291                                        avfilter_get_by_name("ffbuffersink"),
 292                                        name, NULL, NULL, fg->graph);
 293     av_freep(&buffersink_params);
 294
 295     if (ret < 0)
 296         return ret;
 297
 298     if (codec->width || codec->height) {
 299         char args[255];
 300         AVFilterContext *filter;
 301
 302         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 303                  codec->width,
 304                  codec->height,
 305                  (unsigned)ost->sws_flags);
 306         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 307                  ost->file_index, ost->index);
 308         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 309                                                 name, args, NULL, fg->graph)) < 0)
 310             return ret;
 311         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 312             return ret;
 313
 314         last_filter = filter;
 315         pad_idx = 0;
 316     }
 317
 318     if ((pix_fmts = choose_pix_fmts(ost))) {
 319         AVFilterContext *filter;
 320         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 321                  ost->file_index, ost->index);
 322         if ((ret = avfilter_graph_create_filter(&filter,
 323                                                 avfilter_get_by_name("format"),
 324                                                 "format", pix_fmts, NULL,
 325                                                 fg->graph)) < 0)
 326             return ret;
 327         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 328             return ret;
 329
 330         last_filter = filter;
 331         pad_idx     = 0;
 332         av_freep(&pix_fmts);
 333     }
 334
 335     if (ost->frame_rate.num && 0) {
 336         AVFilterContext *fps;
 337         char args[255];
 338
 339         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 340                  ost->frame_rate.den);
 341         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 342                  ost->file_index, ost->index);
 343         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 344                                            name, args, NULL, fg->graph);
 345         if (ret < 0)
 346             return ret;
 347
 348         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 349         if (ret < 0)
 350             return ret;
 351         last_filter = fps;
 352         pad_idx = 0;
 353     }
 354
 355     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 356         return ret;
 357
 358     return 0;
 359 }
 360
 361 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 362 {
 363     OutputStream *ost = ofilter->ost;
 364     AVCodecContext *codec  = ost->st->codec;
 365     AVFilterContext *last_filter = out->filter_ctx;
 366     int pad_idx = out->pad_idx;
 367     char *sample_fmts, *sample_rates, *channel_layouts;
 368     char name[255];
 369     int ret;
 370     AVABufferSinkParams *params = av_abuffersink_params_alloc();
 371
 372     if (!params)
 373         return AVERROR(ENOMEM);
 374     params->all_channel_counts = 1;
 375     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 376     ret = avfilter_graph_create_filter(&ofilter->filter,
 377                                        avfilter_get_by_name("ffabuffersink"),
 378                                        name, NULL, params, fg->graph);
 379     av_freep(&params);
 380     if (ret < 0)
 381         return ret;
 382
 383 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 384     AVFilterContext *filt_ctx;                                              \
 385                                                                             \
 386     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 387            "similarly to -af " filter_name "=%s.\n", arg);                  \
 388                                                                             \
 389     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 390                                        avfilter_get_by_name(filter_name),   \
 391                                        filter_name, arg, NULL, fg->graph);  \
 392     if (ret < 0)                                                            \
 393         return ret;                                                         \
 394                                                                             \
 395     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 396     if (ret < 0)                                                            \
 397         return ret;                                                         \
 398                                                                             \
 399     last_filter = filt_ctx;                                                 \
 400     pad_idx = 0;                                                            \
 401 } while (0)
 402     if (ost->audio_channels_mapped) {
 403         int i;
 404         AVBPrint pan_buf;
 405         av_bprint_init(&pan_buf, 256, 8192);
 406         av_bprintf(&pan_buf, "0x%"PRIx64,
 407                    av_get_default_channel_layout(ost->audio_channels_mapped));
 408         for (i = 0; i < ost->audio_channels_mapped; i++)
 409             if (ost->audio_channels_map[i] != -1)
 410                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 411
 412         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 413         av_bprint_finalize(&pan_buf, NULL);
 414     }
 415
 416     if (codec->channels && !codec->channel_layout)
 417         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 418
 419     sample_fmts     = choose_sample_fmts(ost);
 420     sample_rates    = choose_sample_rates(ost);
 421     channel_layouts = choose_channel_layouts(ost);
 422     if (sample_fmts || sample_rates || channel_layouts) {
 423         AVFilterContext *format;
 424         char args[256];
 425         args[0] = 0;
 426
 427         if (sample_fmts)
 428             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 429                             sample_fmts);
 430         if (sample_rates)
 431             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 432                             sample_rates);
 433         if (channel_layouts)
 434             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 435                             channel_layouts);
 436
 437         av_freep(&sample_fmts);
 438         av_freep(&sample_rates);
 439         av_freep(&channel_layouts);
 440
 441         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 442                  ost->file_index, ost->index);
 443         ret = avfilter_graph_create_filter(&format,
 444                                            avfilter_get_by_name("aformat"),
 445                                            name, args, NULL, fg->graph);
 446         if (ret < 0)
 447             return ret;
 448
 449         ret = avfilter_link(last_filter, pad_idx, format, 0);
 450         if (ret < 0)
 451             return ret;
 452
 453         last_filter = format;
 454         pad_idx = 0;
 455     }
 456
 457     if (audio_volume != 256 && 0) {
 458         char args[256];
 459
 460         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 461         AUTO_INSERT_FILTER("-vol", "volume", args);
 462     }
 463
 464     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 465         return ret;
 466
 467     return 0;
 468 }
 469
 470 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 471 {                                                                  \
 472     AVFilterContext *ctx = inout->filter_ctx;                      \
 473     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 474     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 475     AVIOContext *pb;                                               \
 476                                                                    \
 477     if (avio_open_dyn_buf(&pb) < 0)                                \
 478         exit(1);                                                   \
 479                                                                    \
 480     avio_printf(pb, "%s", ctx->filter->name);                      \
 481     if (nb_pads > 1)                                               \
 482         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 483     avio_w8(pb, 0);                                                \
 484     avio_close_dyn_buf(pb, &f->name);                              \
 485 }
 486
 487 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 488 {
 489     av_freep(&ofilter->name);
 490     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 491
 492     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 493     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 494     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 495     default: av_assert0(0);
 496     }
 497 }
 498
 499 static int sub2video_prepare(InputStream *ist)
 500 {
 501     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 502     int i, ret, w, h;
 503     uint8_t *image[4];
 504     int linesize[4];
 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->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 530
 531     ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
 532     if (ret < 0)
 533         return ret;
 534     memset(image[0], 0, h * linesize[0]);
 535     ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
 536             image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
 537             w, h, AV_PIX_FMT_RGB32);
 538     if (!ist->sub2video.ref) {
 539         av_free(image[0]);
 540         return AVERROR(ENOMEM);
 541     }
 542     return 0;
 543 }
 544
 545 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 546                                         AVFilterInOut *in)
 547 {
 548     AVFilterContext *first_filter = in->filter_ctx;
 549     AVFilter *filter = avfilter_get_by_name("buffer");
 550     InputStream *ist = ifilter->ist;
 551     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 552                                          ist->st->time_base;
 553     AVRational fr = ist->framerate.num ? ist->framerate :
 554                                          ist->st->r_frame_rate;
 555     AVRational sar;
 556     AVBPrint args;
 557     char name[255];
 558     int pad_idx = in->pad_idx;
 559     int ret;
 560
 561     if (!ist->framerate.num && ist->st->codec->ticks_per_frame>1) {
 562         AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
 563         AVRational   avg_fr = ist->st->avg_frame_rate;
 564         codec_fr.den *= ist->st->codec->ticks_per_frame;
 565         if (   codec_fr.num>0 && codec_fr.den>0 && av_q2d(codec_fr) < av_q2d(fr)*0.7
 566             && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr)))>0.1)
 567             fr = codec_fr;
 568     }
 569
 570     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 571         ret = sub2video_prepare(ist);
 572         if (ret < 0)
 573             return ret;
 574     }
 575
 576     sar = ist->st->sample_aspect_ratio.num ?
 577           ist->st->sample_aspect_ratio :
 578           ist->st->codec->sample_aspect_ratio;
 579     if(!sar.den)
 580         sar = (AVRational){0,1};
 581     av_bprint_init(&args, 0, 1);
 582     av_bprintf(&args,
 583              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 584              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 585              ist->resample_height, ist->resample_pix_fmt,
 586              tb.num, tb.den, sar.num, sar.den,
 587              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 588     if (fr.num && fr.den)
 589         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 590     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 591              ist->file_index, ist->st->index);
 592
 593     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 594                                             args.str, NULL, fg->graph)) < 0)
 595         return ret;
 596
 597     if (ist->framerate.num) {
 598         AVFilterContext *setpts;
 599
 600         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 601                  ist->file_index, ist->st->index);
 602         if ((ret = avfilter_graph_create_filter(&setpts,
 603                                                 avfilter_get_by_name("setpts"),
 604                                                 name, "N", NULL,
 605                                                 fg->graph)) < 0)
 606             return ret;
 607
 608         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 609             return ret;
 610
 611         first_filter = setpts;
 612         pad_idx = 0;
 613     }
 614
 615     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 616         return ret;
 617     return 0;
 618 }
 619
 620 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 621                                         AVFilterInOut *in)
 622 {
 623     AVFilterContext *first_filter = in->filter_ctx;
 624     AVFilter *filter = avfilter_get_by_name("abuffer");
 625     InputStream *ist = ifilter->ist;
 626     int pad_idx = in->pad_idx;
 627     AVBPrint args;
 628     char name[255];
 629     int ret;
 630
 631     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 632     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 633              1, ist->st->codec->sample_rate,
 634              ist->st->codec->sample_rate,
 635              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 636     if (ist->st->codec->channel_layout)
 637         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 638                    ist->st->codec->channel_layout);
 639     else
 640         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 641     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 642              ist->file_index, ist->st->index);
 643
 644     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 645                                             name, args.str, NULL,
 646                                             fg->graph)) < 0)
 647         return ret;
 648
 649 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 650     AVFilterContext *filt_ctx;                                              \
 651                                                                             \
 652     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 653            "similarly to -af " filter_name "=%s.\n", arg);                  \
 654                                                                             \
 655     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 656                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 657     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 658                                        avfilter_get_by_name(filter_name),   \
 659                                        name, arg, NULL, fg->graph);         \
 660     if (ret < 0)                                                            \
 661         return ret;                                                         \
 662                                                                             \
 663     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 664     if (ret < 0)                                                            \
 665         return ret;                                                         \
 666                                                                             \
 667     first_filter = filt_ctx;                                                  \
 668 } while (0)
 669
 670     if (audio_sync_method > 0) {
 671         char args[256] = {0};
 672
 673         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 674         if (audio_drift_threshold != 0.1)
 675             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 676         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 677     }
 678
 679 //     if (ost->audio_channels_mapped) {
 680 //         int i;
 681 //         AVBPrint pan_buf;
 682 //         av_bprint_init(&pan_buf, 256, 8192);
 683 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 684 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 685 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 686 //             if (ost->audio_channels_map[i] != -1)
 687 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 688 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 689 //         av_bprint_finalize(&pan_buf, NULL);
 690 //     }
 691
 692     if (audio_volume != 256) {
 693         char args[256];
 694
 695         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 696                "audio filter instead.\n");
 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         args[0] = 0;
 738         if (ost->swr_filter_type != SWR_FILTER_TYPE_KAISER)
 739             av_strlcatf(args, sizeof(args), "filter_type=%d:", (int)ost->swr_filter_type);
 740         if (ost->swr_dither_method)
 741             av_strlcatf(args, sizeof(args), "dither_method=%d:", (int)ost->swr_dither_method);
 742         if (ost->swr_dither_scale != 1.0)
 743             av_strlcatf(args, sizeof(args), "dither_scale=%f:", ost->swr_dither_scale);
 744         if (strlen(args))
 745             args[strlen(args)-1] = 0;
 746         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 747     }
 748
 749     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 750         return ret;
 751
 752     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 753         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 754                "exactly one input and output.\n", graph_desc);
 755         return AVERROR(EINVAL);
 756     }
 757
 758     for (cur = inputs; !simple && init && cur; cur = cur->next)
 759         init_input_filter(fg, cur);
 760
 761     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 762         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 763             return ret;
 764     avfilter_inout_free(&inputs);
 765
 766     if (!init || simple) {
 767         /* we already know the mappings between lavfi outputs and output streams,
 768          * so we can finish the setup */
 769         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 770             configure_output_filter(fg, fg->outputs[i], cur);
 771         avfilter_inout_free(&outputs);
 772
 773         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 774             return ret;
 775     } else {
 776         /* wait until output mappings are processed */
 777         for (cur = outputs; cur;) {
 778             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 779             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 780                 exit(1);
 781             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 782             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 783             cur = cur->next;
 784             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 785         }
 786     }
 787
 788     return 0;
 789 }
 790
 791 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 792 {
 793     int i;
 794     for (i = 0; i < fg->nb_inputs; i++)
 795         if (fg->inputs[i]->ist == ist)
 796             return 1;
 797     return 0;
 798 }
 799