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