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 AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  37 {
  38     if (codec && codec->pix_fmts) {
  39         const enum AVPixelFormat *p = codec->pix_fmts;
  40         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  41         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  42         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  43         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  44             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  45                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  46             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  47                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  48                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  49             }
  50         }
  51         for (; *p != AV_PIX_FMT_NONE; p++) {
  52             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  53             if (*p == target)
  54                 break;
  55         }
  56         if (*p == AV_PIX_FMT_NONE) {
  57             if (target != AV_PIX_FMT_NONE)
  58                 av_log(NULL, AV_LOG_WARNING,
  59                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  60                        av_get_pix_fmt_name(target),
  61                        codec->name,
  62                        av_get_pix_fmt_name(best));
  63             return best;
  64         }
  65     }
  66     return target;
  67 }
  68
  69 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  70 {
  71     if (codec && codec->sample_fmts) {
  72         const enum AVSampleFormat *p = codec->sample_fmts;
  73         for (; *p != -1; p++) {
  74             if (*p == st->codec->sample_fmt)
  75                 break;
  76         }
  77         if (*p == -1) {
  78             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  79                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  80             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  81             av_log(NULL, AV_LOG_WARNING,
  82                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  83                    av_get_sample_fmt_name(st->codec->sample_fmt),
  84                    codec->name,
  85                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  86             st->codec->sample_fmt = codec->sample_fmts[0];
  87         }
  88     }
  89 }
  90
  91 static char *choose_pix_fmts(OutputStream *ost)
  92 {
  93      if (ost->keep_pix_fmt) {
  94         if (ost->filter)
  95             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  96                                             AVFILTER_AUTO_CONVERT_NONE);
  97         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
  98             return NULL;
  99         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 100     }
 101     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 102         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 103     } else if (ost->enc && ost->enc->pix_fmts) {
 104         const enum AVPixelFormat *p;
 105         AVIOContext *s = NULL;
 106         uint8_t *ret;
 107         int len;
 108
 109         if (avio_open_dyn_buf(&s) < 0)
 110             exit(1);
 111
 112         p = ost->enc->pix_fmts;
 113         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 114             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 115                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 116             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 117                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 118                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 119             }
 120         }
 121
 122         for (; *p != AV_PIX_FMT_NONE; p++) {
 123             const char *name = av_get_pix_fmt_name(*p);
 124             avio_printf(s, "%s:", name);
 125         }
 126         len = avio_close_dyn_buf(s, &ret);
 127         ret[len - 1] = 0;
 128         return ret;
 129     } else
 130         return NULL;
 131 }
 132
 133 /* Define a function for building a string containing a list of
 134  * allowed formats. */
 135 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
 136 static char *choose_ ## var ## s(OutputStream *ost)                            \
 137 {                                                                              \
 138     if (ost->st->codec->var != none) {                                         \
 139         get_name(ost->st->codec->var);                                         \
 140         return av_strdup(name);                                                \
 141     } else if (ost->enc->supported_list) {                                     \
 142         const type *p;                                                         \
 143         AVIOContext *s = NULL;                                                 \
 144         uint8_t *ret;                                                          \
 145         int len;                                                               \
 146                                                                                \
 147         if (avio_open_dyn_buf(&s) < 0)                                         \
 148             exit(1);                                                           \
 149                                                                                \
 150         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 151             get_name(*p);                                                      \
 152             avio_printf(s, "%s" separator, name);                              \
 153         }                                                                      \
 154         len = avio_close_dyn_buf(s, &ret);                                     \
 155         ret[len - 1] = 0;                                                      \
 156         return ret;                                                            \
 157     } else                                                                     \
 158         return NULL;                                                           \
 159 }
 160
 161 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 162 //                   GET_PIX_FMT_NAME, ":")
 163
 164 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 165                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
 166
 167 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 168                   GET_SAMPLE_RATE_NAME, ",")
 169
 170 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 171                   GET_CH_LAYOUT_NAME, ",")
 172
 173 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 174 {
 175     FilterGraph *fg = av_mallocz(sizeof(*fg));
 176
 177     if (!fg)
 178         exit(1);
 179     fg->index = nb_filtergraphs;
 180
 181     fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
 182                              fg->nb_outputs + 1);
 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     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
 191                             fg->nb_inputs + 1);
 192     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 193         exit(1);
 194     fg->inputs[0]->ist   = ist;
 195     fg->inputs[0]->graph = fg;
 196
 197     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 198                               &ist->nb_filters, ist->nb_filters + 1);
 199     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 200
 201     filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
 202                               &nb_filtergraphs, nb_filtergraphs + 1);
 203     filtergraphs[nb_filtergraphs - 1] = fg;
 204
 205     return fg;
 206 }
 207
 208 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 209 {
 210     InputStream *ist = NULL;
 211     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 212     int i;
 213
 214     // TODO: support other filter types
 215     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 216         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 217                "currently.\n");
 218         exit(1);
 219     }
 220
 221     if (in->name) {
 222         AVFormatContext *s;
 223         AVStream       *st = NULL;
 224         char *p;
 225         int file_idx = strtol(in->name, &p, 0);
 226
 227         if (file_idx < 0 || file_idx >= nb_input_files) {
 228             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 229                    file_idx, fg->graph_desc);
 230             exit(1);
 231         }
 232         s = input_files[file_idx]->ctx;
 233
 234         for (i = 0; i < s->nb_streams; i++) {
 235             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 236             if (stream_type != type &&
 237                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 238                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 239                 continue;
 240             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 241                 st = s->streams[i];
 242                 break;
 243             }
 244         }
 245         if (!st) {
 246             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 247                    "matches no streams.\n", p, fg->graph_desc);
 248             exit(1);
 249         }
 250         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 251     } else {
 252         /* find the first unused stream of corresponding type */
 253         for (i = 0; i < nb_input_streams; i++) {
 254             ist = input_streams[i];
 255             if (ist->st->codec->codec_type == type && ist->discard)
 256                 break;
 257         }
 258         if (i == nb_input_streams) {
 259             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 260                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 261                    in->filter_ctx->name);
 262             exit(1);
 263         }
 264     }
 265     av_assert0(ist);
 266
 267     ist->discard         = 0;
 268     ist->decoding_needed++;
 269     ist->st->discard = AVDISCARD_NONE;
 270
 271     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
 272                             &fg->nb_inputs, fg->nb_inputs + 1);
 273     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 274         exit(1);
 275     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 276     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 277
 278     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 279                               &ist->nb_filters, ist->nb_filters + 1);
 280     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 281 }
 282
 283 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 284 {
 285     char *pix_fmts;
 286     OutputStream *ost = ofilter->ost;
 287     AVCodecContext *codec = ost->st->codec;
 288     AVFilterContext *last_filter = out->filter_ctx;
 289     int pad_idx = out->pad_idx;
 290     int ret;
 291     char name[255];
 292     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
 293
 294     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 295     ret = avfilter_graph_create_filter(&ofilter->filter,
 296                                        avfilter_get_by_name("ffbuffersink"),
 297                                        name, NULL, NULL, fg->graph);
 298     av_freep(&buffersink_params);
 299
 300     if (ret < 0)
 301         return ret;
 302
 303     if (codec->width || codec->height) {
 304         char args[255];
 305         AVFilterContext *filter;
 306
 307         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 308                  codec->width,
 309                  codec->height,
 310                  (unsigned)ost->sws_flags);
 311         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 312                  ost->file_index, ost->index);
 313         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 314                                                 name, args, NULL, fg->graph)) < 0)
 315             return ret;
 316         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 317             return ret;
 318
 319         last_filter = filter;
 320         pad_idx = 0;
 321     }
 322
 323     if ((pix_fmts = choose_pix_fmts(ost))) {
 324         AVFilterContext *filter;
 325         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 326                  ost->file_index, ost->index);
 327         if ((ret = avfilter_graph_create_filter(&filter,
 328                                                 avfilter_get_by_name("format"),
 329                                                 "format", pix_fmts, NULL,
 330                                                 fg->graph)) < 0)
 331             return ret;
 332         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 333             return ret;
 334
 335         last_filter = filter;
 336         pad_idx     = 0;
 337         av_freep(&pix_fmts);
 338     }
 339
 340     if (ost->frame_rate.num && 0) {
 341         AVFilterContext *fps;
 342         char args[255];
 343
 344         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 345                  ost->frame_rate.den);
 346         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 347                  ost->file_index, ost->index);
 348         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 349                                            name, args, NULL, fg->graph);
 350         if (ret < 0)
 351             return ret;
 352
 353         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 354         if (ret < 0)
 355             return ret;
 356         last_filter = fps;
 357         pad_idx = 0;
 358     }
 359
 360     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 361         return ret;
 362
 363     return 0;
 364 }
 365
 366 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 367 {
 368     OutputStream *ost = ofilter->ost;
 369     AVCodecContext *codec  = ost->st->codec;
 370     AVFilterContext *last_filter = out->filter_ctx;
 371     int pad_idx = out->pad_idx;
 372     char *sample_fmts, *sample_rates, *channel_layouts;
 373     char name[255];
 374     int ret;
 375
 376
 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, NULL, fg->graph);
 381     if (ret < 0)
 382         return ret;
 383
 384 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 385     AVFilterContext *filt_ctx;                                              \
 386                                                                             \
 387     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 388            "similarly to -af " filter_name "=%s.\n", arg);                  \
 389                                                                             \
 390     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 391                                        avfilter_get_by_name(filter_name),   \
 392                                        filter_name, arg, NULL, fg->graph);  \
 393     if (ret < 0)                                                            \
 394         return ret;                                                         \
 395                                                                             \
 396     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 397     if (ret < 0)                                                            \
 398         return ret;                                                         \
 399                                                                             \
 400     last_filter = filt_ctx;                                                 \
 401     pad_idx = 0;                                                            \
 402 } while (0)
 403     if (ost->audio_channels_mapped) {
 404         int i;
 405         AVBPrint pan_buf;
 406         av_bprint_init(&pan_buf, 256, 8192);
 407         av_bprintf(&pan_buf, "0x%"PRIx64,
 408                    av_get_default_channel_layout(ost->audio_channels_mapped));
 409         for (i = 0; i < ost->audio_channels_mapped; i++)
 410             if (ost->audio_channels_map[i] != -1)
 411                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 412
 413         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 414         av_bprint_finalize(&pan_buf, NULL);
 415     }
 416
 417     if (codec->channels && !codec->channel_layout)
 418         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 419
 420     sample_fmts     = choose_sample_fmts(ost);
 421     sample_rates    = choose_sample_rates(ost);
 422     channel_layouts = choose_channel_layouts(ost);
 423     if (sample_fmts || sample_rates || channel_layouts) {
 424         AVFilterContext *format;
 425         char args[256];
 426         args[0] = 0;
 427
 428         if (sample_fmts)
 429             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 430                             sample_fmts);
 431         if (sample_rates)
 432             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 433                             sample_rates);
 434         if (channel_layouts)
 435             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 436                             channel_layouts);
 437
 438         av_freep(&sample_fmts);
 439         av_freep(&sample_rates);
 440         av_freep(&channel_layouts);
 441
 442         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 443                  ost->file_index, ost->index);
 444         ret = avfilter_graph_create_filter(&format,
 445                                            avfilter_get_by_name("aformat"),
 446                                            name, args, NULL, fg->graph);
 447         if (ret < 0)
 448             return ret;
 449
 450         ret = avfilter_link(last_filter, pad_idx, format, 0);
 451         if (ret < 0)
 452             return ret;
 453
 454         last_filter = format;
 455         pad_idx = 0;
 456     }
 457
 458     if (audio_volume != 256 && 0) {
 459         char args[256];
 460
 461         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 462         AUTO_INSERT_FILTER("-vol", "volume", args);
 463     }
 464
 465     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 466         return ret;
 467
 468     return 0;
 469 }
 470
 471 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 472 {                                                                  \
 473     AVFilterContext *ctx = inout->filter_ctx;                      \
 474     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 475     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 476     AVIOContext *pb;                                               \
 477                                                                    \
 478     if (avio_open_dyn_buf(&pb) < 0)                                \
 479         exit(1);                                                   \
 480                                                                    \
 481     avio_printf(pb, "%s", ctx->filter->name);                      \
 482     if (nb_pads > 1)                                               \
 483         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 484     avio_w8(pb, 0);                                                \
 485     avio_close_dyn_buf(pb, &f->name);                              \
 486 }
 487
 488 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 489 {
 490     av_freep(&ofilter->name);
 491     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 492
 493     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 494     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 495     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 496     default: av_assert0(0);
 497     }
 498 }
 499
 500 static int sub2video_prepare(InputStream *ist)
 501 {
 502     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 503     int i, ret, w, h;
 504     uint8_t *image[4];
 505     int linesize[4];
 506
 507     /* Compute the size of the canvas for the subtitles stream.
 508        If the subtitles codec has set a size, use it. Otherwise use the
 509        maximum dimensions of the video streams in the same file. */
 510     w = ist->st->codec->width;
 511     h = ist->st->codec->height;
 512     if (!(w && h)) {
 513         for (i = 0; i < avf->nb_streams; i++) {
 514             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 515                 w = FFMAX(w, avf->streams[i]->codec->width);
 516                 h = FFMAX(h, avf->streams[i]->codec->height);
 517             }
 518         }
 519         if (!(w && h)) {
 520             w = FFMAX(w, 720);
 521             h = FFMAX(h, 576);
 522         }
 523         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 524     }
 525     ist->sub2video.w = ist->st->codec->width  = w;
 526     ist->sub2video.h = ist->st->codec->height = h;
 527
 528     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 529        palettes for all rectangles are identical or compatible */
 530     ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 531
 532     ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
 533     if (ret < 0)
 534         return ret;
 535     memset(image[0], 0, h * linesize[0]);
 536     ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
 537             image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
 538             w, h, AV_PIX_FMT_RGB32);
 539     if (!ist->sub2video.ref) {
 540         av_free(image[0]);
 541         return AVERROR(ENOMEM);
 542     }
 543     return 0;
 544 }
 545
 546 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 547                                         AVFilterInOut *in)
 548 {
 549     AVFilterContext *first_filter = in->filter_ctx;
 550     AVFilter *filter = avfilter_get_by_name("buffer");
 551     InputStream *ist = ifilter->ist;
 552     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 553                                          ist->st->time_base;
 554     AVRational fr = ist->framerate.num ? ist->framerate :
 555                                          ist->st->r_frame_rate;
 556     AVRational sar;
 557     AVBPrint args;
 558     char name[255];
 559     int pad_idx = in->pad_idx;
 560     int ret;
 561
 562     if (!ist->framerate.num && ist->st->codec->ticks_per_frame>1) {
 563         AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
 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             fr = codec_fr;
 567     }
 568
 569     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 570         ret = sub2video_prepare(ist);
 571         if (ret < 0)
 572             return ret;
 573     }
 574
 575     sar = ist->st->sample_aspect_ratio.num ?
 576           ist->st->sample_aspect_ratio :
 577           ist->st->codec->sample_aspect_ratio;
 578     if(!sar.den)
 579         sar = (AVRational){0,1};
 580     av_bprint_init(&args, 0, 1);
 581     av_bprintf(&args,
 582              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 583              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->st->codec->width,
 584              ist->st->codec->height, ist->st->codec->pix_fmt,
 585              tb.num, tb.den, sar.num, sar.den,
 586              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 587     if (fr.num && fr.den)
 588         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 589     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 590              ist->file_index, ist->st->index);
 591
 592     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 593                                             args.str, NULL, fg->graph)) < 0)
 594         return ret;
 595
 596     if (ist->framerate.num) {
 597         AVFilterContext *setpts;
 598
 599         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 600                  ist->file_index, ist->st->index);
 601         if ((ret = avfilter_graph_create_filter(&setpts,
 602                                                 avfilter_get_by_name("setpts"),
 603                                                 name, "N", NULL,
 604                                                 fg->graph)) < 0)
 605             return ret;
 606
 607         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 608             return ret;
 609
 610         first_filter = setpts;
 611         pad_idx = 0;
 612     }
 613
 614     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 615         return ret;
 616     return 0;
 617 }
 618
 619 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 620                                         AVFilterInOut *in)
 621 {
 622     AVFilterContext *first_filter = in->filter_ctx;
 623     AVFilter *filter = avfilter_get_by_name("abuffer");
 624     InputStream *ist = ifilter->ist;
 625     int pad_idx = in->pad_idx;
 626     char args[255], name[255];
 627     int ret;
 628
 629     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
 630              ":channel_layout=0x%"PRIx64,
 631              1, ist->st->codec->sample_rate,
 632              ist->st->codec->sample_rate,
 633              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
 634              ist->st->codec->channel_layout);
 635     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 636              ist->file_index, ist->st->index);
 637
 638     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 639                                             name, args, NULL,
 640                                             fg->graph)) < 0)
 641         return ret;
 642
 643 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 644     AVFilterContext *filt_ctx;                                              \
 645                                                                             \
 646     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 647            "similarly to -af " filter_name "=%s.\n", arg);                  \
 648                                                                             \
 649     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 650                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 651     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 652                                        avfilter_get_by_name(filter_name),   \
 653                                        name, arg, NULL, fg->graph);         \
 654     if (ret < 0)                                                            \
 655         return ret;                                                         \
 656                                                                             \
 657     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 658     if (ret < 0)                                                            \
 659         return ret;                                                         \
 660                                                                             \
 661     first_filter = filt_ctx;                                                  \
 662 } while (0)
 663
 664     if (audio_sync_method > 0) {
 665         char args[256] = {0};
 666
 667         av_strlcatf(args, sizeof(args), "min_comp=0.001:min_hard_comp=%f", audio_drift_threshold);
 668         if (audio_sync_method > 1)
 669             av_strlcatf(args, sizeof(args), ":max_soft_comp=%f", audio_sync_method/(double)ist->st->codec->sample_rate);
 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         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 690         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 691     }
 692     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 693         return ret;
 694
 695     return 0;
 696 }
 697
 698 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 699                                   AVFilterInOut *in)
 700 {
 701     av_freep(&ifilter->name);
 702     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 703
 704     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 705     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 706     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 707     default: av_assert0(0);
 708     }
 709 }
 710
 711 int configure_filtergraph(FilterGraph *fg)
 712 {
 713     AVFilterInOut *inputs, *outputs, *cur;
 714     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 715     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 716                                       fg->graph_desc;
 717
 718     avfilter_graph_free(&fg->graph);
 719     if (!(fg->graph = avfilter_graph_alloc()))
 720         return AVERROR(ENOMEM);
 721
 722     if (simple) {
 723         OutputStream *ost = fg->outputs[0]->ost;
 724         char args[255];
 725         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 726         fg->graph->scale_sws_opts = av_strdup(args);
 727     }
 728
 729     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 730         return ret;
 731
 732     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 733         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 734                "exactly one input and output.\n", graph_desc);
 735         return AVERROR(EINVAL);
 736     }
 737
 738     for (cur = inputs; !simple && init && cur; cur = cur->next)
 739         init_input_filter(fg, cur);
 740
 741     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 742         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 743             return ret;
 744     avfilter_inout_free(&inputs);
 745
 746     if (!init || simple) {
 747         /* we already know the mappings between lavfi outputs and output streams,
 748          * so we can finish the setup */
 749         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 750             configure_output_filter(fg, fg->outputs[i], cur);
 751         avfilter_inout_free(&outputs);
 752
 753         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 754             return ret;
 755     } else {
 756         /* wait until output mappings are processed */
 757         for (cur = outputs; cur;) {
 758             fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
 759                                      &fg->nb_outputs, fg->nb_outputs + 1);
 760             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 761                 exit(1);
 762             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 763             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 764             cur = cur->next;
 765             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 766         }
 767     }
 768
 769     return 0;
 770 }
 771
 772 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 773 {
 774     int i;
 775     for (i = 0; i < fg->nb_inputs; i++)
 776         if (fg->inputs[i]->ist == ist)
 777             return 1;
 778     return 0;
 779 }
 780