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