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/buffersink.h"
  25
  26 #include "libavresample/avresample.h"
  27
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avstring.h"
  30 #include "libavutil/bprint.h"
  31 #include "libavutil/channel_layout.h"
  32 #include "libavutil/opt.h"
  33 #include "libavutil/pixdesc.h"
  34 #include "libavutil/pixfmt.h"
  35 #include "libavutil/imgutils.h"
  36 #include "libavutil/samplefmt.h"
  37
  38 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  39 {
  40     if (codec && codec->pix_fmts) {
  41         const enum AVPixelFormat *p = codec->pix_fmts;
  42         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  43         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  44         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  45         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  46             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  47                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  48             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  49                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  50                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  51             }
  52         }
  53         for (; *p != AV_PIX_FMT_NONE; p++) {
  54             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  55             if (*p == target)
  56                 break;
  57         }
  58         if (*p == AV_PIX_FMT_NONE) {
  59             if (target != AV_PIX_FMT_NONE)
  60                 av_log(NULL, AV_LOG_WARNING,
  61                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  62                        av_get_pix_fmt_name(target),
  63                        codec->name,
  64                        av_get_pix_fmt_name(best));
  65             return best;
  66         }
  67     }
  68     return target;
  69 }
  70
  71 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  72 {
  73     if (codec && codec->sample_fmts) {
  74         const enum AVSampleFormat *p = codec->sample_fmts;
  75         for (; *p != -1; p++) {
  76             if (*p == st->codec->sample_fmt)
  77                 break;
  78         }
  79         if (*p == -1) {
  80             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  81                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  82             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  83             av_log(NULL, AV_LOG_WARNING,
  84                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  85                    av_get_sample_fmt_name(st->codec->sample_fmt),
  86                    codec->name,
  87                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  88             st->codec->sample_fmt = codec->sample_fmts[0];
  89         }
  90     }
  91 }
  92
  93 static char *choose_pix_fmts(OutputStream *ost)
  94 {
  95      if (ost->keep_pix_fmt) {
  96         if (ost->filter)
  97             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  98                                             AVFILTER_AUTO_CONVERT_NONE);
  99         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
 100             return NULL;
 101         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 102     }
 103     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 104         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 105     } else if (ost->enc && ost->enc->pix_fmts) {
 106         const enum AVPixelFormat *p;
 107         AVIOContext *s = NULL;
 108         uint8_t *ret;
 109         int len;
 110
 111         if (avio_open_dyn_buf(&s) < 0)
 112             exit(1);
 113
 114         p = ost->enc->pix_fmts;
 115         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 116             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 117                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 118             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 119                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 120                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 121             }
 122         }
 123
 124         for (; *p != AV_PIX_FMT_NONE; p++) {
 125             const char *name = av_get_pix_fmt_name(*p);
 126             avio_printf(s, "%s|", name);
 127         }
 128         len = avio_close_dyn_buf(s, &ret);
 129         ret[len - 1] = 0;
 130         return ret;
 131     } else
 132         return NULL;
 133 }
 134
 135 /* Define a function for building a string containing a list of
 136  * allowed formats. */
 137 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 138 static char *choose_ ## var ## s(OutputStream *ost)                            \
 139 {                                                                              \
 140     if (ost->st->codec->var != none) {                                         \
 141         get_name(ost->st->codec->var);                                         \
 142         return av_strdup(name);                                                \
 143     } else if (ost->enc && ost->enc->supported_list) {                         \
 144         const type *p;                                                         \
 145         AVIOContext *s = NULL;                                                 \
 146         uint8_t *ret;                                                          \
 147         int len;                                                               \
 148                                                                                \
 149         if (avio_open_dyn_buf(&s) < 0)                                         \
 150             exit(1);                                                           \
 151                                                                                \
 152         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 153             get_name(*p);                                                      \
 154             avio_printf(s, "%s|", name);                                       \
 155         }                                                                      \
 156         len = avio_close_dyn_buf(s, &ret);                                     \
 157         ret[len - 1] = 0;                                                      \
 158         return ret;                                                            \
 159     } else                                                                     \
 160         return NULL;                                                           \
 161 }
 162
 163 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 164 //                   GET_PIX_FMT_NAME)
 165
 166 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 167                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 168
 169 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 170                   GET_SAMPLE_RATE_NAME)
 171
 172 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 173                   GET_CH_LAYOUT_NAME)
 174
 175 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 176 {
 177     FilterGraph *fg = av_mallocz(sizeof(*fg));
 178
 179     if (!fg)
 180         exit(1);
 181     fg->index = nb_filtergraphs;
 182
 183     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 184     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 185         exit(1);
 186     fg->outputs[0]->ost   = ost;
 187     fg->outputs[0]->graph = fg;
 188
 189     ost->filter = fg->outputs[0];
 190
 191     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 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     GROW_ARRAY(ist->filters, ist->nb_filters);
 198     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 199
 200     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 201     filtergraphs[nb_filtergraphs - 1] = fg;
 202
 203     return fg;
 204 }
 205
 206 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 207 {
 208     InputStream *ist = NULL;
 209     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 210     int i;
 211
 212     // TODO: support other filter types
 213     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 214         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 215                "currently.\n");
 216         exit(1);
 217     }
 218
 219     if (in->name) {
 220         AVFormatContext *s;
 221         AVStream       *st = NULL;
 222         char *p;
 223         int file_idx = strtol(in->name, &p, 0);
 224
 225         if (file_idx < 0 || file_idx >= nb_input_files) {
 226             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 227                    file_idx, fg->graph_desc);
 228             exit(1);
 229         }
 230         s = input_files[file_idx]->ctx;
 231
 232         for (i = 0; i < s->nb_streams; i++) {
 233             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 234             if (stream_type != type &&
 235                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 236                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 237                 continue;
 238             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 239                 st = s->streams[i];
 240                 break;
 241             }
 242         }
 243         if (!st) {
 244             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 245                    "matches no streams.\n", p, fg->graph_desc);
 246             exit(1);
 247         }
 248         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 249     } else {
 250         /* find the first unused stream of corresponding type */
 251         for (i = 0; i < nb_input_streams; i++) {
 252             ist = input_streams[i];
 253             if (ist->st->codec->codec_type == type && ist->discard)
 254                 break;
 255         }
 256         if (i == nb_input_streams) {
 257             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 258                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 259                    in->filter_ctx->name);
 260             exit(1);
 261         }
 262     }
 263     av_assert0(ist);
 264
 265     ist->discard         = 0;
 266     ist->decoding_needed++;
 267     ist->st->discard = AVDISCARD_NONE;
 268
 269     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 270     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 271         exit(1);
 272     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 273     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 274
 275     GROW_ARRAY(ist->filters, ist->nb_filters);
 276     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 277 }
 278
 279 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 280 {
 281     char *pix_fmts;
 282     OutputStream *ost = ofilter->ost;
 283     AVCodecContext *codec = ost->st->codec;
 284     AVFilterContext *last_filter = out->filter_ctx;
 285     int pad_idx = out->pad_idx;
 286     int ret;
 287     char name[255];
 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("buffersink"),
 292                                        name, NULL, NULL, fg->graph);
 293
 294     if (ret < 0)
 295         return ret;
 296
 297     if (codec->width || codec->height) {
 298         char args[255];
 299         AVFilterContext *filter;
 300
 301         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 302                  codec->width,
 303                  codec->height,
 304                  (unsigned)ost->sws_flags);
 305         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 306                  ost->file_index, ost->index);
 307         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 308                                                 name, args, NULL, fg->graph)) < 0)
 309             return ret;
 310         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 311             return ret;
 312
 313         last_filter = filter;
 314         pad_idx = 0;
 315     }
 316
 317     if ((pix_fmts = choose_pix_fmts(ost))) {
 318         AVFilterContext *filter;
 319         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 320                  ost->file_index, ost->index);
 321         if ((ret = avfilter_graph_create_filter(&filter,
 322                                                 avfilter_get_by_name("format"),
 323                                                 "format", pix_fmts, NULL,
 324                                                 fg->graph)) < 0)
 325             return ret;
 326         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 327             return ret;
 328
 329         last_filter = filter;
 330         pad_idx     = 0;
 331         av_freep(&pix_fmts);
 332     }
 333
 334     if (ost->frame_rate.num && 0) {
 335         AVFilterContext *fps;
 336         char args[255];
 337
 338         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 339                  ost->frame_rate.den);
 340         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 341                  ost->file_index, ost->index);
 342         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 343                                            name, args, NULL, fg->graph);
 344         if (ret < 0)
 345             return ret;
 346
 347         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 348         if (ret < 0)
 349             return ret;
 350         last_filter = fps;
 351         pad_idx = 0;
 352     }
 353
 354     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 355         return ret;
 356
 357     return 0;
 358 }
 359
 360 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 361 {
 362     OutputStream *ost = ofilter->ost;
 363     AVCodecContext *codec  = ost->st->codec;
 364     AVFilterContext *last_filter = out->filter_ctx;
 365     int pad_idx = out->pad_idx;
 366     char *sample_fmts, *sample_rates, *channel_layouts;
 367     char name[255];
 368     int ret;
 369
 370     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 371     ret = avfilter_graph_create_filter(&ofilter->filter,
 372                                        avfilter_get_by_name("abuffersink"),
 373                                        name, NULL, NULL, fg->graph);
 374     if (ret < 0)
 375         return ret;
 376     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 377         return ret;
 378
 379 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 380     AVFilterContext *filt_ctx;                                              \
 381                                                                             \
 382     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 383            "similarly to -af " filter_name "=%s.\n", arg);                  \
 384                                                                             \
 385     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 386                                        avfilter_get_by_name(filter_name),   \
 387                                        filter_name, arg, NULL, fg->graph);  \
 388     if (ret < 0)                                                            \
 389         return ret;                                                         \
 390                                                                             \
 391     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 392     if (ret < 0)                                                            \
 393         return ret;                                                         \
 394                                                                             \
 395     last_filter = filt_ctx;                                                 \
 396     pad_idx = 0;                                                            \
 397 } while (0)
 398     if (ost->audio_channels_mapped) {
 399         int i;
 400         AVBPrint pan_buf;
 401         av_bprint_init(&pan_buf, 256, 8192);
 402         av_bprintf(&pan_buf, "0x%"PRIx64,
 403                    av_get_default_channel_layout(ost->audio_channels_mapped));
 404         for (i = 0; i < ost->audio_channels_mapped; i++)
 405             if (ost->audio_channels_map[i] != -1)
 406                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 407
 408         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 409         av_bprint_finalize(&pan_buf, NULL);
 410     }
 411
 412     if (codec->channels && !codec->channel_layout)
 413         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 414
 415     sample_fmts     = choose_sample_fmts(ost);
 416     sample_rates    = choose_sample_rates(ost);
 417     channel_layouts = choose_channel_layouts(ost);
 418     if (sample_fmts || sample_rates || channel_layouts) {
 419         AVFilterContext *format;
 420         char args[256];
 421         args[0] = 0;
 422
 423         if (sample_fmts)
 424             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 425                             sample_fmts);
 426         if (sample_rates)
 427             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 428                             sample_rates);
 429         if (channel_layouts)
 430             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 431                             channel_layouts);
 432
 433         av_freep(&sample_fmts);
 434         av_freep(&sample_rates);
 435         av_freep(&channel_layouts);
 436
 437         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 438                  ost->file_index, ost->index);
 439         ret = avfilter_graph_create_filter(&format,
 440                                            avfilter_get_by_name("aformat"),
 441                                            name, args, NULL, fg->graph);
 442         if (ret < 0)
 443             return ret;
 444
 445         ret = avfilter_link(last_filter, pad_idx, format, 0);
 446         if (ret < 0)
 447             return ret;
 448
 449         last_filter = format;
 450         pad_idx = 0;
 451     }
 452
 453     if (audio_volume != 256 && 0) {
 454         char args[256];
 455
 456         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 457         AUTO_INSERT_FILTER("-vol", "volume", args);
 458     }
 459
 460     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 461         return ret;
 462
 463     return 0;
 464 }
 465
 466 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 467 {                                                                  \
 468     AVFilterContext *ctx = inout->filter_ctx;                      \
 469     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 470     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 471     AVIOContext *pb;                                               \
 472                                                                    \
 473     if (avio_open_dyn_buf(&pb) < 0)                                \
 474         exit(1);                                                   \
 475                                                                    \
 476     avio_printf(pb, "%s", ctx->filter->name);                      \
 477     if (nb_pads > 1)                                               \
 478         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 479     avio_w8(pb, 0);                                                \
 480     avio_close_dyn_buf(pb, &f->name);                              \
 481 }
 482
 483 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 484 {
 485     av_freep(&ofilter->name);
 486     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 487
 488     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 489     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 490     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 491     default: av_assert0(0);
 492     }
 493 }
 494
 495 static int sub2video_prepare(InputStream *ist)
 496 {
 497     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 498     int i, w, h;
 499
 500     /* Compute the size of the canvas for the subtitles stream.
 501        If the subtitles codec has set a size, use it. Otherwise use the
 502        maximum dimensions of the video streams in the same file. */
 503     w = ist->st->codec->width;
 504     h = ist->st->codec->height;
 505     if (!(w && h)) {
 506         for (i = 0; i < avf->nb_streams; i++) {
 507             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 508                 w = FFMAX(w, avf->streams[i]->codec->width);
 509                 h = FFMAX(h, avf->streams[i]->codec->height);
 510             }
 511         }
 512         if (!(w && h)) {
 513             w = FFMAX(w, 720);
 514             h = FFMAX(h, 576);
 515         }
 516         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 517     }
 518     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
 519     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
 520
 521     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 522        palettes for all rectangles are identical or compatible */
 523     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 524
 525     ist->sub2video.frame = av_frame_alloc();
 526     if (!ist->sub2video.frame)
 527         return AVERROR(ENOMEM);
 528     return 0;
 529 }
 530
 531 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 532                                         AVFilterInOut *in)
 533 {
 534     AVFilterContext *first_filter = in->filter_ctx;
 535     AVFilter *filter = avfilter_get_by_name("buffer");
 536     InputStream *ist = ifilter->ist;
 537     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 538                                          ist->st->time_base;
 539     AVRational fr = ist->framerate;
 540     AVRational sar;
 541     AVBPrint args;
 542     char name[255];
 543     int pad_idx = in->pad_idx;
 544     int ret;
 545
 546     if (!fr.num)
 547         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 548
 549     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 550         ret = sub2video_prepare(ist);
 551         if (ret < 0)
 552             return ret;
 553     }
 554
 555     sar = ist->st->sample_aspect_ratio.num ?
 556           ist->st->sample_aspect_ratio :
 557           ist->st->codec->sample_aspect_ratio;
 558     if(!sar.den)
 559         sar = (AVRational){0,1};
 560     av_bprint_init(&args, 0, 1);
 561     av_bprintf(&args,
 562              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 563              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 564              ist->resample_height, ist->resample_pix_fmt,
 565              tb.num, tb.den, sar.num, sar.den,
 566              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 567     if (fr.num && fr.den)
 568         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 569     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 570              ist->file_index, ist->st->index);
 571
 572     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 573                                             args.str, NULL, fg->graph)) < 0)
 574         return ret;
 575
 576     if (ist->framerate.num) {
 577         AVFilterContext *setpts;
 578
 579         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 580                  ist->file_index, ist->st->index);
 581         if ((ret = avfilter_graph_create_filter(&setpts,
 582                                                 avfilter_get_by_name("setpts"),
 583                                                 name, "N", NULL,
 584                                                 fg->graph)) < 0)
 585             return ret;
 586
 587         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 588             return ret;
 589
 590         first_filter = setpts;
 591         pad_idx = 0;
 592     }
 593
 594     if (do_deinterlace) {
 595         AVFilterContext *yadif;
 596
 597         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 598                  ist->file_index, ist->st->index);
 599         if ((ret = avfilter_graph_create_filter(&yadif,
 600                                                 avfilter_get_by_name("yadif"),
 601                                                 name, "", NULL,
 602                                                 fg->graph)) < 0)
 603             return ret;
 604
 605         if ((ret = avfilter_link(yadif, 0, first_filter, pad_idx)) < 0)
 606             return ret;
 607
 608         first_filter = yadif;
 609         pad_idx = 0;
 610     }
 611
 612     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 613         return ret;
 614     return 0;
 615 }
 616
 617 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 618                                         AVFilterInOut *in)
 619 {
 620     AVFilterContext *first_filter = in->filter_ctx;
 621     AVFilter *filter = avfilter_get_by_name("abuffer");
 622     InputStream *ist = ifilter->ist;
 623     int pad_idx = in->pad_idx;
 624     AVBPrint args;
 625     char name[255];
 626     int ret;
 627
 628     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 629     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 630              1, ist->st->codec->sample_rate,
 631              ist->st->codec->sample_rate,
 632              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 633     if (ist->st->codec->channel_layout)
 634         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 635                    ist->st->codec->channel_layout);
 636     else
 637         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 638     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 639              ist->file_index, ist->st->index);
 640
 641     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 642                                             name, args.str, NULL,
 643                                             fg->graph)) < 0)
 644         return ret;
 645
 646 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 647     AVFilterContext *filt_ctx;                                              \
 648                                                                             \
 649     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 650            "similarly to -af " filter_name "=%s.\n", arg);                  \
 651                                                                             \
 652     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 653                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 654     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 655                                        avfilter_get_by_name(filter_name),   \
 656                                        name, arg, NULL, fg->graph);         \
 657     if (ret < 0)                                                            \
 658         return ret;                                                         \
 659                                                                             \
 660     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 661     if (ret < 0)                                                            \
 662         return ret;                                                         \
 663                                                                             \
 664     first_filter = filt_ctx;                                                  \
 665 } while (0)
 666
 667     if (audio_sync_method > 0) {
 668         char args[256] = {0};
 669
 670         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 671         if (audio_drift_threshold != 0.1)
 672             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 673         if (!fg->reconfiguration)
 674             av_strlcatf(args, sizeof(args), ":first_pts=0");
 675         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 676     }
 677
 678 //     if (ost->audio_channels_mapped) {
 679 //         int i;
 680 //         AVBPrint pan_buf;
 681 //         av_bprint_init(&pan_buf, 256, 8192);
 682 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 683 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 684 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 685 //             if (ost->audio_channels_map[i] != -1)
 686 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 687 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 688 //         av_bprint_finalize(&pan_buf, NULL);
 689 //     }
 690
 691     if (audio_volume != 256) {
 692         char args[256];
 693
 694         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 695                "audio filter instead.\n");
 696
 697         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 698         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 699     }
 700     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 701         return ret;
 702
 703     return 0;
 704 }
 705
 706 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 707                                   AVFilterInOut *in)
 708 {
 709     av_freep(&ifilter->name);
 710     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 711
 712     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 713     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 714     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 715     default: av_assert0(0);
 716     }
 717 }
 718
 719 int configure_filtergraph(FilterGraph *fg)
 720 {
 721     AVFilterInOut *inputs, *outputs, *cur;
 722     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 723     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 724                                       fg->graph_desc;
 725
 726     avfilter_graph_free(&fg->graph);
 727     if (!(fg->graph = avfilter_graph_alloc()))
 728         return AVERROR(ENOMEM);
 729
 730     if (simple) {
 731         OutputStream *ost = fg->outputs[0]->ost;
 732         char args[512];
 733         AVDictionaryEntry *e = NULL;
 734
 735         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 736         fg->graph->scale_sws_opts = av_strdup(args);
 737
 738         args[0] = 0;
 739         while ((e = av_dict_get(ost->swr_opts, "", e,
 740                                 AV_DICT_IGNORE_SUFFIX))) {
 741             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 742         }
 743         if (strlen(args))
 744             args[strlen(args)-1] = 0;
 745         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 746
 747         args[0] = '\0';
 748         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 749                                 AV_DICT_IGNORE_SUFFIX))) {
 750             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 751         }
 752         if (strlen(args))
 753             args[strlen(args) - 1] = '\0';
 754         fg->graph->resample_lavr_opts = av_strdup(args);
 755     }
 756
 757     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 758         return ret;
 759
 760     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 761         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 762                "exactly one input and output.\n", graph_desc);
 763         return AVERROR(EINVAL);
 764     }
 765
 766     for (cur = inputs; !simple && init && cur; cur = cur->next)
 767         init_input_filter(fg, cur);
 768
 769     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 770         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 771             return ret;
 772     avfilter_inout_free(&inputs);
 773
 774     if (!init || simple) {
 775         /* we already know the mappings between lavfi outputs and output streams,
 776          * so we can finish the setup */
 777         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 778             configure_output_filter(fg, fg->outputs[i], cur);
 779         avfilter_inout_free(&outputs);
 780
 781         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 782             return ret;
 783     } else {
 784         /* wait until output mappings are processed */
 785         for (cur = outputs; cur;) {
 786             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 787             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 788                 exit(1);
 789             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 790             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 791             cur = cur->next;
 792             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 793         }
 794     }
 795
 796     fg->reconfiguration = 1;
 797     return 0;
 798 }
 799
 800 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 801 {
 802     int i;
 803     for (i = 0; i < fg->nb_inputs; i++)
 804         if (fg->inputs[i]->ist == ist)
 805             return 1;
 806     return 0;
 807 }
 808