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 <stdint.h>
  22
  23 #include "ffmpeg.h"
  24
  25 #include "libavfilter/avfilter.h"
  26 #include "libavfilter/buffersink.h"
  27
  28 #include "libavresample/avresample.h"
  29
  30 #include "libavutil/avassert.h"
  31 #include "libavutil/avstring.h"
  32 #include "libavutil/bprint.h"
  33 #include "libavutil/channel_layout.h"
  34 #include "libavutil/opt.h"
  35 #include "libavutil/pixdesc.h"
  36 #include "libavutil/pixfmt.h"
  37 #include "libavutil/imgutils.h"
  38 #include "libavutil/samplefmt.h"
  39
  40 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  41 {
  42     if (codec && codec->pix_fmts) {
  43         const enum AVPixelFormat *p = codec->pix_fmts;
  44         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  45         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  46         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  47         static const enum AVPixelFormat mjpeg_formats[] =
  48             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  49         static const enum AVPixelFormat ljpeg_formats[] =
  50             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  51               AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  52
  53         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  54             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  55                 p = mjpeg_formats;
  56             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  57                 p =ljpeg_formats;
  58             }
  59         }
  60         for (; *p != AV_PIX_FMT_NONE; p++) {
  61             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  62             if (*p == target)
  63                 break;
  64         }
  65         if (*p == AV_PIX_FMT_NONE) {
  66             if (target != AV_PIX_FMT_NONE)
  67                 av_log(NULL, AV_LOG_WARNING,
  68                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  69                        av_get_pix_fmt_name(target),
  70                        codec->name,
  71                        av_get_pix_fmt_name(best));
  72             return best;
  73         }
  74     }
  75     return target;
  76 }
  77
  78 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  79 {
  80     if (codec && codec->sample_fmts) {
  81         const enum AVSampleFormat *p = codec->sample_fmts;
  82         for (; *p != -1; p++) {
  83             if (*p == st->codec->sample_fmt)
  84                 break;
  85         }
  86         if (*p == -1) {
  87             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  88                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  89             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  90             av_log(NULL, AV_LOG_WARNING,
  91                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  92                    av_get_sample_fmt_name(st->codec->sample_fmt),
  93                    codec->name,
  94                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  95             st->codec->sample_fmt = codec->sample_fmts[0];
  96         }
  97     }
  98 }
  99
 100 static char *choose_pix_fmts(OutputStream *ost)
 101 {
 102     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
 103     if (strict_dict)
 104         // used by choose_pixel_fmt() and below
 105         av_opt_set(ost->st->codec, "strict", strict_dict->value, 0);
 106
 107      if (ost->keep_pix_fmt) {
 108         if (ost->filter)
 109             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
 110                                             AVFILTER_AUTO_CONVERT_NONE);
 111         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
 112             return NULL;
 113         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 114     }
 115     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 116         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 117     } else if (ost->enc && ost->enc->pix_fmts) {
 118         const enum AVPixelFormat *p;
 119         AVIOContext *s = NULL;
 120         uint8_t *ret;
 121         int len;
 122
 123         if (avio_open_dyn_buf(&s) < 0)
 124             exit_program(1);
 125
 126         p = ost->enc->pix_fmts;
 127         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 128             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 129                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 130             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 131                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 132                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 133             }
 134         }
 135
 136         for (; *p != AV_PIX_FMT_NONE; p++) {
 137             const char *name = av_get_pix_fmt_name(*p);
 138             avio_printf(s, "%s|", name);
 139         }
 140         len = avio_close_dyn_buf(s, &ret);
 141         ret[len - 1] = 0;
 142         return ret;
 143     } else
 144         return NULL;
 145 }
 146
 147 /* Define a function for building a string containing a list of
 148  * allowed formats. */
 149 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 150 static char *choose_ ## var ## s(OutputStream *ost)                            \
 151 {                                                                              \
 152     if (ost->st->codec->var != none) {                                         \
 153         get_name(ost->st->codec->var);                                         \
 154         return av_strdup(name);                                                \
 155     } else if (ost->enc && ost->enc->supported_list) {                         \
 156         const type *p;                                                         \
 157         AVIOContext *s = NULL;                                                 \
 158         uint8_t *ret;                                                          \
 159         int len;                                                               \
 160                                                                                \
 161         if (avio_open_dyn_buf(&s) < 0)                                         \
 162             exit_program(1);                                                           \
 163                                                                                \
 164         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 165             get_name(*p);                                                      \
 166             avio_printf(s, "%s|", name);                                       \
 167         }                                                                      \
 168         len = avio_close_dyn_buf(s, &ret);                                     \
 169         ret[len - 1] = 0;                                                      \
 170         return ret;                                                            \
 171     } else                                                                     \
 172         return NULL;                                                           \
 173 }
 174
 175 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 176 //                   GET_PIX_FMT_NAME)
 177
 178 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 179                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 180
 181 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 182                   GET_SAMPLE_RATE_NAME)
 183
 184 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 185                   GET_CH_LAYOUT_NAME)
 186
 187 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 188 {
 189     FilterGraph *fg = av_mallocz(sizeof(*fg));
 190
 191     if (!fg)
 192         exit_program(1);
 193     fg->index = nb_filtergraphs;
 194
 195     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 196     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 197         exit_program(1);
 198     fg->outputs[0]->ost   = ost;
 199     fg->outputs[0]->graph = fg;
 200
 201     ost->filter = fg->outputs[0];
 202
 203     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 204     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 205         exit_program(1);
 206     fg->inputs[0]->ist   = ist;
 207     fg->inputs[0]->graph = fg;
 208
 209     GROW_ARRAY(ist->filters, ist->nb_filters);
 210     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 211
 212     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 213     filtergraphs[nb_filtergraphs - 1] = fg;
 214
 215     return fg;
 216 }
 217
 218 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 219 {
 220     InputStream *ist = NULL;
 221     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 222     int i;
 223
 224     // TODO: support other filter types
 225     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 226         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 227                "currently.\n");
 228         exit_program(1);
 229     }
 230
 231     if (in->name) {
 232         AVFormatContext *s;
 233         AVStream       *st = NULL;
 234         char *p;
 235         int file_idx = strtol(in->name, &p, 0);
 236
 237         if (file_idx < 0 || file_idx >= nb_input_files) {
 238             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 239                    file_idx, fg->graph_desc);
 240             exit_program(1);
 241         }
 242         s = input_files[file_idx]->ctx;
 243
 244         for (i = 0; i < s->nb_streams; i++) {
 245             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 246             if (stream_type != type &&
 247                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 248                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 249                 continue;
 250             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 251                 st = s->streams[i];
 252                 break;
 253             }
 254         }
 255         if (!st) {
 256             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 257                    "matches no streams.\n", p, fg->graph_desc);
 258             exit_program(1);
 259         }
 260         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 261     } else {
 262         /* find the first unused stream of corresponding type */
 263         for (i = 0; i < nb_input_streams; i++) {
 264             ist = input_streams[i];
 265             if (ist->st->codec->codec_type == type && ist->discard)
 266                 break;
 267         }
 268         if (i == nb_input_streams) {
 269             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 270                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 271                    in->filter_ctx->name);
 272             exit_program(1);
 273         }
 274     }
 275     av_assert0(ist);
 276
 277     ist->discard         = 0;
 278     ist->decoding_needed++;
 279     ist->st->discard = AVDISCARD_NONE;
 280
 281     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 282     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 283         exit_program(1);
 284     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 285     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 286
 287     GROW_ARRAY(ist->filters, ist->nb_filters);
 288     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 289 }
 290
 291 static int insert_trim(int64_t start_time, int64_t duration,
 292                        AVFilterContext **last_filter, int *pad_idx,
 293                        const char *filter_name)
 294 {
 295     AVFilterGraph *graph = (*last_filter)->graph;
 296     AVFilterContext *ctx;
 297     const AVFilter *trim;
 298     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 299     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 300     int ret = 0;
 301
 302     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 303         return 0;
 304
 305     trim = avfilter_get_by_name(name);
 306     if (!trim) {
 307         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 308                "recording time.\n", name);
 309         return AVERROR_FILTER_NOT_FOUND;
 310     }
 311
 312     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 313     if (!ctx)
 314         return AVERROR(ENOMEM);
 315
 316     if (duration != INT64_MAX) {
 317         ret = av_opt_set_int(ctx, "durationi", duration,
 318                                 AV_OPT_SEARCH_CHILDREN);
 319     }
 320     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 321         ret = av_opt_set_int(ctx, "starti", start_time,
 322                                 AV_OPT_SEARCH_CHILDREN);
 323     }
 324     if (ret < 0) {
 325         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 326         return ret;
 327     }
 328
 329     ret = avfilter_init_str(ctx, NULL);
 330     if (ret < 0)
 331         return ret;
 332
 333     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 334     if (ret < 0)
 335         return ret;
 336
 337     *last_filter = ctx;
 338     *pad_idx     = 0;
 339     return 0;
 340 }
 341
 342 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 343 {
 344     char *pix_fmts;
 345     OutputStream *ost = ofilter->ost;
 346     OutputFile    *of = output_files[ost->file_index];
 347     AVCodecContext *codec = ost->st->codec;
 348     AVFilterContext *last_filter = out->filter_ctx;
 349     int pad_idx = out->pad_idx;
 350     int ret;
 351     char name[255];
 352
 353     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 354     ret = avfilter_graph_create_filter(&ofilter->filter,
 355                                        avfilter_get_by_name("buffersink"),
 356                                        name, NULL, NULL, fg->graph);
 357
 358     if (ret < 0)
 359         return ret;
 360
 361     if (codec->width || codec->height) {
 362         char args[255];
 363         AVFilterContext *filter;
 364
 365         snprintf(args, sizeof(args), "%d:%d:0x%X",
 366                  codec->width,
 367                  codec->height,
 368                  (unsigned)ost->sws_flags);
 369         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 370                  ost->file_index, ost->index);
 371         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 372                                                 name, args, NULL, fg->graph)) < 0)
 373             return ret;
 374         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 375             return ret;
 376
 377         last_filter = filter;
 378         pad_idx = 0;
 379     }
 380
 381     if ((pix_fmts = choose_pix_fmts(ost))) {
 382         AVFilterContext *filter;
 383         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 384                  ost->file_index, ost->index);
 385         ret = avfilter_graph_create_filter(&filter,
 386                                                 avfilter_get_by_name("format"),
 387                                                 "format", pix_fmts, NULL,
 388                                                 fg->graph);
 389         av_freep(&pix_fmts);
 390         if (ret < 0)
 391             return ret;
 392         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 393             return ret;
 394
 395         last_filter = filter;
 396         pad_idx     = 0;
 397     }
 398
 399     if (ost->frame_rate.num && 0) {
 400         AVFilterContext *fps;
 401         char args[255];
 402
 403         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 404                  ost->frame_rate.den);
 405         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 406                  ost->file_index, ost->index);
 407         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 408                                            name, args, NULL, fg->graph);
 409         if (ret < 0)
 410             return ret;
 411
 412         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 413         if (ret < 0)
 414             return ret;
 415         last_filter = fps;
 416         pad_idx = 0;
 417     }
 418
 419     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 420              ost->file_index, ost->index);
 421     ret = insert_trim(of->start_time, of->recording_time,
 422                       &last_filter, &pad_idx, name);
 423     if (ret < 0)
 424         return ret;
 425
 426
 427     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 428         return ret;
 429
 430     return 0;
 431 }
 432
 433 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 434 {
 435     OutputStream *ost = ofilter->ost;
 436     OutputFile    *of = output_files[ost->file_index];
 437     AVCodecContext *codec  = ost->st->codec;
 438     AVFilterContext *last_filter = out->filter_ctx;
 439     int pad_idx = out->pad_idx;
 440     char *sample_fmts, *sample_rates, *channel_layouts;
 441     char name[255];
 442     int ret;
 443
 444     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 445     ret = avfilter_graph_create_filter(&ofilter->filter,
 446                                        avfilter_get_by_name("abuffersink"),
 447                                        name, NULL, NULL, fg->graph);
 448     if (ret < 0)
 449         return ret;
 450     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 451         return ret;
 452
 453 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 454     AVFilterContext *filt_ctx;                                              \
 455                                                                             \
 456     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 457            "similarly to -af " filter_name "=%s.\n", arg);                  \
 458                                                                             \
 459     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 460                                        avfilter_get_by_name(filter_name),   \
 461                                        filter_name, arg, NULL, fg->graph);  \
 462     if (ret < 0)                                                            \
 463         return ret;                                                         \
 464                                                                             \
 465     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 466     if (ret < 0)                                                            \
 467         return ret;                                                         \
 468                                                                             \
 469     last_filter = filt_ctx;                                                 \
 470     pad_idx = 0;                                                            \
 471 } while (0)
 472     if (ost->audio_channels_mapped) {
 473         int i;
 474         AVBPrint pan_buf;
 475         av_bprint_init(&pan_buf, 256, 8192);
 476         av_bprintf(&pan_buf, "0x%"PRIx64,
 477                    av_get_default_channel_layout(ost->audio_channels_mapped));
 478         for (i = 0; i < ost->audio_channels_mapped; i++)
 479             if (ost->audio_channels_map[i] != -1)
 480                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 481
 482         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 483         av_bprint_finalize(&pan_buf, NULL);
 484     }
 485
 486     if (codec->channels && !codec->channel_layout)
 487         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 488
 489     sample_fmts     = choose_sample_fmts(ost);
 490     sample_rates    = choose_sample_rates(ost);
 491     channel_layouts = choose_channel_layouts(ost);
 492     if (sample_fmts || sample_rates || channel_layouts) {
 493         AVFilterContext *format;
 494         char args[256];
 495         args[0] = 0;
 496
 497         if (sample_fmts)
 498             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 499                             sample_fmts);
 500         if (sample_rates)
 501             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 502                             sample_rates);
 503         if (channel_layouts)
 504             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 505                             channel_layouts);
 506
 507         av_freep(&sample_fmts);
 508         av_freep(&sample_rates);
 509         av_freep(&channel_layouts);
 510
 511         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 512                  ost->file_index, ost->index);
 513         ret = avfilter_graph_create_filter(&format,
 514                                            avfilter_get_by_name("aformat"),
 515                                            name, args, NULL, fg->graph);
 516         if (ret < 0)
 517             return ret;
 518
 519         ret = avfilter_link(last_filter, pad_idx, format, 0);
 520         if (ret < 0)
 521             return ret;
 522
 523         last_filter = format;
 524         pad_idx = 0;
 525     }
 526
 527     if (audio_volume != 256 && 0) {
 528         char args[256];
 529
 530         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 531         AUTO_INSERT_FILTER("-vol", "volume", args);
 532     }
 533
 534     if (ost->apad && of->shortest) {
 535         char args[256];
 536         int i;
 537
 538         for (i=0; i<of->ctx->nb_streams; i++)
 539             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 540                 break;
 541
 542         if (i<of->ctx->nb_streams) {
 543             snprintf(args, sizeof(args), "%s", ost->apad);
 544             AUTO_INSERT_FILTER("-apad", "apad", args);
 545         }
 546     }
 547
 548     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 549              ost->file_index, ost->index);
 550     ret = insert_trim(of->start_time, of->recording_time,
 551                       &last_filter, &pad_idx, name);
 552     if (ret < 0)
 553         return ret;
 554
 555     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 556         return ret;
 557
 558     return 0;
 559 }
 560
 561 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 562 {                                                                  \
 563     AVFilterContext *ctx = inout->filter_ctx;                      \
 564     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 565     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 566     AVIOContext *pb;                                               \
 567                                                                    \
 568     if (avio_open_dyn_buf(&pb) < 0)                                \
 569         exit_program(1);                                           \
 570                                                                    \
 571     avio_printf(pb, "%s", ctx->filter->name);                      \
 572     if (nb_pads > 1)                                               \
 573         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 574     avio_w8(pb, 0);                                                \
 575     avio_close_dyn_buf(pb, &f->name);                              \
 576 }
 577
 578 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 579 {
 580     av_freep(&ofilter->name);
 581     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 582
 583     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 584     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 585     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 586     default: av_assert0(0);
 587     }
 588 }
 589
 590 static int sub2video_prepare(InputStream *ist)
 591 {
 592     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 593     int i, w, h;
 594
 595     /* Compute the size of the canvas for the subtitles stream.
 596        If the subtitles codec has set a size, use it. Otherwise use the
 597        maximum dimensions of the video streams in the same file. */
 598     w = ist->st->codec->width;
 599     h = ist->st->codec->height;
 600     if (!(w && h)) {
 601         for (i = 0; i < avf->nb_streams; i++) {
 602             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 603                 w = FFMAX(w, avf->streams[i]->codec->width);
 604                 h = FFMAX(h, avf->streams[i]->codec->height);
 605             }
 606         }
 607         if (!(w && h)) {
 608             w = FFMAX(w, 720);
 609             h = FFMAX(h, 576);
 610         }
 611         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 612     }
 613     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
 614     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
 615
 616     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 617        palettes for all rectangles are identical or compatible */
 618     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 619
 620     ist->sub2video.frame = av_frame_alloc();
 621     if (!ist->sub2video.frame)
 622         return AVERROR(ENOMEM);
 623     return 0;
 624 }
 625
 626 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 627                                         AVFilterInOut *in)
 628 {
 629     AVFilterContext *last_filter;
 630     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 631     InputStream *ist = ifilter->ist;
 632     InputFile     *f = input_files[ist->file_index];
 633     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 634                                          ist->st->time_base;
 635     AVRational fr = ist->framerate;
 636     AVRational sar;
 637     AVBPrint args;
 638     char name[255];
 639     int ret, pad_idx = 0;
 640
 641     if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 642         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 643         return AVERROR(EINVAL);
 644     }
 645
 646     if (!fr.num)
 647         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 648
 649     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 650         ret = sub2video_prepare(ist);
 651         if (ret < 0)
 652             return ret;
 653     }
 654
 655     sar = ist->st->sample_aspect_ratio.num ?
 656           ist->st->sample_aspect_ratio :
 657           ist->st->codec->sample_aspect_ratio;
 658     if(!sar.den)
 659         sar = (AVRational){0,1};
 660     av_bprint_init(&args, 0, 1);
 661     av_bprintf(&args,
 662              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 663              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 664              ist->resample_height,
 665              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
 666              tb.num, tb.den, sar.num, sar.den,
 667              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 668     if (fr.num && fr.den)
 669         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 670     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 671              ist->file_index, ist->st->index);
 672
 673     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 674                                             args.str, NULL, fg->graph)) < 0)
 675         return ret;
 676     last_filter = ifilter->filter;
 677
 678     if (ist->framerate.num) {
 679         AVFilterContext *setpts;
 680
 681         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 682                  ist->file_index, ist->st->index);
 683         if ((ret = avfilter_graph_create_filter(&setpts,
 684                                                 avfilter_get_by_name("setpts"),
 685                                                 name, "N", NULL,
 686                                                 fg->graph)) < 0)
 687             return ret;
 688
 689         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 690             return ret;
 691
 692         last_filter = setpts;
 693     }
 694
 695     if (do_deinterlace) {
 696         AVFilterContext *yadif;
 697
 698         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 699                  ist->file_index, ist->st->index);
 700         if ((ret = avfilter_graph_create_filter(&yadif,
 701                                                 avfilter_get_by_name("yadif"),
 702                                                 name, "", NULL,
 703                                                 fg->graph)) < 0)
 704             return ret;
 705
 706         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 707             return ret;
 708
 709         last_filter = yadif;
 710     }
 711
 712     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 713              ist->file_index, ist->st->index);
 714     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 715                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 716     if (ret < 0)
 717         return ret;
 718
 719     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 720         return ret;
 721     return 0;
 722 }
 723
 724 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 725                                         AVFilterInOut *in)
 726 {
 727     AVFilterContext *last_filter;
 728     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 729     InputStream *ist = ifilter->ist;
 730     InputFile     *f = input_files[ist->file_index];
 731     AVBPrint args;
 732     char name[255];
 733     int ret, pad_idx = 0;
 734
 735     if (ist->st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
 736         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 737         return AVERROR(EINVAL);
 738     }
 739
 740     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 741     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 742              1, ist->st->codec->sample_rate,
 743              ist->st->codec->sample_rate,
 744              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 745     if (ist->st->codec->channel_layout)
 746         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 747                    ist->st->codec->channel_layout);
 748     else
 749         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 750     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 751              ist->file_index, ist->st->index);
 752
 753     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 754                                             name, args.str, NULL,
 755                                             fg->graph)) < 0)
 756         return ret;
 757     last_filter = ifilter->filter;
 758
 759 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 760     AVFilterContext *filt_ctx;                                              \
 761                                                                             \
 762     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 763            "similarly to -af " filter_name "=%s.\n", arg);                  \
 764                                                                             \
 765     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 766                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 767     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 768                                        avfilter_get_by_name(filter_name),   \
 769                                        name, arg, NULL, fg->graph);         \
 770     if (ret < 0)                                                            \
 771         return ret;                                                         \
 772                                                                             \
 773     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 774     if (ret < 0)                                                            \
 775         return ret;                                                         \
 776                                                                             \
 777     last_filter = filt_ctx;                                                 \
 778 } while (0)
 779
 780     if (audio_sync_method > 0) {
 781         char args[256] = {0};
 782
 783         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 784         if (audio_drift_threshold != 0.1)
 785             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 786         if (!fg->reconfiguration)
 787             av_strlcatf(args, sizeof(args), ":first_pts=0");
 788         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 789     }
 790
 791 //     if (ost->audio_channels_mapped) {
 792 //         int i;
 793 //         AVBPrint pan_buf;
 794 //         av_bprint_init(&pan_buf, 256, 8192);
 795 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 796 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 797 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 798 //             if (ost->audio_channels_map[i] != -1)
 799 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 800 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 801 //         av_bprint_finalize(&pan_buf, NULL);
 802 //     }
 803
 804     if (audio_volume != 256) {
 805         char args[256];
 806
 807         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 808                "audio filter instead.\n");
 809
 810         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 811         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 812     }
 813
 814     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 815              ist->file_index, ist->st->index);
 816     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 817                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 818     if (ret < 0)
 819         return ret;
 820
 821     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 822         return ret;
 823
 824     return 0;
 825 }
 826
 827 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 828                                   AVFilterInOut *in)
 829 {
 830     av_freep(&ifilter->name);
 831     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 832
 833     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 834     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 835     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 836     default: av_assert0(0);
 837     }
 838 }
 839
 840 int configure_filtergraph(FilterGraph *fg)
 841 {
 842     AVFilterInOut *inputs, *outputs, *cur;
 843     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 844     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 845                                       fg->graph_desc;
 846
 847     avfilter_graph_free(&fg->graph);
 848     if (!(fg->graph = avfilter_graph_alloc()))
 849         return AVERROR(ENOMEM);
 850
 851     if (simple) {
 852         OutputStream *ost = fg->outputs[0]->ost;
 853         char args[512];
 854         AVDictionaryEntry *e = NULL;
 855
 856         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 857         fg->graph->scale_sws_opts = av_strdup(args);
 858
 859         args[0] = 0;
 860         while ((e = av_dict_get(ost->swr_opts, "", e,
 861                                 AV_DICT_IGNORE_SUFFIX))) {
 862             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 863         }
 864         if (strlen(args))
 865             args[strlen(args)-1] = 0;
 866         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 867
 868         args[0] = '\0';
 869         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 870                                 AV_DICT_IGNORE_SUFFIX))) {
 871             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 872         }
 873         if (strlen(args))
 874             args[strlen(args) - 1] = '\0';
 875         fg->graph->resample_lavr_opts = av_strdup(args);
 876
 877         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
 878         if (e)
 879             av_opt_set(fg->graph, "threads", e->value, 0);
 880     }
 881
 882     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 883         return ret;
 884
 885     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 886         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 887                "exactly one input and output.\n", graph_desc);
 888         return AVERROR(EINVAL);
 889     }
 890
 891     for (cur = inputs; !simple && init && cur; cur = cur->next)
 892         init_input_filter(fg, cur);
 893
 894     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 895         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 896             return ret;
 897     avfilter_inout_free(&inputs);
 898
 899     if (!init || simple) {
 900         /* we already know the mappings between lavfi outputs and output streams,
 901          * so we can finish the setup */
 902         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 903             configure_output_filter(fg, fg->outputs[i], cur);
 904         avfilter_inout_free(&outputs);
 905
 906         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 907             return ret;
 908     } else {
 909         /* wait until output mappings are processed */
 910         for (cur = outputs; cur;) {
 911             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 912             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 913                 exit_program(1);
 914             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 915             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 916             cur = cur->next;
 917             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 918         }
 919     }
 920
 921     fg->reconfiguration = 1;
 922     return 0;
 923 }
 924
 925 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 926 {
 927     int i;
 928     for (i = 0; i < fg->nb_inputs; i++)
 929         if (fg->inputs[i]->ist == ist)
 930             return 1;
 931     return 0;
 932 }
 933