git.sesse.net Git - ffmpeg/blob - fftools/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 #include "libavfilter/buffersrc.h"
  28
  29 #include "libavresample/avresample.h"
  30
  31 #include "libavutil/avassert.h"
  32 #include "libavutil/avstring.h"
  33 #include "libavutil/bprint.h"
  34 #include "libavutil/channel_layout.h"
  35 #include "libavutil/display.h"
  36 #include "libavutil/opt.h"
  37 #include "libavutil/pixdesc.h"
  38 #include "libavutil/pixfmt.h"
  39 #include "libavutil/imgutils.h"
  40 #include "libavutil/samplefmt.h"
  41
  42 // FIXME: YUV420P etc. are actually supported with full color range,
  43 // yet the latter information isn't available here.
  44 static const enum AVPixelFormat *get_compliance_normal_pix_fmts(enum AVCodecID codec_id, const enum AVPixelFormat default_formats[])
  45 {
  46     static const enum AVPixelFormat mjpeg_formats[] =
  47         { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P,
  48           AV_PIX_FMT_NONE };
  49
  50     if (codec_id == AV_CODEC_ID_MJPEG) {
  51         return mjpeg_formats;
  52     } else {
  53         return default_formats;
  54     }
  55 }
  56
  57 static enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodecContext *enc_ctx,
  58                                     const AVCodec *codec, enum AVPixelFormat target)
  59 {
  60     if (codec && codec->pix_fmts) {
  61         const enum AVPixelFormat *p = codec->pix_fmts;
  62         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  63         //FIXME: This should check for AV_PIX_FMT_FLAG_ALPHA after PAL8 pixel format without alpha is implemented
  64         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  65         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  66
  67         if (enc_ctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
  68             p = get_compliance_normal_pix_fmts(enc_ctx->codec_id, p);
  69         }
  70         for (; *p != AV_PIX_FMT_NONE; p++) {
  71             best = av_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  72             if (*p == target)
  73                 break;
  74         }
  75         if (*p == AV_PIX_FMT_NONE) {
  76             if (target != AV_PIX_FMT_NONE)
  77                 av_log(NULL, AV_LOG_WARNING,
  78                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  79                        av_get_pix_fmt_name(target),
  80                        codec->name,
  81                        av_get_pix_fmt_name(best));
  82             return best;
  83         }
  84     }
  85     return target;
  86 }
  87
  88 static char *choose_pix_fmts(OutputFilter *ofilter)
  89 {
  90     OutputStream *ost = ofilter->ost;
  91     AVDictionaryEntry *strict_dict = av_dict_get(ost->encoder_opts, "strict", NULL, 0);
  92     if (strict_dict)
  93         // used by choose_pixel_fmt() and below
  94         av_opt_set(ost->enc_ctx, "strict", strict_dict->value, 0);
  95
  96      if (ost->keep_pix_fmt) {
  97         avfilter_graph_set_auto_convert(ofilter->graph->graph,
  98                                             AVFILTER_AUTO_CONVERT_NONE);
  99         if (ost->enc_ctx->pix_fmt == AV_PIX_FMT_NONE)
 100             return NULL;
 101         return av_strdup(av_get_pix_fmt_name(ost->enc_ctx->pix_fmt));
 102     }
 103     if (ost->enc_ctx->pix_fmt != AV_PIX_FMT_NONE) {
 104         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc_ctx, ost->enc, ost->enc_ctx->pix_fmt)));
 105     } else if (ost->enc && ost->enc->pix_fmts) {
 106         const enum AVPixelFormat *p;
 107         AVIOContext *s = NULL;
 108         uint8_t *ret;
 109         int len;
 110
 111         if (avio_open_dyn_buf(&s) < 0)
 112             exit_program(1);
 113
 114         p = ost->enc->pix_fmts;
 115         if (ost->enc_ctx->strict_std_compliance > FF_COMPLIANCE_UNOFFICIAL) {
 116             p = get_compliance_normal_pix_fmts(ost->enc_ctx->codec_id, p);
 117         }
 118
 119         for (; *p != AV_PIX_FMT_NONE; p++) {
 120             const char *name = av_get_pix_fmt_name(*p);
 121             avio_printf(s, "%s|", name);
 122         }
 123         len = avio_close_dyn_buf(s, &ret);
 124         ret[len - 1] = 0;
 125         return ret;
 126     } else
 127         return NULL;
 128 }
 129
 130 /* Define a function for appending a list of allowed formats
 131  * to an AVBPrint. If nonempty, the list will have a header. */
 132 #define DEF_CHOOSE_FORMAT(name, type, var, supported_list, none, printf_format, get_name) \
 133 static void choose_ ## name (OutputFilter *ofilter, AVBPrint *bprint)          \
 134 {                                                                              \
 135     if (ofilter->var == none && !ofilter->supported_list)                      \
 136         return;                                                                \
 137     av_bprintf(bprint, #name "=");                                             \
 138     if (ofilter->var != none) {                                                \
 139         av_bprintf(bprint, printf_format, get_name(ofilter->var));             \
 140     } else {                                                                   \
 141         const type *p;                                                         \
 142                                                                                \
 143         for (p = ofilter->supported_list; *p != none; p++) {                   \
 144             av_bprintf(bprint, printf_format "|", get_name(*p));               \
 145         }                                                                      \
 146         if (bprint->len > 0)                                                   \
 147             bprint->str[--bprint->len] = '\0';                                 \
 148     }                                                                          \
 149     av_bprint_chars(bprint, ':', 1);                                           \
 150 }
 151
 152 //DEF_CHOOSE_FORMAT(pix_fmts, enum AVPixelFormat, format, formats, AV_PIX_FMT_NONE,
 153 //                  GET_PIX_FMT_NAME)
 154
 155 DEF_CHOOSE_FORMAT(sample_fmts, enum AVSampleFormat, format, formats,
 156                   AV_SAMPLE_FMT_NONE, "%s", av_get_sample_fmt_name)
 157
 158 DEF_CHOOSE_FORMAT(sample_rates, int, sample_rate, sample_rates, 0,
 159                   "%d", )
 160
 161 DEF_CHOOSE_FORMAT(channel_layouts, uint64_t, channel_layout, channel_layouts, 0,
 162                   "0x%"PRIx64, )
 163
 164 int init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 165 {
 166     FilterGraph *fg = av_mallocz(sizeof(*fg));
 167
 168     if (!fg)
 169         exit_program(1);
 170     fg->index = nb_filtergraphs;
 171
 172     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 173     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 174         exit_program(1);
 175     fg->outputs[0]->ost   = ost;
 176     fg->outputs[0]->graph = fg;
 177     fg->outputs[0]->format = -1;
 178
 179     ost->filter = fg->outputs[0];
 180
 181     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 182     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 183         exit_program(1);
 184     fg->inputs[0]->ist   = ist;
 185     fg->inputs[0]->graph = fg;
 186     fg->inputs[0]->format = -1;
 187
 188     fg->inputs[0]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
 189     if (!fg->inputs[0]->frame_queue)
 190         exit_program(1);
 191
 192     GROW_ARRAY(ist->filters, ist->nb_filters);
 193     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 194
 195     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 196     filtergraphs[nb_filtergraphs - 1] = fg;
 197
 198     return 0;
 199 }
 200
 201 static char *describe_filter_link(FilterGraph *fg, AVFilterInOut *inout, int in)
 202 {
 203     AVFilterContext *ctx = inout->filter_ctx;
 204     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;
 205     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;
 206     AVIOContext *pb;
 207     uint8_t *res = NULL;
 208
 209     if (avio_open_dyn_buf(&pb) < 0)
 210         exit_program(1);
 211
 212     avio_printf(pb, "%s", ctx->filter->name);
 213     if (nb_pads > 1)
 214         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));
 215     avio_w8(pb, 0);
 216     avio_close_dyn_buf(pb, &res);
 217     return res;
 218 }
 219
 220 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 221 {
 222     InputStream *ist = NULL;
 223     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 224     int i;
 225
 226     // TODO: support other filter types
 227     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 228         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 229                "currently.\n");
 230         exit_program(1);
 231     }
 232
 233     if (in->name) {
 234         AVFormatContext *s;
 235         AVStream       *st = NULL;
 236         char *p;
 237         int file_idx = strtol(in->name, &p, 0);
 238
 239         if (file_idx < 0 || file_idx >= nb_input_files) {
 240             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 241                    file_idx, fg->graph_desc);
 242             exit_program(1);
 243         }
 244         s = input_files[file_idx]->ctx;
 245
 246         for (i = 0; i < s->nb_streams; i++) {
 247             enum AVMediaType stream_type = s->streams[i]->codecpar->codec_type;
 248             if (stream_type != type &&
 249                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 250                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 251                 continue;
 252             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 253                 st = s->streams[i];
 254                 break;
 255             }
 256         }
 257         if (!st) {
 258             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 259                    "matches no streams.\n", p, fg->graph_desc);
 260             exit_program(1);
 261         }
 262         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 263         if (ist->user_set_discard == AVDISCARD_ALL) {
 264             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 265                    "matches a disabled input stream.\n", p, fg->graph_desc);
 266             exit_program(1);
 267         }
 268     } else {
 269         /* find the first unused stream of corresponding type */
 270         for (i = 0; i < nb_input_streams; i++) {
 271             ist = input_streams[i];
 272             if (ist->user_set_discard == AVDISCARD_ALL)
 273                 continue;
 274             if (ist->dec_ctx->codec_type == type && ist->discard)
 275                 break;
 276         }
 277         if (i == nb_input_streams) {
 278             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 279                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 280                    in->filter_ctx->name);
 281             exit_program(1);
 282         }
 283     }
 284     av_assert0(ist);
 285
 286     ist->discard         = 0;
 287     ist->decoding_needed |= DECODING_FOR_FILTER;
 288     ist->st->discard = AVDISCARD_NONE;
 289
 290     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 291     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 292         exit_program(1);
 293     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 294     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 295     fg->inputs[fg->nb_inputs - 1]->format = -1;
 296     fg->inputs[fg->nb_inputs - 1]->type = ist->st->codecpar->codec_type;
 297     fg->inputs[fg->nb_inputs - 1]->name = describe_filter_link(fg, in, 1);
 298
 299     fg->inputs[fg->nb_inputs - 1]->frame_queue = av_fifo_alloc(8 * sizeof(AVFrame*));
 300     if (!fg->inputs[fg->nb_inputs - 1]->frame_queue)
 301         exit_program(1);
 302
 303     GROW_ARRAY(ist->filters, ist->nb_filters);
 304     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 305 }
 306
 307 int init_complex_filtergraph(FilterGraph *fg)
 308 {
 309     AVFilterInOut *inputs, *outputs, *cur;
 310     AVFilterGraph *graph;
 311     int ret = 0;
 312
 313     /* this graph is only used for determining the kinds of inputs
 314      * and outputs we have, and is discarded on exit from this function */
 315     graph = avfilter_graph_alloc();
 316     if (!graph)
 317         return AVERROR(ENOMEM);
 318     graph->nb_threads = 1;
 319
 320     ret = avfilter_graph_parse2(graph, fg->graph_desc, &inputs, &outputs);
 321     if (ret < 0)
 322         goto fail;
 323
 324     for (cur = inputs; cur; cur = cur->next)
 325         init_input_filter(fg, cur);
 326
 327     for (cur = outputs; cur;) {
 328         GROW_ARRAY(fg->outputs, fg->nb_outputs);
 329         fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]));
 330         if (!fg->outputs[fg->nb_outputs - 1])
 331             exit_program(1);
 332
 333         fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 334         fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 335         fg->outputs[fg->nb_outputs - 1]->type    = avfilter_pad_get_type(cur->filter_ctx->output_pads,
 336                                                                          cur->pad_idx);
 337         fg->outputs[fg->nb_outputs - 1]->name = describe_filter_link(fg, cur, 0);
 338         cur = cur->next;
 339         fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 340     }
 341
 342 fail:
 343     avfilter_inout_free(&inputs);
 344     avfilter_graph_free(&graph);
 345     return ret;
 346 }
 347
 348 static int insert_trim(int64_t start_time, int64_t duration,
 349                        AVFilterContext **last_filter, int *pad_idx,
 350                        const char *filter_name)
 351 {
 352     AVFilterGraph *graph = (*last_filter)->graph;
 353     AVFilterContext *ctx;
 354     const AVFilter *trim;
 355     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 356     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 357     int ret = 0;
 358
 359     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 360         return 0;
 361
 362     trim = avfilter_get_by_name(name);
 363     if (!trim) {
 364         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 365                "recording time.\n", name);
 366         return AVERROR_FILTER_NOT_FOUND;
 367     }
 368
 369     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 370     if (!ctx)
 371         return AVERROR(ENOMEM);
 372
 373     if (duration != INT64_MAX) {
 374         ret = av_opt_set_int(ctx, "durationi", duration,
 375                                 AV_OPT_SEARCH_CHILDREN);
 376     }
 377     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 378         ret = av_opt_set_int(ctx, "starti", start_time,
 379                                 AV_OPT_SEARCH_CHILDREN);
 380     }
 381     if (ret < 0) {
 382         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 383         return ret;
 384     }
 385
 386     ret = avfilter_init_str(ctx, NULL);
 387     if (ret < 0)
 388         return ret;
 389
 390     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 391     if (ret < 0)
 392         return ret;
 393
 394     *last_filter = ctx;
 395     *pad_idx     = 0;
 396     return 0;
 397 }
 398
 399 static int insert_filter(AVFilterContext **last_filter, int *pad_idx,
 400                          const char *filter_name, const char *args)
 401 {
 402     AVFilterGraph *graph = (*last_filter)->graph;
 403     AVFilterContext *ctx;
 404     int ret;
 405
 406     ret = avfilter_graph_create_filter(&ctx,
 407                                        avfilter_get_by_name(filter_name),
 408                                        filter_name, args, NULL, graph);
 409     if (ret < 0)
 410         return ret;
 411
 412     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 413     if (ret < 0)
 414         return ret;
 415
 416     *last_filter = ctx;
 417     *pad_idx     = 0;
 418     return 0;
 419 }
 420
 421 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 422 {
 423     char *pix_fmts;
 424     OutputStream *ost = ofilter->ost;
 425     OutputFile    *of = output_files[ost->file_index];
 426     AVFilterContext *last_filter = out->filter_ctx;
 427     int pad_idx = out->pad_idx;
 428     int ret;
 429     char name[255];
 430
 431     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
 432     ret = avfilter_graph_create_filter(&ofilter->filter,
 433                                        avfilter_get_by_name("buffersink"),
 434                                        name, NULL, NULL, fg->graph);
 435
 436     if (ret < 0)
 437         return ret;
 438
 439     if ((ofilter->width || ofilter->height) && ofilter->ost->autoscale) {
 440         char args[255];
 441         AVFilterContext *filter;
 442         AVDictionaryEntry *e = NULL;
 443
 444         snprintf(args, sizeof(args), "%d:%d",
 445                  ofilter->width, ofilter->height);
 446
 447         while ((e = av_dict_get(ost->sws_dict, "", e,
 448                                 AV_DICT_IGNORE_SUFFIX))) {
 449             av_strlcatf(args, sizeof(args), ":%s=%s", e->key, e->value);
 450         }
 451
 452         snprintf(name, sizeof(name), "scaler_out_%d_%d",
 453                  ost->file_index, ost->index);
 454         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 455                                                 name, args, NULL, fg->graph)) < 0)
 456             return ret;
 457         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 458             return ret;
 459
 460         last_filter = filter;
 461         pad_idx = 0;
 462     }
 463
 464     if ((pix_fmts = choose_pix_fmts(ofilter))) {
 465         AVFilterContext *filter;
 466
 467         ret = avfilter_graph_create_filter(&filter,
 468                                            avfilter_get_by_name("format"),
 469                                            "format", pix_fmts, NULL, fg->graph);
 470         av_freep(&pix_fmts);
 471         if (ret < 0)
 472             return ret;
 473         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 474             return ret;
 475
 476         last_filter = filter;
 477         pad_idx     = 0;
 478     }
 479
 480     if (ost->frame_rate.num && 0) {
 481         AVFilterContext *fps;
 482         char args[255];
 483
 484         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 485                  ost->frame_rate.den);
 486         snprintf(name, sizeof(name), "fps_out_%d_%d",
 487                  ost->file_index, ost->index);
 488         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 489                                            name, args, NULL, fg->graph);
 490         if (ret < 0)
 491             return ret;
 492
 493         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 494         if (ret < 0)
 495             return ret;
 496         last_filter = fps;
 497         pad_idx = 0;
 498     }
 499
 500     snprintf(name, sizeof(name), "trim_out_%d_%d",
 501              ost->file_index, ost->index);
 502     ret = insert_trim(of->start_time, of->recording_time,
 503                       &last_filter, &pad_idx, name);
 504     if (ret < 0)
 505         return ret;
 506
 507
 508     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 509         return ret;
 510
 511     return 0;
 512 }
 513
 514 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 515 {
 516     OutputStream *ost = ofilter->ost;
 517     OutputFile    *of = output_files[ost->file_index];
 518     AVCodecContext *codec  = ost->enc_ctx;
 519     AVFilterContext *last_filter = out->filter_ctx;
 520     int pad_idx = out->pad_idx;
 521     AVBPrint args;
 522     char name[255];
 523     int ret;
 524
 525     snprintf(name, sizeof(name), "out_%d_%d", ost->file_index, ost->index);
 526     ret = avfilter_graph_create_filter(&ofilter->filter,
 527                                        avfilter_get_by_name("abuffersink"),
 528                                        name, NULL, NULL, fg->graph);
 529     if (ret < 0)
 530         return ret;
 531     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 532         return ret;
 533
 534 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 535     AVFilterContext *filt_ctx;                                              \
 536                                                                             \
 537     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 538            "similarly to -af " filter_name "=%s.\n", arg);                  \
 539                                                                             \
 540     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 541                                        avfilter_get_by_name(filter_name),   \
 542                                        filter_name, arg, NULL, fg->graph);  \
 543     if (ret < 0)                                                            \
 544         goto fail;                                                          \
 545                                                                             \
 546     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 547     if (ret < 0)                                                            \
 548         goto fail;                                                          \
 549                                                                             \
 550     last_filter = filt_ctx;                                                 \
 551     pad_idx = 0;                                                            \
 552 } while (0)
 553     av_bprint_init(&args, 0, AV_BPRINT_SIZE_UNLIMITED);
 554     if (ost->audio_channels_mapped) {
 555         int i;
 556         av_bprintf(&args, "0x%"PRIx64,
 557                    av_get_default_channel_layout(ost->audio_channels_mapped));
 558         for (i = 0; i < ost->audio_channels_mapped; i++)
 559             if (ost->audio_channels_map[i] != -1)
 560                 av_bprintf(&args, "|c%d=c%d", i, ost->audio_channels_map[i]);
 561
 562         AUTO_INSERT_FILTER("-map_channel", "pan", args.str);
 563         av_bprint_clear(&args);
 564     }
 565
 566     if (codec->channels && !codec->channel_layout)
 567         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 568
 569     choose_sample_fmts(ofilter,     &args);
 570     choose_sample_rates(ofilter,    &args);
 571     choose_channel_layouts(ofilter, &args);
 572     if (!av_bprint_is_complete(&args)) {
 573         ret = AVERROR(ENOMEM);
 574         goto fail;
 575     }
 576     if (args.len) {
 577         AVFilterContext *format;
 578
 579         snprintf(name, sizeof(name), "format_out_%d_%d",
 580                  ost->file_index, ost->index);
 581         ret = avfilter_graph_create_filter(&format,
 582                                            avfilter_get_by_name("aformat"),
 583                                            name, args.str, NULL, fg->graph);
 584         if (ret < 0)
 585             goto fail;
 586
 587         ret = avfilter_link(last_filter, pad_idx, format, 0);
 588         if (ret < 0)
 589             goto fail;
 590
 591         last_filter = format;
 592         pad_idx = 0;
 593     }
 594
 595     if (ost->apad && of->shortest) {
 596         char args[256];
 597         int i;
 598
 599         for (i=0; i<of->ctx->nb_streams; i++)
 600             if (of->ctx->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO)
 601                 break;
 602
 603         if (i<of->ctx->nb_streams) {
 604             snprintf(args, sizeof(args), "%s", ost->apad);
 605             AUTO_INSERT_FILTER("-apad", "apad", args);
 606         }
 607     }
 608
 609     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 610              ost->file_index, ost->index);
 611     ret = insert_trim(of->start_time, of->recording_time,
 612                       &last_filter, &pad_idx, name);
 613     if (ret < 0)
 614         goto fail;
 615
 616     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 617         goto fail;
 618 fail:
 619     av_bprint_finalize(&args, NULL);
 620
 621     return ret;
 622 }
 623
 624 static int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter,
 625                                    AVFilterInOut *out)
 626 {
 627     if (!ofilter->ost) {
 628         av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", ofilter->name);
 629         exit_program(1);
 630     }
 631
 632     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 633     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 634     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 635     default: av_assert0(0);
 636     }
 637 }
 638
 639 void check_filter_outputs(void)
 640 {
 641     int i;
 642     for (i = 0; i < nb_filtergraphs; i++) {
 643         int n;
 644         for (n = 0; n < filtergraphs[i]->nb_outputs; n++) {
 645             OutputFilter *output = filtergraphs[i]->outputs[n];
 646             if (!output->ost) {
 647                 av_log(NULL, AV_LOG_FATAL, "Filter %s has an unconnected output\n", output->name);
 648                 exit_program(1);
 649             }
 650         }
 651     }
 652 }
 653
 654 static int sub2video_prepare(InputStream *ist, InputFilter *ifilter)
 655 {
 656     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 657     int i, w, h;
 658
 659     /* Compute the size of the canvas for the subtitles stream.
 660        If the subtitles codecpar has set a size, use it. Otherwise use the
 661        maximum dimensions of the video streams in the same file. */
 662     w = ifilter->width;
 663     h = ifilter->height;
 664     if (!(w && h)) {
 665         for (i = 0; i < avf->nb_streams; i++) {
 666             if (avf->streams[i]->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
 667                 w = FFMAX(w, avf->streams[i]->codecpar->width);
 668                 h = FFMAX(h, avf->streams[i]->codecpar->height);
 669             }
 670         }
 671         if (!(w && h)) {
 672             w = FFMAX(w, 720);
 673             h = FFMAX(h, 576);
 674         }
 675         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 676     }
 677     ist->sub2video.w = ifilter->width  = w;
 678     ist->sub2video.h = ifilter->height = h;
 679
 680     ifilter->width  = ist->dec_ctx->width  ? ist->dec_ctx->width  : ist->sub2video.w;
 681     ifilter->height = ist->dec_ctx->height ? ist->dec_ctx->height : ist->sub2video.h;
 682
 683     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 684        palettes for all rectangles are identical or compatible */
 685     ifilter->format = AV_PIX_FMT_RGB32;
 686
 687     ist->sub2video.frame = av_frame_alloc();
 688     if (!ist->sub2video.frame)
 689         return AVERROR(ENOMEM);
 690     ist->sub2video.last_pts = INT64_MIN;
 691     ist->sub2video.end_pts  = INT64_MIN;
 692
 693     /* sub2video structure has been (re-)initialized.
 694        Mark it as such so that the system will be
 695        initialized with the first received heartbeat. */
 696     ist->sub2video.initialize = 1;
 697
 698     return 0;
 699 }
 700
 701 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 702                                         AVFilterInOut *in)
 703 {
 704     AVFilterContext *last_filter;
 705     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 706     InputStream *ist = ifilter->ist;
 707     InputFile     *f = input_files[ist->file_index];
 708     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 709                                          ist->st->time_base;
 710     AVRational fr = ist->framerate;
 711     AVRational sar;
 712     AVBPrint args;
 713     char name[255];
 714     int ret, pad_idx = 0;
 715     int64_t tsoffset = 0;
 716     AVBufferSrcParameters *par = av_buffersrc_parameters_alloc();
 717
 718     if (!par)
 719         return AVERROR(ENOMEM);
 720     memset(par, 0, sizeof(*par));
 721     par->format = AV_PIX_FMT_NONE;
 722
 723     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
 724         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 725         ret = AVERROR(EINVAL);
 726         goto fail;
 727     }
 728
 729     if (!fr.num)
 730         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 731
 732     if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 733         ret = sub2video_prepare(ist, ifilter);
 734         if (ret < 0)
 735             goto fail;
 736     }
 737
 738     sar = ifilter->sample_aspect_ratio;
 739     if(!sar.den)
 740         sar = (AVRational){0,1};
 741     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 742     av_bprintf(&args,
 743              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 744              "pixel_aspect=%d/%d",
 745              ifilter->width, ifilter->height, ifilter->format,
 746              tb.num, tb.den, sar.num, sar.den);
 747     if (fr.num && fr.den)
 748         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 749     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 750              ist->file_index, ist->st->index);
 751
 752
 753     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 754                                             args.str, NULL, fg->graph)) < 0)
 755         goto fail;
 756     par->hw_frames_ctx = ifilter->hw_frames_ctx;
 757     ret = av_buffersrc_parameters_set(ifilter->filter, par);
 758     if (ret < 0)
 759         goto fail;
 760     av_freep(&par);
 761     last_filter = ifilter->filter;
 762
 763     if (ist->autorotate) {
 764         double theta = get_rotation(ist->st);
 765
 766         if (fabs(theta - 90) < 1.0) {
 767             ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
 768         } else if (fabs(theta - 180) < 1.0) {
 769             ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
 770             if (ret < 0)
 771                 return ret;
 772             ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
 773         } else if (fabs(theta - 270) < 1.0) {
 774             ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
 775         } else if (fabs(theta) > 1.0) {
 776             char rotate_buf[64];
 777             snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
 778             ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
 779         }
 780         if (ret < 0)
 781             return ret;
 782     }
 783
 784     if (do_deinterlace) {
 785         AVFilterContext *yadif;
 786
 787         snprintf(name, sizeof(name), "deinterlace_in_%d_%d",
 788                  ist->file_index, ist->st->index);
 789         if ((ret = avfilter_graph_create_filter(&yadif,
 790                                                 avfilter_get_by_name("yadif"),
 791                                                 name, "", NULL,
 792                                                 fg->graph)) < 0)
 793             return ret;
 794
 795         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 796             return ret;
 797
 798         last_filter = yadif;
 799     }
 800
 801     snprintf(name, sizeof(name), "trim_in_%d_%d",
 802              ist->file_index, ist->st->index);
 803     if (copy_ts) {
 804         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 805         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 806             tsoffset += f->ctx->start_time;
 807     }
 808     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 809                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 810                       &last_filter, &pad_idx, name);
 811     if (ret < 0)
 812         return ret;
 813
 814     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 815         return ret;
 816     return 0;
 817 fail:
 818     av_freep(&par);
 819
 820     return ret;
 821 }
 822
 823 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 824                                         AVFilterInOut *in)
 825 {
 826     AVFilterContext *last_filter;
 827     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 828     InputStream *ist = ifilter->ist;
 829     InputFile     *f = input_files[ist->file_index];
 830     AVBPrint args;
 831     char name[255];
 832     int ret, pad_idx = 0;
 833     int64_t tsoffset = 0;
 834
 835     if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
 836         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 837         return AVERROR(EINVAL);
 838     }
 839
 840     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 841     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 842              1, ifilter->sample_rate,
 843              ifilter->sample_rate,
 844              av_get_sample_fmt_name(ifilter->format));
 845     if (ifilter->channel_layout)
 846         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 847                    ifilter->channel_layout);
 848     else
 849         av_bprintf(&args, ":channels=%d", ifilter->channels);
 850     snprintf(name, sizeof(name), "graph_%d_in_%d_%d", fg->index,
 851              ist->file_index, ist->st->index);
 852
 853     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 854                                             name, args.str, NULL,
 855                                             fg->graph)) < 0)
 856         return ret;
 857     last_filter = ifilter->filter;
 858
 859 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 860     AVFilterContext *filt_ctx;                                              \
 861                                                                             \
 862     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 863            "similarly to -af " filter_name "=%s.\n", arg);                  \
 864                                                                             \
 865     snprintf(name, sizeof(name), "graph_%d_%s_in_%d_%d",      \
 866                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 867     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 868                                        avfilter_get_by_name(filter_name),   \
 869                                        name, arg, NULL, fg->graph);         \
 870     if (ret < 0)                                                            \
 871         return ret;                                                         \
 872                                                                             \
 873     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 874     if (ret < 0)                                                            \
 875         return ret;                                                         \
 876                                                                             \
 877     last_filter = filt_ctx;                                                 \
 878 } while (0)
 879
 880     if (audio_sync_method > 0) {
 881         char args[256] = {0};
 882
 883         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 884         if (audio_drift_threshold != 0.1)
 885             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 886         if (!fg->reconfiguration)
 887             av_strlcatf(args, sizeof(args), ":first_pts=0");
 888         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 889     }
 890
 891 //     if (ost->audio_channels_mapped) {
 892 //         int i;
 893 //         AVBPrint pan_buf;
 894 //         av_bprint_init(&pan_buf, 256, 8192);
 895 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 896 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 897 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 898 //             if (ost->audio_channels_map[i] != -1)
 899 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 900 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 901 //         av_bprint_finalize(&pan_buf, NULL);
 902 //     }
 903
 904     if (audio_volume != 256) {
 905         char args[256];
 906
 907         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 908                "audio filter instead.\n");
 909
 910         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 911         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 912     }
 913
 914     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 915              ist->file_index, ist->st->index);
 916     if (copy_ts) {
 917         tsoffset = f->start_time == AV_NOPTS_VALUE ? 0 : f->start_time;
 918         if (!start_at_zero && f->ctx->start_time != AV_NOPTS_VALUE)
 919             tsoffset += f->ctx->start_time;
 920     }
 921     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 922                       AV_NOPTS_VALUE : tsoffset, f->recording_time,
 923                       &last_filter, &pad_idx, name);
 924     if (ret < 0)
 925         return ret;
 926
 927     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 928         return ret;
 929
 930     return 0;
 931 }
 932
 933 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 934                                   AVFilterInOut *in)
 935 {
 936     if (!ifilter->ist->dec) {
 937         av_log(NULL, AV_LOG_ERROR,
 938                "No decoder for stream #%d:%d, filtering impossible\n",
 939                ifilter->ist->file_index, ifilter->ist->st->index);
 940         return AVERROR_DECODER_NOT_FOUND;
 941     }
 942     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 943     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 944     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 945     default: av_assert0(0);
 946     }
 947 }
 948
 949 static void cleanup_filtergraph(FilterGraph *fg)
 950 {
 951     int i;
 952     for (i = 0; i < fg->nb_outputs; i++)
 953         fg->outputs[i]->filter = (AVFilterContext *)NULL;
 954     for (i = 0; i < fg->nb_inputs; i++)
 955         fg->inputs[i]->filter = (AVFilterContext *)NULL;
 956     avfilter_graph_free(&fg->graph);
 957 }
 958
 959 int configure_filtergraph(FilterGraph *fg)
 960 {
 961     AVFilterInOut *inputs, *outputs, *cur;
 962     int ret, i, simple = filtergraph_is_simple(fg);
 963     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 964                                       fg->graph_desc;
 965
 966     cleanup_filtergraph(fg);
 967     if (!(fg->graph = avfilter_graph_alloc()))
 968         return AVERROR(ENOMEM);
 969
 970     if (simple) {
 971         OutputStream *ost = fg->outputs[0]->ost;
 972         char args[512];
 973         AVDictionaryEntry *e = NULL;
 974
 975         fg->graph->nb_threads = filter_nbthreads;
 976
 977         args[0] = 0;
 978         while ((e = av_dict_get(ost->sws_dict, "", e,
 979                                 AV_DICT_IGNORE_SUFFIX))) {
 980             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 981         }
 982         if (strlen(args))
 983             args[strlen(args)-1] = 0;
 984         fg->graph->scale_sws_opts = av_strdup(args);
 985
 986         args[0] = 0;
 987         while ((e = av_dict_get(ost->swr_opts, "", e,
 988                                 AV_DICT_IGNORE_SUFFIX))) {
 989             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 990         }
 991         if (strlen(args))
 992             args[strlen(args)-1] = 0;
 993         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 994
 995         args[0] = '\0';
 996         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 997                                 AV_DICT_IGNORE_SUFFIX))) {
 998             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 999         }
1000         if (strlen(args))
1001             args[strlen(args) - 1] = '\0';
1002
1003         e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
1004         if (e)
1005             av_opt_set(fg->graph, "threads", e->value, 0);
1006     } else {
1007         fg->graph->nb_threads = filter_complex_nbthreads;
1008     }
1009
1010     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
1011         goto fail;
1012
1013     ret = hw_device_setup_for_filter(fg);
1014     if (ret < 0)
1015         goto fail;
1016
1017     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
1018         const char *num_inputs;
1019         const char *num_outputs;
1020         if (!outputs) {
1021             num_outputs = "0";
1022         } else if (outputs->next) {
1023             num_outputs = ">1";
1024         } else {
1025             num_outputs = "1";
1026         }
1027         if (!inputs) {
1028             num_inputs = "0";
1029         } else if (inputs->next) {
1030             num_inputs = ">1";
1031         } else {
1032             num_inputs = "1";
1033         }
1034         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' was expected "
1035                "to have exactly 1 input and 1 output."
1036                " However, it had %s input(s) and %s output(s)."
1037                " Please adjust, or use a complex filtergraph (-filter_complex) instead.\n",
1038                graph_desc, num_inputs, num_outputs);
1039         ret = AVERROR(EINVAL);
1040         goto fail;
1041     }
1042
1043     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
1044         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
1045             avfilter_inout_free(&inputs);
1046             avfilter_inout_free(&outputs);
1047             goto fail;
1048         }
1049     avfilter_inout_free(&inputs);
1050
1051     for (cur = outputs, i = 0; cur; cur = cur->next, i++)
1052         configure_output_filter(fg, fg->outputs[i], cur);
1053     avfilter_inout_free(&outputs);
1054
1055     if (!auto_conversion_filters)
1056         avfilter_graph_set_auto_convert(fg->graph, AVFILTER_AUTO_CONVERT_NONE);
1057     if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
1058         goto fail;
1059
1060     /* limit the lists of allowed formats to the ones selected, to
1061      * make sure they stay the same if the filtergraph is reconfigured later */
1062     for (i = 0; i < fg->nb_outputs; i++) {
1063         OutputFilter *ofilter = fg->outputs[i];
1064         AVFilterContext *sink = ofilter->filter;
1065
1066         ofilter->format = av_buffersink_get_format(sink);
1067
1068         ofilter->width  = av_buffersink_get_w(sink);
1069         ofilter->height = av_buffersink_get_h(sink);
1070
1071         ofilter->sample_rate    = av_buffersink_get_sample_rate(sink);
1072         ofilter->channel_layout = av_buffersink_get_channel_layout(sink);
1073     }
1074
1075     fg->reconfiguration = 1;
1076
1077     for (i = 0; i < fg->nb_outputs; i++) {
1078         OutputStream *ost = fg->outputs[i]->ost;
1079         if (!ost->enc) {
1080             /* identical to the same check in ffmpeg.c, needed because
1081                complex filter graphs are initialized earlier */
1082             av_log(NULL, AV_LOG_ERROR, "Encoder (codec %s) not found for output stream #%d:%d\n",
1083                      avcodec_get_name(ost->st->codecpar->codec_id), ost->file_index, ost->index);
1084             ret = AVERROR(EINVAL);
1085             goto fail;
1086         }
1087         if (ost->enc->type == AVMEDIA_TYPE_AUDIO &&
1088             !(ost->enc->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE))
1089             av_buffersink_set_frame_size(ost->filter->filter,
1090                                          ost->enc_ctx->frame_size);
1091     }
1092
1093     for (i = 0; i < fg->nb_inputs; i++) {
1094         while (av_fifo_size(fg->inputs[i]->frame_queue)) {
1095             AVFrame *tmp;
1096             av_fifo_generic_read(fg->inputs[i]->frame_queue, &tmp, sizeof(tmp), NULL);
1097             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, tmp);
1098             av_frame_free(&tmp);
1099             if (ret < 0)
1100                 goto fail;
1101         }
1102     }
1103
1104     /* send the EOFs for the finished inputs */
1105     for (i = 0; i < fg->nb_inputs; i++) {
1106         if (fg->inputs[i]->eof) {
1107             ret = av_buffersrc_add_frame(fg->inputs[i]->filter, NULL);
1108             if (ret < 0)
1109                 goto fail;
1110         }
1111     }
1112
1113     /* process queued up subtitle packets */
1114     for (i = 0; i < fg->nb_inputs; i++) {
1115         InputStream *ist = fg->inputs[i]->ist;
1116         if (ist->sub2video.sub_queue && ist->sub2video.frame) {
1117             while (av_fifo_size(ist->sub2video.sub_queue)) {
1118                 AVSubtitle tmp;
1119                 av_fifo_generic_read(ist->sub2video.sub_queue, &tmp, sizeof(tmp), NULL);
1120                 sub2video_update(ist, INT64_MIN, &tmp);
1121                 avsubtitle_free(&tmp);
1122             }
1123         }
1124     }
1125
1126     return 0;
1127
1128 fail:
1129     cleanup_filtergraph(fg);
1130     return ret;
1131 }
1132
1133 int ifilter_parameters_from_frame(InputFilter *ifilter, const AVFrame *frame)
1134 {
1135     av_buffer_unref(&ifilter->hw_frames_ctx);
1136
1137     ifilter->format = frame->format;
1138
1139     ifilter->width               = frame->width;
1140     ifilter->height              = frame->height;
1141     ifilter->sample_aspect_ratio = frame->sample_aspect_ratio;
1142
1143     ifilter->sample_rate         = frame->sample_rate;
1144     ifilter->channels            = frame->channels;
1145     ifilter->channel_layout      = frame->channel_layout;
1146
1147     if (frame->hw_frames_ctx) {
1148         ifilter->hw_frames_ctx = av_buffer_ref(frame->hw_frames_ctx);
1149         if (!ifilter->hw_frames_ctx)
1150             return AVERROR(ENOMEM);
1151     }
1152
1153     return 0;
1154 }
1155
1156 int filtergraph_is_simple(FilterGraph *fg)
1157 {
1158     return !fg->graph_desc;
1159 }