git.sesse.net Git - ffmpeg/blob - ffmpeg_filter.c

   1 /*
   2  * ffmpeg filter configuration
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <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/display.h"
  35 #include "libavutil/opt.h"
  36 #include "libavutil/pixdesc.h"
  37 #include "libavutil/pixfmt.h"
  38 #include "libavutil/imgutils.h"
  39 #include "libavutil/samplefmt.h"
  40
  41 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx, AVCodec *codec, enum AVPixelFormat target)
  42 {
  43     if (codec && codec->pix_fmts) {
  44         const enum AVPixelFormat *p = codec->pix_fmts;
  45         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  46         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  47         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  48         static const enum AVPixelFormat mjpeg_formats[] =
  49             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  50         static const enum AVPixelFormat ljpeg_formats[] =
  51             { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  52               AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  53
  54         if (enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  55             if (enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
  56                 p = mjpeg_formats;
  57             } else if (enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
  58                 p =ljpeg_formats;
  59             }
  60         }
  61         for (; *p != AV_PIX_FMT_NONE; p++) {
  62             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  63             if (*p == target)
  64                 break;
  65         }
  66         if (*p == AV_PIX_FMT_NONE) {
  67             if (target != AV_PIX_FMT_NONE)
  68                 av_log(NULL, AV_LOG_WARNING,
  69                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  70                        av_get_pix_fmt_name(target),
  71                        codec->name,
  72                        av_get_pix_fmt_name(best));
  73             return best;
  74         }
  75     }
  76     return target;
  77 }
  78
  79 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  80 {
  81     if (codec && codec->sample_fmts) {
  82         const enum AVSampleFormat *p = codec->sample_fmts;
  83         for (; *p != -1; p++) {
  84             if (*p == st->codec->sample_fmt)
  85                 break;
  86         }
  87         if (*p == -1) {
  88             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  89                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  90             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  91             av_log(NULL, AV_LOG_WARNING,
  92                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  93                    av_get_sample_fmt_name(st->codec->sample_fmt),
  94                    codec->name,
  95                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  96             st->codec->sample_fmt = codec->sample_fmts[0];
  97         }
  98     }
  99 }
 100
 101 static char *choose_pix_fmts(OutputStream *ost)
 102 {
 103     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
 104     if (strict_dict)
 105         // used by choose_pixel_fmt() and below
 106         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
 107
 108      if (ost->keep_pix_fmt) {
 109         if (ost->filter)
 110             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
 111                                             AVFILTER_AUTO_CONVERT_NONE);
 112         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
 113             return NULL;
 114         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
 115     }
 116     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
 117         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
 118     } else if (ost->enc && ost->enc->pix_fmts) {
 119         const enum AVPixelFormat *p;
 120         AVIOContext *s = NULL;
 121         uint8_t *ret;
 122         int len;
 123
 124         if (avio_open_dyn_buf(&s) < 0)
 125             exit_program(1);
 126
 127         p = ost->enc->pix_fmts;
 128         if (ost->enc_ctx->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 129             if (ost->enc_ctx->codec_id == AV_CODEC_ID_MJPEG) {
 130                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 131             } else if (ost->enc_ctx->codec_id == AV_CODEC_ID_LJPEG) {
 132                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 133                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 134             }
 135         }
 136
 137         for (; *p != AV_PIX_FMT_NONE; p++) {
 138             const char *name = av_get_pix_fmt_name(*p);
 139             avio_printf(s, "%s|", name);
 140         }
 141         len = avio_close_dyn_buf(s, &ret);
 142         ret[len - 1] = 0;
 143         return ret;
 144     } else
 145         return NULL;
 146 }
 147
 148 /* Define a function for building a string containing a list of
 149  * allowed formats. */
 150 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 151 static char *choose_ ## var ## s(OutputStream *ost)                            \
 152 {                                                                              \
 153     if (ost->enc_ctx->var != none) {                                           \
 154         get_name(ost->enc_ctx->var);                                           \
 155         return av_strdup(name);                                                \
 156     } else if (ost->enc && ost->enc->supported_list) {                         \
 157         const type *p;                                                         \
 158         AVIOContext *s = NULL;                                                 \
 159         uint8_t *ret;                                                          \
 160         int len;                                                               \
 161                                                                                \
 162         if (avio_open_dyn_buf(&s) < 0)                                         \
 163             exit_program(1);                                                           \
 164                                                                                \
 165         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 166             get_name(*p);                                                      \
 167             avio_printf(s, "%s|", name);                                       \
 168         }                                                                      \
 169         len = avio_close_dyn_buf(s, &ret);                                     \
 170         ret[len - 1] = 0;                                                      \
 171         return ret;                                                            \
 172     } else                                                                     \
 173         return NULL;                                                           \
 174 }
 175
 176 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 177 //                   GET_PIX_FMT_NAME)
 178
 179 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 180                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 181
 182 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 183                   GET_SAMPLE_RATE_NAME)
 184
 185 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 186                   GET_CH_LAYOUT_NAME)
 187
 188 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 189 {
 190     FilterGraph *fg = av_mallocz(sizeof(*fg));
 191
 192     if (!fg)
 193         exit_program(1);
 194     fg->index = nb_filtergraphs;
 195
 196     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 197     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 198         exit_program(1);
 199     fg->outputs[0]->ost   = ost;
 200     fg->outputs[0]->graph = fg;
 201
 202     ost->filter = fg->outputs[0];
 203
 204     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 205     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 206         exit_program(1);
 207     fg->inputs[0]->ist   = ist;
 208     fg->inputs[0]->graph = fg;
 209
 210     GROW_ARRAY(ist->filters, ist->nb_filters);
 211     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 212
 213     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 214     filtergraphs[nb_filtergraphs - 1] = fg;
 215
 216     return fg;
 217 }
 218
 219 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 220 {
 221     InputStream *ist = NULL;
 222     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 223     int i;
 224
 225     // TODO: support other filter types
 226     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 227         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 228                "currently.\n");
 229         exit_program(1);
 230     }
 231
 232     if (in->name) {
 233         AVFormatContext *s;
 234         AVStream       *st = NULL;
 235         char *p;
 236         int file_idx = strtol(in->name, &p, 0);
 237
 238         if (file_idx < 0 || file_idx >= nb_input_files) {
 239             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 240                    file_idx, fg->graph_desc);
 241             exit_program(1);
 242         }
 243         s = input_files[file_idx]->ctx;
 244
 245         for (i = 0; i < s->nb_streams; i++) {
 246             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 247             if (stream_type != type &&
 248                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 249                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 250                 continue;
 251             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 252                 st = s->streams[i];
 253                 break;
 254             }
 255         }
 256         if (!st) {
 257             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 258                    "matches no streams.\n", p, fg->graph_desc);
 259             exit_program(1);
 260         }
 261         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 262     } else {
 263         /* find the first unused stream of corresponding type */
 264         for (i = 0; i < nb_input_streams; i++) {
 265             ist = input_streams[i];
 266             if (ist->dec_ctx->codec_type == type && ist->discard)
 267                 break;
 268         }
 269         if (i == nb_input_streams) {
 270             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 271                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 272                    in->filter_ctx->name);
 273             exit_program(1);
 274         }
 275     }
 276     av_assert0(ist);
 277
 278     ist->discard         = 0;
 279     ist->decoding_needed |= DECODING_FOR_FILTER;
 280     ist->st->discard = AVDISCARD_NONE;
 281
 282     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 283     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 284         exit_program(1);
 285     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 286     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 287
 288     GROW_ARRAY(ist->filters, ist->nb_filters);
 289     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 290 }
 291
 292 static int insert_trim(int64_t start_time, int64_t duration,
 293                        AVFilterContext **last_filter, int *pad_idx,
 294                        const char *filter_name)
 295 {
 296     AVFilterGraph *graph = (*last_filter)->graph;
 297     AVFilterContext *ctx;
 298     const AVFilter *trim;
 299     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 300     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 301     int ret = 0;
 302
 303     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 304         return 0;
 305
 306     trim = avfilter_get_by_name(name);
 307     if (!trim) {
 308         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 309                "recording time.\n", name);
 310         return AVERROR_FILTER_NOT_FOUND;
 311     }
 312
 313     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 314     if (!ctx)
 315         return AVERROR(ENOMEM);
 316
 317     if (duration != INT64_MAX) {
 318         ret = av_opt_set_int(ctx, "durationi", duration,
 319                                 AV_OPT_SEARCH_CHILDREN);
 320     }
 321     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 322         ret = av_opt_set_int(ctx, "starti", start_time,
 323                                 AV_OPT_SEARCH_CHILDREN);
 324     }
 325     if (ret < 0) {
 326         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 327         return ret;
 328     }
 329
 330     ret = avfilter_init_str(ctx, NULL);
 331     if (ret < 0)
 332         return ret;
 333
 334     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 335     if (ret < 0)
 336         return ret;
 337
 338     *last_filter = ctx;
 339     *pad_idx     = 0;
 340     return 0;
 341 }
 342
 343 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 344                          const char *filter_name, const char *args)
 345 {
 346     AVFilterGraph *graph = (*last_filter)->graph;
 347     AVFilterContext *ctx;
 348     int ret;
 349
 350     ret = avfilter_graph_create_filter(&ctx,
 351                                        avfilter_get_by_name(filter_name),
 352                                        filter_name, args, NULL, graph);
 353     if (ret < 0)
 354         return ret;
 355
 356     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 357     if (ret < 0)
 358         return ret;
 359
 360     *last_filter = ctx;
 361     *pad_idx     = 0;
 362     return 0;
 363 }
 364
 365 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 366 {
 367     char *pix_fmts;
 368     OutputStream *ost = ofilter->ost;
 369     OutputFile    *of = output_files[ost->file_index];
 370     AVCodecContext *codec = ost->enc_ctx;
 371     AVFilterContext *last_filter = out->filter_ctx;
 372     int pad_idx = out->pad_idx;
 373     int ret;
 374     char name[255];
 375
 376     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 377     ret = avfilter_graph_create_filter(&ofilter->filter,
 378                                        avfilter_get_by_name("buffersink"),
 379                                        name, NULL, NULL, fg->graph);
 380
 381     if (ret < 0)
 382         return ret;
 383
 384     if (codec->width || codec->height) {
 385         char args[255];
 386         AVFilterContext *filter;
 387
 388         snprintf(args, sizeof(args), "%d:%d:0x%X",
 389                  codec->width,
 390                  codec->height,
 391                  (unsigned)ost->sws_flags);
 392         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 393                  ost->file_index, ost->index);
 394         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 395                                                 name, args, NULL, fg->graph)) < 0)
 396             return ret;
 397         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 398             return ret;
 399
 400         last_filter = filter;
 401         pad_idx = 0;
 402     }
 403
 404     if ((pix_fmts = choose_pix_fmts(ost))) {
 405         AVFilterContext *filter;
 406         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 407                  ost->file_index, ost->index);
 408         ret = avfilter_graph_create_filter(&filter,
 409                                            avfilter_get_by_name("format"),
 410                                            "format", pix_fmts, NULL, fg->graph);
 411         av_freep(&pix_fmts);
 412         if (ret < 0)
 413             return ret;
 414         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 415             return ret;
 416
 417         last_filter = filter;
 418         pad_idx     = 0;
 419     }
 420
 421     if (ost->frame_rate.num && 0) {
 422         AVFilterContext *fps;
 423         char args[255];
 424
 425         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 426                  ost->frame_rate.den);
 427         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 428                  ost->file_index, ost->index);
 429         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 430                                            name, args, NULL, fg->graph);
 431         if (ret < 0)
 432             return ret;
 433
 434         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 435         if (ret < 0)
 436             return ret;
 437         last_filter = fps;
 438         pad_idx = 0;
 439     }
 440
 441     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 442              ost->file_index, ost->index);
 443     ret = insert_trim(of->start_time, of->recording_time,
 444                       &last_filter, &pad_idx, name);
 445     if (ret < 0)
 446         return ret;
 447
 448
 449     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 450         return ret;
 451
 452     return 0;
 453 }
 454
 455 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 456 {
 457     OutputStream *ost = ofilter->ost;
 458     OutputFile    *of = output_files[ost->file_index];
 459     AVCodecContext *codec  = ost->enc_ctx;
 460     AVFilterContext *last_filter = out->filter_ctx;
 461     int pad_idx = out->pad_idx;
 462     char *sample_fmts, *sample_rates, *channel_layouts;
 463     char name[255];
 464     int ret;
 465
 466     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 467     ret = avfilter_graph_create_filter(&ofilter->filter,
 468                                        avfilter_get_by_name("abuffersink"),
 469                                        name, NULL, NULL, fg->graph);
 470     if (ret < 0)
 471         return ret;
 472     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 473         return ret;
 474
 475 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 476     AVFilterContext *filt_ctx;                                              \
 477                                                                             \
 478     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 479            "similarly to -af " filter_name "=%s.\n", arg);                  \
 480                                                                             \
 481     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 482                                        avfilter_get_by_name(filter_name),   \
 483                                        filter_name, arg, NULL, fg->graph);  \
 484     if (ret < 0)                                                            \
 485         return ret;                                                         \
 486                                                                             \
 487     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 488     if (ret < 0)                                                            \
 489         return ret;                                                         \
 490                                                                             \
 491     last_filter = filt_ctx;                                                 \
 492     pad_idx = 0;                                                            \
 493 } while (0)
 494     if (ost->audio_channels_mapped) {
 495         int i;
 496         AVBPrint pan_buf;
 497         av_bprint_init(&pan_buf, 256, 8192);
 498         av_bprintf(&pan_buf, "0x%"PRIx64,
 499                    av_get_default_channel_layout(ost->audio_channels_mapped));
 500         for (i = 0; i < ost->audio_channels_mapped; i++)
 501             if (ost->audio_channels_map[i] != -1)
 502                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 503
 504         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 505         av_bprint_finalize(&pan_buf, NULL);
 506     }
 507
 508     if (codec->channels && !codec->channel_layout)
 509         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 510
 511     sample_fmts     = choose_sample_fmts(ost);
 512     sample_rates    = choose_sample_rates(ost);
 513     channel_layouts = choose_channel_layouts(ost);
 514     if (sample_fmts || sample_rates || channel_layouts) {
 515         AVFilterContext *format;
 516         char args[256];
 517         args[0] = 0;
 518
 519         if (sample_fmts)
 520             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 521                             sample_fmts);
 522         if (sample_rates)
 523             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 524                             sample_rates);
 525         if (channel_layouts)
 526             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 527                             channel_layouts);
 528
 529         av_freep(&sample_fmts);
 530         av_freep(&sample_rates);
 531         av_freep(&channel_layouts);
 532
 533         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 534                  ost->file_index, ost->index);
 535         ret = avfilter_graph_create_filter(&format,
 536                                            avfilter_get_by_name("aformat"),
 537                                            name, args, NULL, fg->graph);
 538         if (ret < 0)
 539             return ret;
 540
 541         ret = avfilter_link(last_filter, pad_idx, format, 0);
 542         if (ret < 0)
 543             return ret;
 544
 545         last_filter = format;
 546         pad_idx = 0;
 547     }
 548
 549     if (audio_volume != 256 && 0) {
 550         char args[256];
 551
 552         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 553         AUTO_INSERT_FILTER("-vol", "volume", args);
 554     }
 555
 556     if (ost->apad && of->shortest) {
 557         char args[256];
 558         int i;
 559
 560         for (i=0; i<of->ctx->nb_streams; i++)
 561             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 562                 break;
 563
 564         if (i<of->ctx->nb_streams) {
 565             snprintf(args, sizeof(args), "%s", ost->apad);
 566             AUTO_INSERT_FILTER("-apad", "apad", args);
 567         }
 568     }
 569
 570     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 571              ost->file_index, ost->index);
 572     ret = insert_trim(of->start_time, of->recording_time,
 573                       &last_filter, &pad_idx, name);
 574     if (ret < 0)
 575         return ret;
 576
 577     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 578         return ret;
 579
 580     return 0;
 581 }
 582
 583 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 584 {                                                                  \
 585     AVFilterContext *ctx = inout->filter_ctx;                      \
 586     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 587     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 588     AVIOContext *pb;                                               \
 589                                                                    \
 590     if (avio_open_dyn_buf(&pb) < 0)                                \
 591         exit_program(1);                                           \
 592                                                                    \
 593     avio_printf(pb, "%s", ctx->filter->name);                      \
 594     if (nb_pads > 1)                                               \
 595         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 596     avio_w8(pb, 0);                                                \
 597     avio_close_dyn_buf(pb, &f->name);                              \
 598 }
 599
 600 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 601 {
 602     av_freep(&ofilter->name);
 603     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 604
 605     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 606     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 607     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 608     default: av_assert0(0);
 609     }
 610 }
 611
 612 static int sub2video_prepare(InputStream *ist)
 613 {
 614     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 615     int i, w, h;
 616
 617     /* Compute the size of the canvas for the subtitles stream.
 618        If the subtitles codec has set a size, use it. Otherwise use the
 619        maximum dimensions of the video streams in the same file. */
 620     w = ist->dec_ctx->width;
 621     h = ist->dec_ctx->height;
 622     if (!(w && h)) {
 623         for (i = 0; i < avf->nb_streams; i++) {
 624             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 625                 w = FFMAX(w, avf->streams[i]->codec->width);
 626                 h = FFMAX(h, avf->streams[i]->codec->height);
 627             }
 628         }
 629         if (!(w && h)) {
 630             w = FFMAX(w, 720);
 631             h = FFMAX(h, 576);
 632         }
 633         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 634     }
 635     ist->sub2video.w = ist->dec_ctx->width  = ist->resample_width  = w;
 636     ist->sub2video.h = ist->dec_ctx->height = ist->resample_height = h;
 637
 638     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 639        palettes for all rectangles are identical or compatible */
 640     ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
 641
 642     ist->sub2video.frame = av_frame_alloc();
 643     if (!ist->sub2video.frame)
 644         return AVERROR(ENOMEM);
 645     ist->sub2video.last_pts = INT64_MIN;
 646     return 0;
 647 }
 648
 649 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 650                                         AVFilterInOut *in)
 651 {
 652     AVFilterContext *last_filter;
 653     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 654     InputStream *ist = ifilter->ist;
 655     InputFile     *f = input_files[ist->file_index];
 656     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 657                                          ist->st->time_base;
 658     AVRational fr = ist->framerate;
 659     AVRational sar;
 660     AVBPrint args;
 661     char name[255];
 662     int ret, pad_idx = 0;
 663     int64_t tsoffset = 0;
 664
 665     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
 666         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 667         return AVERROR(EINVAL);
 668     }
 669
 670     if (!fr.num)
 671         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 672
 673     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 674         ret = sub2video_prepare(ist);
 675         if (ret < 0)
 676             return ret;
 677     }
 678
 679     sar = ist->st->sample_aspect_ratio.num ?
 680           ist->st->sample_aspect_ratio :
 681           ist->dec_ctx->sample_aspect_ratio;
 682     if(!sar.den)
 683         sar = (AVRational){0,1};
 684     av_bprint_init(&args, 0, 1);
 685     av_bprintf(&args,
 686              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 687              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 688              ist->resample_height,
 689              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
 690              tb.num, tb.den, sar.num, sar.den,
 691              SWS_BILINEAR + ((ist->dec_ctx->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 692     if (fr.num && fr.den)
 693         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 694     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 695              ist->file_index, ist->st->index);
 696
 697     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 698                                             args.str, NULL, fg->graph)) < 0)
 699         return ret;
 700     last_filter = ifilter->filter;
 701
 702     if (ist->autorotate) {
 703         double theta = get_rotation(ist->st);
 704
 705         if (fabs(theta - 90) < 1.0) {
 706             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
 707         } else if (fabs(theta - 180) < 1.0) {
 708             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 709             if (ret < 0)
 710                 return ret;
 711             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 712         } else if (fabs(theta - 270) < 1.0) {
 713             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
 714         } else if (fabs(theta) > 1.0) {
 715             char rotate_buf[64];
 716             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
 717             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
 718         }
 719         if (ret < 0)
 720             return ret;
 721     }
 722
 723     if (ist->framerate.num) {
 724         AVFilterContext *setpts;
 725
 726         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 727                  ist->file_index, ist->st->index);
 728         if ((ret = avfilter_graph_create_filter(&setpts,
 729                                                 avfilter_get_by_name("setpts"),
 730                                                 name, "N", NULL,
 731                                                 fg->graph)) < 0)
 732             return ret;
 733
 734         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 735             return ret;
 736
 737         last_filter = setpts;
 738     }
 739
 740     if (do_deinterlace) {
 741         AVFilterContext *yadif;
 742
 743         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 744                  ist->file_index, ist->st->index);
 745         if ((ret = avfilter_graph_create_filter(&yadif,
 746                                                 avfilter_get_by_name("yadif"),
 747                                                 name, "", NULL,
 748                                                 fg->graph)) < 0)
 749             return ret;
 750
 751         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 752             return ret;
 753
 754         last_filter = yadif;
 755     }
 756
 757     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 758              ist->file_index, ist->st->index);
 759     if (copy_ts) {
 760         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 761         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 762             tsoffset += f->ctx->start_time;
 763     }
 764     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 765                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 766                       &last_filter, &pad_idx, name);
 767     if (ret < 0)
 768         return ret;
 769
 770     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 771         return ret;
 772     return 0;
 773 }
 774
 775 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 776                                         AVFilterInOut *in)
 777 {
 778     AVFilterContext *last_filter;
 779     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 780     InputStream *ist = ifilter->ist;
 781     InputFile     *f = input_files[ist->file_index];
 782     AVBPrint args;
 783     char name[255];
 784     int ret, pad_idx = 0;
 785     int64_t tsoffset = 0;
 786
 787     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
 788         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 789         return AVERROR(EINVAL);
 790     }
 791
 792     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 793     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 794              1, ist->dec_ctx->sample_rate,
 795              ist->dec_ctx->sample_rate,
 796              av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
 797     if (ist->dec_ctx->channel_layout)
 798         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 799                    ist->dec_ctx->channel_layout);
 800     else
 801         av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
 802     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 803              ist->file_index, ist->st->index);
 804
 805     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 806                                             name, args.str, NULL,
 807                                             fg->graph)) < 0)
 808         return ret;
 809     last_filter = ifilter->filter;
 810
 811 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 812     AVFilterContext *filt_ctx;                                              \
 813                                                                             \
 814     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 815            "similarly to -af " filter_name "=%s.\n", arg);                  \
 816                                                                             \
 817     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 818                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 819     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 820                                        avfilter_get_by_name(filter_name),   \
 821                                        name, arg, NULL, fg->graph);         \
 822     if (ret < 0)                                                            \
 823         return ret;                                                         \
 824                                                                             \
 825     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 826     if (ret < 0)                                                            \
 827         return ret;                                                         \
 828                                                                             \
 829     last_filter = filt_ctx;                                                 \
 830 } while (0)
 831
 832     if (audio_sync_method > 0) {
 833         char args[256] = {0};
 834
 835         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 836         if (audio_drift_threshold != 0.1)
 837             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 838         if (!fg->reconfiguration)
 839             av_strlcatf(args, sizeof(args), ":first_pts=0");
 840         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 841     }
 842
 843 //     if (ost->audio_channels_mapped) {
 844 //         int i;
 845 //         AVBPrint pan_buf;
 846 //         av_bprint_init(&pan_buf, 256, 8192);
 847 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 848 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 849 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 850 //             if (ost->audio_channels_map[i] != -1)
 851 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 852 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 853 //         av_bprint_finalize(&pan_buf, NULL);
 854 //     }
 855
 856     if (audio_volume != 256) {
 857         char args[256];
 858
 859         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 860                "audio filter instead.\n");
 861
 862         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 863         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 864     }
 865
 866     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 867              ist->file_index, ist->st->index);
 868     if (copy_ts) {
 869         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 870         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 871             tsoffset += f->ctx->start_time;
 872     }
 873     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 874                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 875                       &last_filter, &pad_idx, name);
 876     if (ret < 0)
 877         return ret;
 878
 879     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 880         return ret;
 881
 882     return 0;
 883 }
 884
 885 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 886                                   AVFilterInOut *in)
 887 {
 888     av_freep(&ifilter->name);
 889     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 890
 891     if (!ifilter->ist->dec) {
 892         av_log(NULL, AV_LOG_ERROR,
 893                "No decoder for stream #%d:%d, filtering impossible\n",
 894                ifilter->ist->file_index, ifilter->ist->st->index);
 895         return AVERROR_DECODER_NOT_FOUND;
 896     }
 897     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 898     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 899     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 900     default: av_assert0(0);
 901     }
 902 }
 903
 904 int configure_filtergraph(FilterGraph *fg)
 905 {
 906     AVFilterInOut *inputs, *outputs, *cur;
 907     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 908     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 909                                       fg->graph_desc;
 910
 911     avfilter_graph_free(&fg->graph);
 912     if (!(fg->graph = avfilter_graph_alloc()))
 913         return AVERROR(ENOMEM);
 914
 915     if (simple) {
 916         OutputStream *ost = fg->outputs[0]->ost;
 917         char args[512];
 918         AVDictionaryEntry *e = NULL;
 919
 920         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 921         fg->graph->scale_sws_opts = av_strdup(args);
 922
 923         args[0] = 0;
 924         while ((e = av_dict_get(ost->swr_opts, "", e,
 925                                 AV_DICT_IGNORE_SUFFIX))) {
 926             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 927         }
 928         if (strlen(args))
 929             args[strlen(args)-1] = 0;
 930         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 931
 932         args[0] = '\0';
 933         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 934                                 AV_DICT_IGNORE_SUFFIX))) {
 935             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 936         }
 937         if (strlen(args))
 938             args[strlen(args) - 1] = '\0';
 939         fg->graph->resample_lavr_opts = av_strdup(args);
 940
 941         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
 942         if (e)
 943             av_opt_set(fg->graph, "threads", e->value, 0);
 944     }
 945
 946     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 947         return ret;
 948
 949     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 950         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 951                "exactly one input and output.\n", graph_desc);
 952         return AVERROR(EINVAL);
 953     }
 954
 955     for (cur = inputs; !simple && init && cur; cur = cur->next)
 956         init_input_filter(fg, cur);
 957
 958     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 959         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
 960             avfilter_inout_free(&inputs);
 961             avfilter_inout_free(&outputs);
 962             return ret;
 963         }
 964     avfilter_inout_free(&inputs);
 965
 966     if (!init || simple) {
 967         /* we already know the mappings between lavfi outputs and output streams,
 968          * so we can finish the setup */
 969         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 970             configure_output_filter(fg, fg->outputs[i], cur);
 971         avfilter_inout_free(&outputs);
 972
 973         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 974             return ret;
 975     } else {
 976         /* wait until output mappings are processed */
 977         for (cur = outputs; cur;) {
 978             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 979             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 980                 exit_program(1);
 981             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 982             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 983             cur = cur->next;
 984             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 985         }
 986     }
 987
 988     fg->reconfiguration = 1;
 989
 990     for (i = 0; i < fg->nb_outputs; i++) {
 991         OutputStream *ost = fg->outputs[i]->ost;
 992         if (ost &&
 993             ost->enc->type == AVMEDIA_TYPE_AUDIO &&
 994             !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
 995             av_buffersink_set_frame_size(ost->filter->filter,
 996                                          ost->enc_ctx->frame_size);
 997     }
 998
 999     return 0;
1000 }
1001
1002 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
1003 {
1004     int i;
1005     for (i = 0; i < fg->nb_inputs; i++)
1006         if (fg->inputs[i]->ist == ist)
1007             return 1;
1008     return 0;
1009 }
1010