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   1 /*
   2  * ffmpeg filter configuration
   3  *
   4  * This file is part of FFmpeg.
   5  *
   6  * FFmpeg is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * FFmpeg is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with FFmpeg; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 #include <stdint.h>
  22
  23 #include "ffmpeg.h"
  24
  25 #include "libavfilter/avfilter.h"
  26 #include "libavfilter/buffersink.h"
  27
  28 #include "libavresample/avresample.h"
  29
  30 #include "libavutil/avassert.h"
  31 #include "libavutil/avstring.h"
  32 #include "libavutil/bprint.h"
  33 #include "libavutil/channel_layout.h"
  34 #include "libavutil/opt.h"
  35 #include "libavutil/pixdesc.h"
  36 #include "libavutil/pixfmt.h"
  37 #include "libavutil/imgutils.h"
  38 #include "libavutil/samplefmt.h"
  39
  40 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  41 {
  42     if (codec && codec->pix_fmts) {
  43         const enum AVPixelFormat *p = codec->pix_fmts;
  44         const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
  45         int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
  46         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  47         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  48             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  49                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  50             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  51                 p = (const enum AVPixelFormat[]) { 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         }
  55         for (; *p != AV_PIX_FMT_NONE; p++) {
  56             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  57             if (*p == target)
  58                 break;
  59         }
  60         if (*p == AV_PIX_FMT_NONE) {
  61             if (target != AV_PIX_FMT_NONE)
  62                 av_log(NULL, AV_LOG_WARNING,
  63                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  64                        av_get_pix_fmt_name(target),
  65                        codec->name,
  66                        av_get_pix_fmt_name(best));
  67             return best;
  68         }
  69     }
  70     return target;
  71 }
  72
  73 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  74 {
  75     if (codec && codec->sample_fmts) {
  76         const enum AVSampleFormat *p = codec->sample_fmts;
  77         for (; *p != -1; p++) {
  78             if (*p == st->codec->sample_fmt)
  79                 break;
  80         }
  81         if (*p == -1) {
  82             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  83                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  84             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  85             av_log(NULL, AV_LOG_WARNING,
  86                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  87                    av_get_sample_fmt_name(st->codec->sample_fmt),
  88                    codec->name,
  89                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  90             st->codec->sample_fmt = codec->sample_fmts[0];
  91         }
  92     }
  93 }
  94
  95 static char *choose_pix_fmts(OutputStream *ost)
  96 {
  97     AVDictionaryEntry *strict_dict = av_dict_get(ost->opts, "strict", NULL, 0);
  98     if (strict_dict)
  99         // used by choose_pixel_fmt() and below
 100         av_opt_set(ost->st->codec, "strict", strict_dict->value, 0);
 101
 102      if (ost->keep_pix_fmt) {
 103         if (ost->filter)
 104             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
 105                                             AVFILTER_AUTO_CONVERT_NONE);
 106         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
 107             return NULL;
 108         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
 109     }
 110     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 111         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 112     } else if (ost->enc && ost->enc->pix_fmts) {
 113         const enum AVPixelFormat *p;
 114         AVIOContext *s = NULL;
 115         uint8_t *ret;
 116         int len;
 117
 118         if (avio_open_dyn_buf(&s) < 0)
 119             exit_program(1);
 120
 121         p = ost->enc->pix_fmts;
 122         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 123             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 124                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 125             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 126                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 127                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 128             }
 129         }
 130
 131         for (; *p != AV_PIX_FMT_NONE; p++) {
 132             const char *name = av_get_pix_fmt_name(*p);
 133             avio_printf(s, "%s|", name);
 134         }
 135         len = avio_close_dyn_buf(s, &ret);
 136         ret[len - 1] = 0;
 137         return ret;
 138     } else
 139         return NULL;
 140 }
 141
 142 /* Define a function for building a string containing a list of
 143  * allowed formats. */
 144 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name)           \
 145 static char *choose_ ## var ## s(OutputStream *ost)                            \
 146 {                                                                              \
 147     if (ost->st->codec->var != none) {                                         \
 148         get_name(ost->st->codec->var);                                         \
 149         return av_strdup(name);                                                \
 150     } else if (ost->enc && ost->enc->supported_list) {                         \
 151         const type *p;                                                         \
 152         AVIOContext *s = NULL;                                                 \
 153         uint8_t *ret;                                                          \
 154         int len;                                                               \
 155                                                                                \
 156         if (avio_open_dyn_buf(&s) < 0)                                         \
 157             exit_program(1);                                                           \
 158                                                                                \
 159         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 160             get_name(*p);                                                      \
 161             avio_printf(s, "%s|", name);                                       \
 162         }                                                                      \
 163         len = avio_close_dyn_buf(s, &ret);                                     \
 164         ret[len - 1] = 0;                                                      \
 165         return ret;                                                            \
 166     } else                                                                     \
 167         return NULL;                                                           \
 168 }
 169
 170 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 171 //                   GET_PIX_FMT_NAME)
 172
 173 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 174                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
 175
 176 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 177                   GET_SAMPLE_RATE_NAME)
 178
 179 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 180                   GET_CH_LAYOUT_NAME)
 181
 182 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 183 {
 184     FilterGraph *fg = av_mallocz(sizeof(*fg));
 185
 186     if (!fg)
 187         exit_program(1);
 188     fg->index = nb_filtergraphs;
 189
 190     GROW_ARRAY(fg->outputs, fg->nb_outputs);
 191     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 192         exit_program(1);
 193     fg->outputs[0]->ost   = ost;
 194     fg->outputs[0]->graph = fg;
 195
 196     ost->filter = fg->outputs[0];
 197
 198     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 199     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 200         exit_program(1);
 201     fg->inputs[0]->ist   = ist;
 202     fg->inputs[0]->graph = fg;
 203
 204     GROW_ARRAY(ist->filters, ist->nb_filters);
 205     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 206
 207     GROW_ARRAY(filtergraphs, nb_filtergraphs);
 208     filtergraphs[nb_filtergraphs - 1] = fg;
 209
 210     return fg;
 211 }
 212
 213 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 214 {
 215     InputStream *ist = NULL;
 216     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 217     int i;
 218
 219     // TODO: support other filter types
 220     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 221         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 222                "currently.\n");
 223         exit_program(1);
 224     }
 225
 226     if (in->name) {
 227         AVFormatContext *s;
 228         AVStream       *st = NULL;
 229         char *p;
 230         int file_idx = strtol(in->name, &p, 0);
 231
 232         if (file_idx < 0 || file_idx >= nb_input_files) {
 233             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 234                    file_idx, fg->graph_desc);
 235             exit_program(1);
 236         }
 237         s = input_files[file_idx]->ctx;
 238
 239         for (i = 0; i < s->nb_streams; i++) {
 240             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 241             if (stream_type != type &&
 242                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 243                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 244                 continue;
 245             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 246                 st = s->streams[i];
 247                 break;
 248             }
 249         }
 250         if (!st) {
 251             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 252                    "matches no streams.\n", p, fg->graph_desc);
 253             exit_program(1);
 254         }
 255         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 256     } else {
 257         /* find the first unused stream of corresponding type */
 258         for (i = 0; i < nb_input_streams; i++) {
 259             ist = input_streams[i];
 260             if (ist->st->codec->codec_type == type && ist->discard)
 261                 break;
 262         }
 263         if (i == nb_input_streams) {
 264             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 265                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 266                    in->filter_ctx->name);
 267             exit_program(1);
 268         }
 269     }
 270     av_assert0(ist);
 271
 272     ist->discard         = 0;
 273     ist->decoding_needed++;
 274     ist->st->discard = AVDISCARD_NONE;
 275
 276     GROW_ARRAY(fg->inputs, fg->nb_inputs);
 277     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 278         exit_program(1);
 279     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 280     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 281
 282     GROW_ARRAY(ist->filters, ist->nb_filters);
 283     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 284 }
 285
 286 static int insert_trim(int64_t start_time, int64_t duration,
 287                        AVFilterContext **last_filter, int *pad_idx,
 288                        const char *filter_name)
 289 {
 290     AVFilterGraph *graph = (*last_filter)->graph;
 291     AVFilterContext *ctx;
 292     const AVFilter *trim;
 293     enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
 294     const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
 295     int ret = 0;
 296
 297     if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
 298         return 0;
 299
 300     trim = avfilter_get_by_name(name);
 301     if (!trim) {
 302         av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
 303                "recording time.\n", name);
 304         return AVERROR_FILTER_NOT_FOUND;
 305     }
 306
 307     ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
 308     if (!ctx)
 309         return AVERROR(ENOMEM);
 310
 311     if (duration != INT64_MAX) {
 312         ret = av_opt_set_int(ctx, "durationi", duration,
 313                                 AV_OPT_SEARCH_CHILDREN);
 314     }
 315     if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
 316         ret = av_opt_set_int(ctx, "starti", start_time,
 317                                 AV_OPT_SEARCH_CHILDREN);
 318     }
 319     if (ret < 0) {
 320         av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
 321         return ret;
 322     }
 323
 324     ret = avfilter_init_str(ctx, NULL);
 325     if (ret < 0)
 326         return ret;
 327
 328     ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
 329     if (ret < 0)
 330         return ret;
 331
 332     *last_filter = ctx;
 333     *pad_idx     = 0;
 334     return 0;
 335 }
 336
 337 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 338 {
 339     char *pix_fmts;
 340     OutputStream *ost = ofilter->ost;
 341     OutputFile    *of = output_files[ost->file_index];
 342     AVCodecContext *codec = ost->st->codec;
 343     AVFilterContext *last_filter = out->filter_ctx;
 344     int pad_idx = out->pad_idx;
 345     int ret;
 346     char name[255];
 347
 348     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 349     ret = avfilter_graph_create_filter(&ofilter->filter,
 350                                        avfilter_get_by_name("buffersink"),
 351                                        name, NULL, NULL, fg->graph);
 352
 353     if (ret < 0)
 354         return ret;
 355
 356     if (codec->width || codec->height) {
 357         char args[255];
 358         AVFilterContext *filter;
 359
 360         snprintf(args, sizeof(args), "%d:%d:0x%X",
 361                  codec->width,
 362                  codec->height,
 363                  (unsigned)ost->sws_flags);
 364         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 365                  ost->file_index, ost->index);
 366         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 367                                                 name, args, NULL, fg->graph)) < 0)
 368             return ret;
 369         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 370             return ret;
 371
 372         last_filter = filter;
 373         pad_idx = 0;
 374     }
 375
 376     if ((pix_fmts = choose_pix_fmts(ost))) {
 377         AVFilterContext *filter;
 378         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 379                  ost->file_index, ost->index);
 380         ret = avfilter_graph_create_filter(&filter,
 381                                                 avfilter_get_by_name("format"),
 382                                                 "format", pix_fmts, NULL,
 383                                                 fg->graph);
 384         av_freep(&pix_fmts);
 385         if (ret < 0)
 386             return ret;
 387         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 388             return ret;
 389
 390         last_filter = filter;
 391         pad_idx     = 0;
 392     }
 393
 394     if (ost->frame_rate.num && 0) {
 395         AVFilterContext *fps;
 396         char args[255];
 397
 398         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 399                  ost->frame_rate.den);
 400         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 401                  ost->file_index, ost->index);
 402         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 403                                            name, args, NULL, fg->graph);
 404         if (ret < 0)
 405             return ret;
 406
 407         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 408         if (ret < 0)
 409             return ret;
 410         last_filter = fps;
 411         pad_idx = 0;
 412     }
 413
 414     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 415              ost->file_index, ost->index);
 416     ret = insert_trim(of->start_time, of->recording_time,
 417                       &last_filter, &pad_idx, name);
 418     if (ret < 0)
 419         return ret;
 420
 421
 422     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 423         return ret;
 424
 425     return 0;
 426 }
 427
 428 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 429 {
 430     OutputStream *ost = ofilter->ost;
 431     OutputFile    *of = output_files[ost->file_index];
 432     AVCodecContext *codec  = ost->st->codec;
 433     AVFilterContext *last_filter = out->filter_ctx;
 434     int pad_idx = out->pad_idx;
 435     char *sample_fmts, *sample_rates, *channel_layouts;
 436     char name[255];
 437     int ret;
 438
 439     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 440     ret = avfilter_graph_create_filter(&ofilter->filter,
 441                                        avfilter_get_by_name("abuffersink"),
 442                                        name, NULL, NULL, fg->graph);
 443     if (ret < 0)
 444         return ret;
 445     if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
 446         return ret;
 447
 448 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 449     AVFilterContext *filt_ctx;                                              \
 450                                                                             \
 451     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 452            "similarly to -af " filter_name "=%s.\n", arg);                  \
 453                                                                             \
 454     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 455                                        avfilter_get_by_name(filter_name),   \
 456                                        filter_name, arg, NULL, fg->graph);  \
 457     if (ret < 0)                                                            \
 458         return ret;                                                         \
 459                                                                             \
 460     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 461     if (ret < 0)                                                            \
 462         return ret;                                                         \
 463                                                                             \
 464     last_filter = filt_ctx;                                                 \
 465     pad_idx = 0;                                                            \
 466 } while (0)
 467     if (ost->audio_channels_mapped) {
 468         int i;
 469         AVBPrint pan_buf;
 470         av_bprint_init(&pan_buf, 256, 8192);
 471         av_bprintf(&pan_buf, "0x%"PRIx64,
 472                    av_get_default_channel_layout(ost->audio_channels_mapped));
 473         for (i = 0; i < ost->audio_channels_mapped; i++)
 474             if (ost->audio_channels_map[i] != -1)
 475                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 476
 477         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 478         av_bprint_finalize(&pan_buf, NULL);
 479     }
 480
 481     if (codec->channels && !codec->channel_layout)
 482         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 483
 484     sample_fmts     = choose_sample_fmts(ost);
 485     sample_rates    = choose_sample_rates(ost);
 486     channel_layouts = choose_channel_layouts(ost);
 487     if (sample_fmts || sample_rates || channel_layouts) {
 488         AVFilterContext *format;
 489         char args[256];
 490         args[0] = 0;
 491
 492         if (sample_fmts)
 493             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 494                             sample_fmts);
 495         if (sample_rates)
 496             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 497                             sample_rates);
 498         if (channel_layouts)
 499             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 500                             channel_layouts);
 501
 502         av_freep(&sample_fmts);
 503         av_freep(&sample_rates);
 504         av_freep(&channel_layouts);
 505
 506         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 507                  ost->file_index, ost->index);
 508         ret = avfilter_graph_create_filter(&format,
 509                                            avfilter_get_by_name("aformat"),
 510                                            name, args, NULL, fg->graph);
 511         if (ret < 0)
 512             return ret;
 513
 514         ret = avfilter_link(last_filter, pad_idx, format, 0);
 515         if (ret < 0)
 516             return ret;
 517
 518         last_filter = format;
 519         pad_idx = 0;
 520     }
 521
 522     if (audio_volume != 256 && 0) {
 523         char args[256];
 524
 525         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 526         AUTO_INSERT_FILTER("-vol", "volume", args);
 527     }
 528
 529     if (ost->apad && of->shortest) {
 530         char args[256];
 531         int i;
 532
 533         for (i=0; i<of->ctx->nb_streams; i++)
 534             if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
 535                 break;
 536
 537         if (i<of->ctx->nb_streams) {
 538             snprintf(args, sizeof(args), "%s", ost->apad);
 539             AUTO_INSERT_FILTER("-apad", "apad", args);
 540         }
 541     }
 542
 543     snprintf(name, sizeof(name), "trim for output stream %d:%d",
 544              ost->file_index, ost->index);
 545     ret = insert_trim(of->start_time, of->recording_time,
 546                       &last_filter, &pad_idx, name);
 547     if (ret < 0)
 548         return ret;
 549
 550     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 551         return ret;
 552
 553     return 0;
 554 }
 555
 556 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 557 {                                                                  \
 558     AVFilterContext *ctx = inout->filter_ctx;                      \
 559     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 560     int       nb_pads = in ? ctx->nb_inputs   : ctx->nb_outputs;   \
 561     AVIOContext *pb;                                               \
 562                                                                    \
 563     if (avio_open_dyn_buf(&pb) < 0)                                \
 564         exit_program(1);                                           \
 565                                                                    \
 566     avio_printf(pb, "%s", ctx->filter->name);                      \
 567     if (nb_pads > 1)                                               \
 568         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 569     avio_w8(pb, 0);                                                \
 570     avio_close_dyn_buf(pb, &f->name);                              \
 571 }
 572
 573 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 574 {
 575     av_freep(&ofilter->name);
 576     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 577
 578     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 579     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 580     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 581     default: av_assert0(0);
 582     }
 583 }
 584
 585 static int sub2video_prepare(InputStream *ist)
 586 {
 587     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 588     int i, w, h;
 589
 590     /* Compute the size of the canvas for the subtitles stream.
 591        If the subtitles codec has set a size, use it. Otherwise use the
 592        maximum dimensions of the video streams in the same file. */
 593     w = ist->st->codec->width;
 594     h = ist->st->codec->height;
 595     if (!(w && h)) {
 596         for (i = 0; i < avf->nb_streams; i++) {
 597             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 598                 w = FFMAX(w, avf->streams[i]->codec->width);
 599                 h = FFMAX(h, avf->streams[i]->codec->height);
 600             }
 601         }
 602         if (!(w && h)) {
 603             w = FFMAX(w, 720);
 604             h = FFMAX(h, 576);
 605         }
 606         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 607     }
 608     ist->sub2video.w = ist->st->codec->width  = ist->resample_width  = w;
 609     ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
 610
 611     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 612        palettes for all rectangles are identical or compatible */
 613     ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 614
 615     ist->sub2video.frame = av_frame_alloc();
 616     if (!ist->sub2video.frame)
 617         return AVERROR(ENOMEM);
 618     return 0;
 619 }
 620
 621 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 622                                         AVFilterInOut *in)
 623 {
 624     AVFilterContext *last_filter;
 625     const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
 626     InputStream *ist = ifilter->ist;
 627     InputFile     *f = input_files[ist->file_index];
 628     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 629                                          ist->st->time_base;
 630     AVRational fr = ist->framerate;
 631     AVRational sar;
 632     AVBPrint args;
 633     char name[255];
 634     int ret, pad_idx = 0;
 635
 636     if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
 637         av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
 638         return AVERROR(EINVAL);
 639     }
 640
 641     if (!fr.num)
 642         fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
 643
 644     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 645         ret = sub2video_prepare(ist);
 646         if (ret < 0)
 647             return ret;
 648     }
 649
 650     sar = ist->st->sample_aspect_ratio.num ?
 651           ist->st->sample_aspect_ratio :
 652           ist->st->codec->sample_aspect_ratio;
 653     if(!sar.den)
 654         sar = (AVRational){0,1};
 655     av_bprint_init(&args, 0, 1);
 656     av_bprintf(&args,
 657              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 658              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
 659              ist->resample_height,
 660              ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
 661              tb.num, tb.den, sar.num, sar.den,
 662              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 663     if (fr.num && fr.den)
 664         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 665     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 666              ist->file_index, ist->st->index);
 667
 668     if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
 669                                             args.str, NULL, fg->graph)) < 0)
 670         return ret;
 671     last_filter = ifilter->filter;
 672
 673     if (ist->framerate.num) {
 674         AVFilterContext *setpts;
 675
 676         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 677                  ist->file_index, ist->st->index);
 678         if ((ret = avfilter_graph_create_filter(&setpts,
 679                                                 avfilter_get_by_name("setpts"),
 680                                                 name, "N", NULL,
 681                                                 fg->graph)) < 0)
 682             return ret;
 683
 684         if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
 685             return ret;
 686
 687         last_filter = setpts;
 688     }
 689
 690     if (do_deinterlace) {
 691         AVFilterContext *yadif;
 692
 693         snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
 694                  ist->file_index, ist->st->index);
 695         if ((ret = avfilter_graph_create_filter(&yadif,
 696                                                 avfilter_get_by_name("yadif"),
 697                                                 name, "", NULL,
 698                                                 fg->graph)) < 0)
 699             return ret;
 700
 701         if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
 702             return ret;
 703
 704         last_filter = yadif;
 705     }
 706
 707     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 708              ist->file_index, ist->st->index);
 709     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 710                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 711     if (ret < 0)
 712         return ret;
 713
 714     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 715         return ret;
 716     return 0;
 717 }
 718
 719 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 720                                         AVFilterInOut *in)
 721 {
 722     AVFilterContext *last_filter;
 723     const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
 724     InputStream *ist = ifilter->ist;
 725     InputFile     *f = input_files[ist->file_index];
 726     AVBPrint args;
 727     char name[255];
 728     int ret, pad_idx = 0;
 729
 730     if (ist->st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
 731         av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
 732         return AVERROR(EINVAL);
 733     }
 734
 735     av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
 736     av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
 737              1, ist->st->codec->sample_rate,
 738              ist->st->codec->sample_rate,
 739              av_get_sample_fmt_name(ist->st->codec->sample_fmt));
 740     if (ist->st->codec->channel_layout)
 741         av_bprintf(&args, ":channel_layout=0x%"PRIx64,
 742                    ist->st->codec->channel_layout);
 743     else
 744         av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
 745     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 746              ist->file_index, ist->st->index);
 747
 748     if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
 749                                             name, args.str, NULL,
 750                                             fg->graph)) < 0)
 751         return ret;
 752     last_filter = ifilter->filter;
 753
 754 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 755     AVFilterContext *filt_ctx;                                              \
 756                                                                             \
 757     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 758            "similarly to -af " filter_name "=%s.\n", arg);                  \
 759                                                                             \
 760     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 761                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 762     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 763                                        avfilter_get_by_name(filter_name),   \
 764                                        name, arg, NULL, fg->graph);         \
 765     if (ret < 0)                                                            \
 766         return ret;                                                         \
 767                                                                             \
 768     ret = avfilter_link(last_filter, 0, filt_ctx, 0);                       \
 769     if (ret < 0)                                                            \
 770         return ret;                                                         \
 771                                                                             \
 772     last_filter = filt_ctx;                                                 \
 773 } while (0)
 774
 775     if (audio_sync_method > 0) {
 776         char args[256] = {0};
 777
 778         av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
 779         if (audio_drift_threshold != 0.1)
 780             av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
 781         if (!fg->reconfiguration)
 782             av_strlcatf(args, sizeof(args), ":first_pts=0");
 783         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 784     }
 785
 786 //     if (ost->audio_channels_mapped) {
 787 //         int i;
 788 //         AVBPrint pan_buf;
 789 //         av_bprint_init(&pan_buf, 256, 8192);
 790 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 791 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 792 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 793 //             if (ost->audio_channels_map[i] != -1)
 794 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 795 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 796 //         av_bprint_finalize(&pan_buf, NULL);
 797 //     }
 798
 799     if (audio_volume != 256) {
 800         char args[256];
 801
 802         av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
 803                "audio filter instead.\n");
 804
 805         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 806         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 807     }
 808
 809     snprintf(name, sizeof(name), "trim for input stream %d:%d",
 810              ist->file_index, ist->st->index);
 811     ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
 812                       AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
 813     if (ret < 0)
 814         return ret;
 815
 816     if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
 817         return ret;
 818
 819     return 0;
 820 }
 821
 822 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 823                                   AVFilterInOut *in)
 824 {
 825     av_freep(&ifilter->name);
 826     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 827
 828     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 829     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 830     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 831     default: av_assert0(0);
 832     }
 833 }
 834
 835 int configure_filtergraph(FilterGraph *fg)
 836 {
 837     AVFilterInOut *inputs, *outputs, *cur;
 838     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 839     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 840                                       fg->graph_desc;
 841
 842     avfilter_graph_free(&fg->graph);
 843     if (!(fg->graph = avfilter_graph_alloc()))
 844         return AVERROR(ENOMEM);
 845
 846     if (simple) {
 847         OutputStream *ost = fg->outputs[0]->ost;
 848         char args[512];
 849         AVDictionaryEntry *e = NULL;
 850
 851         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 852         fg->graph->scale_sws_opts = av_strdup(args);
 853
 854         args[0] = 0;
 855         while ((e = av_dict_get(ost->swr_opts, "", e,
 856                                 AV_DICT_IGNORE_SUFFIX))) {
 857             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 858         }
 859         if (strlen(args))
 860             args[strlen(args)-1] = 0;
 861         av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
 862
 863         args[0] = '\0';
 864         while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
 865                                 AV_DICT_IGNORE_SUFFIX))) {
 866             av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
 867         }
 868         if (strlen(args))
 869             args[strlen(args) - 1] = '\0';
 870         fg->graph->resample_lavr_opts = av_strdup(args);
 871
 872         e = av_dict_get(ost->opts, "threads", NULL, 0);
 873         if (e)
 874             av_opt_set(fg->graph, "threads", e->value, 0);
 875     }
 876
 877     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 878         return ret;
 879
 880     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 881         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 882                "exactly one input and output.\n", graph_desc);
 883         return AVERROR(EINVAL);
 884     }
 885
 886     for (cur = inputs; !simple && init && cur; cur = cur->next)
 887         init_input_filter(fg, cur);
 888
 889     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 890         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 891             return ret;
 892     avfilter_inout_free(&inputs);
 893
 894     if (!init || simple) {
 895         /* we already know the mappings between lavfi outputs and output streams,
 896          * so we can finish the setup */
 897         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 898             configure_output_filter(fg, fg->outputs[i], cur);
 899         avfilter_inout_free(&outputs);
 900
 901         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 902             return ret;
 903     } else {
 904         /* wait until output mappings are processed */
 905         for (cur = outputs; cur;) {
 906             GROW_ARRAY(fg->outputs, fg->nb_outputs);
 907             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 908                 exit_program(1);
 909             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 910             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 911             cur = cur->next;
 912             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 913         }
 914     }
 915
 916     fg->reconfiguration = 1;
 917     return 0;
 918 }
 919
 920 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 921 {
 922     int i;
 923     for (i = 0; i < fg->nb_inputs; i++)
 924         if (fg->inputs[i]->ist == ist)
 925             return 1;
 926     return 0;
 927 }
 928