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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 "ffmpeg.h"
  22
  23 #include "libavfilter/avfilter.h"
  24 #include "libavfilter/avfiltergraph.h"
  25 #include "libavfilter/buffersink.h"
  26
  27 #include "libavutil/audioconvert.h"
  28 #include "libavutil/avassert.h"
  29 #include "libavutil/avstring.h"
  30 #include "libavutil/bprint.h"
  31 #include "libavutil/pixdesc.h"
  32 #include "libavutil/pixfmt.h"
  33 #include "libavutil/imgutils.h"
  34 #include "libavutil/samplefmt.h"
  35
  36 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
  37 {
  38     if (codec && codec->pix_fmts) {
  39         const enum AVPixelFormat *p = codec->pix_fmts;
  40         int has_alpha= av_pix_fmt_descriptors[target].nb_components % 2 == 0;
  41         enum AVPixelFormat best= AV_PIX_FMT_NONE;
  42         if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
  43             if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
  44                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
  45             } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
  46                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
  47                                                  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
  48             }
  49         }
  50         for (; *p != AV_PIX_FMT_NONE; p++) {
  51             best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
  52             if (*p == target)
  53                 break;
  54         }
  55         if (*p == AV_PIX_FMT_NONE) {
  56             if (target != AV_PIX_FMT_NONE)
  57                 av_log(NULL, AV_LOG_WARNING,
  58                        "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
  59                        av_pix_fmt_descriptors[target].name,
  60                        codec->name,
  61                        av_pix_fmt_descriptors[best].name);
  62             return best;
  63         }
  64     }
  65     return target;
  66 }
  67
  68 void choose_sample_fmt(AVStream *st, AVCodec *codec)
  69 {
  70     if (codec && codec->sample_fmts) {
  71         const enum AVSampleFormat *p = codec->sample_fmts;
  72         for (; *p != -1; p++) {
  73             if (*p == st->codec->sample_fmt)
  74                 break;
  75         }
  76         if (*p == -1) {
  77             if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
  78                 av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
  79             if(av_get_sample_fmt_name(st->codec->sample_fmt))
  80             av_log(NULL, AV_LOG_WARNING,
  81                    "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
  82                    av_get_sample_fmt_name(st->codec->sample_fmt),
  83                    codec->name,
  84                    av_get_sample_fmt_name(codec->sample_fmts[0]));
  85             st->codec->sample_fmt = codec->sample_fmts[0];
  86         }
  87     }
  88 }
  89
  90 static char *choose_pix_fmts(OutputStream *ost)
  91 {
  92      if (ost->keep_pix_fmt) {
  93         if (ost->filter)
  94             avfilter_graph_set_auto_convert(ost->filter->graph->graph,
  95                                             AVFILTER_AUTO_CONVERT_NONE);
  96         if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
  97             return NULL;
  98         return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
  99     }
 100     if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
 101         return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
 102     } else if (ost->enc && ost->enc->pix_fmts) {
 103         const enum AVPixelFormat *p;
 104         AVIOContext *s = NULL;
 105         uint8_t *ret;
 106         int len;
 107
 108         if (avio_open_dyn_buf(&s) < 0)
 109             exit(1);
 110
 111         p = ost->enc->pix_fmts;
 112         if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
 113             if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
 114                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
 115             } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
 116                 p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
 117                                                     AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
 118             }
 119         }
 120
 121         for (; *p != AV_PIX_FMT_NONE; p++) {
 122             const char *name = av_get_pix_fmt_name(*p);
 123             avio_printf(s, "%s:", name);
 124         }
 125         len = avio_close_dyn_buf(s, &ret);
 126         ret[len - 1] = 0;
 127         return ret;
 128     } else
 129         return NULL;
 130 }
 131
 132 /* Define a function for building a string containing a list of
 133  * allowed formats. */
 134 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
 135 static char *choose_ ## var ## s(OutputStream *ost)                            \
 136 {                                                                              \
 137     if (ost->st->codec->var != none) {                                         \
 138         get_name(ost->st->codec->var);                                         \
 139         return av_strdup(name);                                                \
 140     } else if (ost->enc->supported_list) {                                     \
 141         const type *p;                                                         \
 142         AVIOContext *s = NULL;                                                 \
 143         uint8_t *ret;                                                          \
 144         int len;                                                               \
 145                                                                                \
 146         if (avio_open_dyn_buf(&s) < 0)                                         \
 147             exit(1);                                                           \
 148                                                                                \
 149         for (p = ost->enc->supported_list; *p != none; p++) {                  \
 150             get_name(*p);                                                      \
 151             avio_printf(s, "%s" separator, name);                              \
 152         }                                                                      \
 153         len = avio_close_dyn_buf(s, &ret);                                     \
 154         ret[len - 1] = 0;                                                      \
 155         return ret;                                                            \
 156     } else                                                                     \
 157         return NULL;                                                           \
 158 }
 159
 160 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
 161 //                   GET_PIX_FMT_NAME, ":")
 162
 163 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
 164                   AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
 165
 166 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
 167                   GET_SAMPLE_RATE_NAME, ",")
 168
 169 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
 170                   GET_CH_LAYOUT_NAME, ",")
 171
 172 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
 173 {
 174     FilterGraph *fg = av_mallocz(sizeof(*fg));
 175
 176     if (!fg)
 177         exit(1);
 178     fg->index = nb_filtergraphs;
 179
 180     fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs), &fg->nb_outputs,
 181                              fg->nb_outputs + 1);
 182     if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
 183         exit(1);
 184     fg->outputs[0]->ost   = ost;
 185     fg->outputs[0]->graph = fg;
 186
 187     ost->filter = fg->outputs[0];
 188
 189     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs), &fg->nb_inputs,
 190                             fg->nb_inputs + 1);
 191     if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
 192         exit(1);
 193     fg->inputs[0]->ist   = ist;
 194     fg->inputs[0]->graph = fg;
 195
 196     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 197                               &ist->nb_filters, ist->nb_filters + 1);
 198     ist->filters[ist->nb_filters - 1] = fg->inputs[0];
 199
 200     filtergraphs = grow_array(filtergraphs, sizeof(*filtergraphs),
 201                               &nb_filtergraphs, nb_filtergraphs + 1);
 202     filtergraphs[nb_filtergraphs - 1] = fg;
 203
 204     return fg;
 205 }
 206
 207 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 208 {
 209     InputStream *ist = NULL;
 210     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
 211     int i;
 212
 213     // TODO: support other filter types
 214     if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
 215         av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
 216                "currently.\n");
 217         exit(1);
 218     }
 219
 220     if (in->name) {
 221         AVFormatContext *s;
 222         AVStream       *st = NULL;
 223         char *p;
 224         int file_idx = strtol(in->name, &p, 0);
 225
 226         if (file_idx < 0 || file_idx >= nb_input_files) {
 227             av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
 228                    file_idx, fg->graph_desc);
 229             exit(1);
 230         }
 231         s = input_files[file_idx]->ctx;
 232
 233         for (i = 0; i < s->nb_streams; i++) {
 234             enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
 235             if (stream_type != type &&
 236                 !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
 237                   type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
 238                 continue;
 239             if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
 240                 st = s->streams[i];
 241                 break;
 242             }
 243         }
 244         if (!st) {
 245             av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
 246                    "matches no streams.\n", p, fg->graph_desc);
 247             exit(1);
 248         }
 249         ist = input_streams[input_files[file_idx]->ist_index + st->index];
 250     } else {
 251         /* find the first unused stream of corresponding type */
 252         for (i = 0; i < nb_input_streams; i++) {
 253             ist = input_streams[i];
 254             if (ist->st->codec->codec_type == type && ist->discard)
 255                 break;
 256         }
 257         if (i == nb_input_streams) {
 258             av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
 259                    "unlabeled input pad %d on filter %s\n", in->pad_idx,
 260                    in->filter_ctx->name);
 261             exit(1);
 262         }
 263     }
 264     av_assert0(ist);
 265
 266     ist->discard         = 0;
 267     ist->decoding_needed++;
 268     ist->st->discard = AVDISCARD_NONE;
 269
 270     fg->inputs = grow_array(fg->inputs, sizeof(*fg->inputs),
 271                             &fg->nb_inputs, fg->nb_inputs + 1);
 272     if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
 273         exit(1);
 274     fg->inputs[fg->nb_inputs - 1]->ist   = ist;
 275     fg->inputs[fg->nb_inputs - 1]->graph = fg;
 276
 277     ist->filters = grow_array(ist->filters, sizeof(*ist->filters),
 278                               &ist->nb_filters, ist->nb_filters + 1);
 279     ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
 280 }
 281
 282 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 283 {
 284     char *pix_fmts;
 285     OutputStream *ost = ofilter->ost;
 286     AVCodecContext *codec = ost->st->codec;
 287     AVFilterContext *last_filter = out->filter_ctx;
 288     int pad_idx = out->pad_idx;
 289     int ret;
 290     char name[255];
 291     AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
 292
 293     snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
 294     ret = avfilter_graph_create_filter(&ofilter->filter,
 295                                        avfilter_get_by_name("ffbuffersink"),
 296                                        name, NULL, NULL, fg->graph);
 297     av_freep(&buffersink_params);
 298
 299     if (ret < 0)
 300         return ret;
 301
 302     if (codec->width || codec->height) {
 303         char args[255];
 304         AVFilterContext *filter;
 305
 306         snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
 307                  codec->width,
 308                  codec->height,
 309                  (unsigned)ost->sws_flags);
 310         snprintf(name, sizeof(name), "scaler for output stream %d:%d",
 311                  ost->file_index, ost->index);
 312         if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
 313                                                 name, args, NULL, fg->graph)) < 0)
 314             return ret;
 315         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 316             return ret;
 317
 318         last_filter = filter;
 319         pad_idx = 0;
 320     }
 321
 322     if ((pix_fmts = choose_pix_fmts(ost))) {
 323         AVFilterContext *filter;
 324         snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
 325                  ost->file_index, ost->index);
 326         if ((ret = avfilter_graph_create_filter(&filter,
 327                                                 avfilter_get_by_name("format"),
 328                                                 "format", pix_fmts, NULL,
 329                                                 fg->graph)) < 0)
 330             return ret;
 331         if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
 332             return ret;
 333
 334         last_filter = filter;
 335         pad_idx     = 0;
 336         av_freep(&pix_fmts);
 337     }
 338
 339     if (ost->frame_rate.num && 0) {
 340         AVFilterContext *fps;
 341         char args[255];
 342
 343         snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
 344                  ost->frame_rate.den);
 345         snprintf(name, sizeof(name), "fps for output stream %d:%d",
 346                  ost->file_index, ost->index);
 347         ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
 348                                            name, args, NULL, fg->graph);
 349         if (ret < 0)
 350             return ret;
 351
 352         ret = avfilter_link(last_filter, pad_idx, fps, 0);
 353         if (ret < 0)
 354             return ret;
 355         last_filter = fps;
 356         pad_idx = 0;
 357     }
 358
 359     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 360         return ret;
 361
 362     return 0;
 363 }
 364
 365 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 366 {
 367     OutputStream *ost = ofilter->ost;
 368     AVCodecContext *codec  = ost->st->codec;
 369     AVFilterContext *last_filter = out->filter_ctx;
 370     int pad_idx = out->pad_idx;
 371     char *sample_fmts, *sample_rates, *channel_layouts;
 372     char name[255];
 373     int ret;
 374
 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("ffabuffersink"),
 379                                        name, NULL, NULL, fg->graph);
 380     if (ret < 0)
 381         return ret;
 382
 383 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do {                 \
 384     AVFilterContext *filt_ctx;                                              \
 385                                                                             \
 386     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 387            "similarly to -af " filter_name "=%s.\n", arg);                  \
 388                                                                             \
 389     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 390                                        avfilter_get_by_name(filter_name),   \
 391                                        filter_name, arg, NULL, fg->graph);  \
 392     if (ret < 0)                                                            \
 393         return ret;                                                         \
 394                                                                             \
 395     ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0);                 \
 396     if (ret < 0)                                                            \
 397         return ret;                                                         \
 398                                                                             \
 399     last_filter = filt_ctx;                                                 \
 400     pad_idx = 0;                                                            \
 401 } while (0)
 402     if (ost->audio_channels_mapped) {
 403         int i;
 404         AVBPrint pan_buf;
 405         av_bprint_init(&pan_buf, 256, 8192);
 406         av_bprintf(&pan_buf, "0x%"PRIx64,
 407                    av_get_default_channel_layout(ost->audio_channels_mapped));
 408         for (i = 0; i < ost->audio_channels_mapped; i++)
 409             if (ost->audio_channels_map[i] != -1)
 410                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 411
 412         AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
 413         av_bprint_finalize(&pan_buf, NULL);
 414     }
 415
 416     if (codec->channels && !codec->channel_layout)
 417         codec->channel_layout = av_get_default_channel_layout(codec->channels);
 418
 419     sample_fmts     = choose_sample_fmts(ost);
 420     sample_rates    = choose_sample_rates(ost);
 421     channel_layouts = choose_channel_layouts(ost);
 422     if (sample_fmts || sample_rates || channel_layouts) {
 423         AVFilterContext *format;
 424         char args[256];
 425         args[0] = 0;
 426
 427         if (sample_fmts)
 428             av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
 429                             sample_fmts);
 430         if (sample_rates)
 431             av_strlcatf(args, sizeof(args), "sample_rates=%s:",
 432                             sample_rates);
 433         if (channel_layouts)
 434             av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
 435                             channel_layouts);
 436
 437         av_freep(&sample_fmts);
 438         av_freep(&sample_rates);
 439         av_freep(&channel_layouts);
 440
 441         snprintf(name, sizeof(name), "audio format for output stream %d:%d",
 442                  ost->file_index, ost->index);
 443         ret = avfilter_graph_create_filter(&format,
 444                                            avfilter_get_by_name("aformat"),
 445                                            name, args, NULL, fg->graph);
 446         if (ret < 0)
 447             return ret;
 448
 449         ret = avfilter_link(last_filter, pad_idx, format, 0);
 450         if (ret < 0)
 451             return ret;
 452
 453         last_filter = format;
 454         pad_idx = 0;
 455     }
 456
 457     if (audio_volume != 256 && 0) {
 458         char args[256];
 459
 460         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 461         AUTO_INSERT_FILTER("-vol", "volume", args);
 462     }
 463
 464     if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
 465         return ret;
 466
 467     return 0;
 468 }
 469
 470 #define DESCRIBE_FILTER_LINK(f, inout, in)                         \
 471 {                                                                  \
 472     AVFilterContext *ctx = inout->filter_ctx;                      \
 473     AVFilterPad *pads = in ? ctx->input_pads  : ctx->output_pads;  \
 474     int       nb_pads = in ? ctx->input_count : ctx->output_count; \
 475     AVIOContext *pb;                                               \
 476                                                                    \
 477     if (avio_open_dyn_buf(&pb) < 0)                                \
 478         exit(1);                                                   \
 479                                                                    \
 480     avio_printf(pb, "%s", ctx->filter->name);                      \
 481     if (nb_pads > 1)                                               \
 482         avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
 483     avio_w8(pb, 0);                                                \
 484     avio_close_dyn_buf(pb, &f->name);                              \
 485 }
 486
 487 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
 488 {
 489     av_freep(&ofilter->name);
 490     DESCRIBE_FILTER_LINK(ofilter, out, 0);
 491
 492     switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
 493     case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
 494     case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
 495     default: av_assert0(0);
 496     }
 497 }
 498
 499 static int sub2video_prepare(InputStream *ist)
 500 {
 501     AVFormatContext *avf = input_files[ist->file_index]->ctx;
 502     int i, ret, w, h;
 503     uint8_t *image[4];
 504     int linesize[4];
 505
 506     /* Compute the size of the canvas for the subtitles stream.
 507        If the subtitles codec has set a size, use it. Otherwise use the
 508        maximum dimensions of the video streams in the same file. */
 509     w = ist->st->codec->width;
 510     h = ist->st->codec->height;
 511     if (!(w && h)) {
 512         for (i = 0; i < avf->nb_streams; i++) {
 513             if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
 514                 w = FFMAX(w, avf->streams[i]->codec->width);
 515                 h = FFMAX(h, avf->streams[i]->codec->height);
 516             }
 517         }
 518         if (!(w && h)) {
 519             w = FFMAX(w, 720);
 520             h = FFMAX(h, 576);
 521         }
 522         av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
 523     }
 524     ist->sub2video.w = ist->st->codec->width  = w;
 525     ist->sub2video.h = ist->st->codec->height = h;
 526
 527     /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
 528        palettes for all rectangles are identical or compatible */
 529     ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
 530
 531     ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
 532     if (ret < 0)
 533         return ret;
 534     memset(image[0], 0, h * linesize[0]);
 535     ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
 536             image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
 537             w, h, AV_PIX_FMT_RGB32);
 538     if (!ist->sub2video.ref) {
 539         av_free(image[0]);
 540         return AVERROR(ENOMEM);
 541     }
 542     return 0;
 543 }
 544
 545 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
 546                                         AVFilterInOut *in)
 547 {
 548     AVFilterContext *first_filter = in->filter_ctx;
 549     AVFilter *filter = avfilter_get_by_name("buffer");
 550     InputStream *ist = ifilter->ist;
 551     AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
 552                                          ist->st->time_base;
 553     AVRational fr = ist->framerate.num ? ist->framerate :
 554                                          ist->st->r_frame_rate;
 555     AVRational sar;
 556     AVBPrint args;
 557     char name[255];
 558     int pad_idx = in->pad_idx;
 559     int ret;
 560
 561     if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
 562         ret = sub2video_prepare(ist);
 563         if (ret < 0)
 564             return ret;
 565     }
 566
 567     sar = ist->st->sample_aspect_ratio.num ?
 568           ist->st->sample_aspect_ratio :
 569           ist->st->codec->sample_aspect_ratio;
 570     if(!sar.den)
 571         sar = (AVRational){0,1};
 572     av_bprint_init(&args, 0, 1);
 573     av_bprintf(&args,
 574              "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
 575              "pixel_aspect=%d/%d:sws_param=flags=%d", ist->st->codec->width,
 576              ist->st->codec->height, ist->st->codec->pix_fmt,
 577              tb.num, tb.den, sar.num, sar.den,
 578              SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
 579     if (fr.num && fr.den)
 580         av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
 581     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 582              ist->file_index, ist->st->index);
 583
 584     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
 585                                             args.str, NULL, fg->graph)) < 0)
 586         return ret;
 587
 588     if (ist->framerate.num) {
 589         AVFilterContext *setpts;
 590
 591         snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
 592                  ist->file_index, ist->st->index);
 593         if ((ret = avfilter_graph_create_filter(&setpts,
 594                                                 avfilter_get_by_name("setpts"),
 595                                                 name, "N", NULL,
 596                                                 fg->graph)) < 0)
 597             return ret;
 598
 599         if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
 600             return ret;
 601
 602         first_filter = setpts;
 603         pad_idx = 0;
 604     }
 605
 606     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 607         return ret;
 608     return 0;
 609 }
 610
 611 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
 612                                         AVFilterInOut *in)
 613 {
 614     AVFilterContext *first_filter = in->filter_ctx;
 615     AVFilter *filter = avfilter_get_by_name("abuffer");
 616     InputStream *ist = ifilter->ist;
 617     int pad_idx = in->pad_idx;
 618     char args[255], name[255];
 619     int ret;
 620
 621     snprintf(args, sizeof(args), "time_base=%d/%d:sample_rate=%d:sample_fmt=%s"
 622              ":channel_layout=0x%"PRIx64,
 623              1, ist->st->codec->sample_rate,
 624              ist->st->codec->sample_rate,
 625              av_get_sample_fmt_name(ist->st->codec->sample_fmt),
 626              ist->st->codec->channel_layout);
 627     snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
 628              ist->file_index, ist->st->index);
 629
 630     if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
 631                                             name, args, NULL,
 632                                             fg->graph)) < 0)
 633         return ret;
 634
 635 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do {                 \
 636     AVFilterContext *filt_ctx;                                              \
 637                                                                             \
 638     av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi "            \
 639            "similarly to -af " filter_name "=%s.\n", arg);                  \
 640                                                                             \
 641     snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d",      \
 642                 fg->index, filter_name, ist->file_index, ist->st->index);   \
 643     ret = avfilter_graph_create_filter(&filt_ctx,                           \
 644                                        avfilter_get_by_name(filter_name),   \
 645                                        name, arg, NULL, fg->graph);         \
 646     if (ret < 0)                                                            \
 647         return ret;                                                         \
 648                                                                             \
 649     ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx);                \
 650     if (ret < 0)                                                            \
 651         return ret;                                                         \
 652                                                                             \
 653     first_filter = filt_ctx;                                                  \
 654 } while (0)
 655
 656     if (audio_sync_method > 0) {
 657         char args[256] = {0};
 658
 659         av_strlcatf(args, sizeof(args), "min_comp=0.001:min_hard_comp=%f", audio_drift_threshold);
 660         if (audio_sync_method > 1)
 661             av_strlcatf(args, sizeof(args), ":max_soft_comp=%f", audio_sync_method/(double)ist->st->codec->sample_rate);
 662         AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
 663     }
 664
 665 //     if (ost->audio_channels_mapped) {
 666 //         int i;
 667 //         AVBPrint pan_buf;
 668 //         av_bprint_init(&pan_buf, 256, 8192);
 669 //         av_bprintf(&pan_buf, "0x%"PRIx64,
 670 //                    av_get_default_channel_layout(ost->audio_channels_mapped));
 671 //         for (i = 0; i < ost->audio_channels_mapped; i++)
 672 //             if (ost->audio_channels_map[i] != -1)
 673 //                 av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
 674 //         AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
 675 //         av_bprint_finalize(&pan_buf, NULL);
 676 //     }
 677
 678     if (audio_volume != 256) {
 679         char args[256];
 680
 681         snprintf(args, sizeof(args), "%f", audio_volume / 256.);
 682         AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
 683     }
 684     if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
 685         return ret;
 686
 687     return 0;
 688 }
 689
 690 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
 691                                   AVFilterInOut *in)
 692 {
 693     av_freep(&ifilter->name);
 694     DESCRIBE_FILTER_LINK(ifilter, in, 1);
 695
 696     switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
 697     case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
 698     case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
 699     default: av_assert0(0);
 700     }
 701 }
 702
 703 int configure_filtergraph(FilterGraph *fg)
 704 {
 705     AVFilterInOut *inputs, *outputs, *cur;
 706     int ret, i, init = !fg->graph, simple = !fg->graph_desc;
 707     const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
 708                                       fg->graph_desc;
 709
 710     avfilter_graph_free(&fg->graph);
 711     if (!(fg->graph = avfilter_graph_alloc()))
 712         return AVERROR(ENOMEM);
 713
 714     if (simple) {
 715         OutputStream *ost = fg->outputs[0]->ost;
 716         char args[255];
 717         snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
 718         fg->graph->scale_sws_opts = av_strdup(args);
 719     }
 720
 721     if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
 722         return ret;
 723
 724     if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
 725         av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
 726                "exactly one input and output.\n", graph_desc);
 727         return AVERROR(EINVAL);
 728     }
 729
 730     for (cur = inputs; !simple && init && cur; cur = cur->next)
 731         init_input_filter(fg, cur);
 732
 733     for (cur = inputs, i = 0; cur; cur = cur->next, i++)
 734         if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
 735             return ret;
 736     avfilter_inout_free(&inputs);
 737
 738     if (!init || simple) {
 739         /* we already know the mappings between lavfi outputs and output streams,
 740          * so we can finish the setup */
 741         for (cur = outputs, i = 0; cur; cur = cur->next, i++)
 742             configure_output_filter(fg, fg->outputs[i], cur);
 743         avfilter_inout_free(&outputs);
 744
 745         if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
 746             return ret;
 747     } else {
 748         /* wait until output mappings are processed */
 749         for (cur = outputs; cur;) {
 750             fg->outputs = grow_array(fg->outputs, sizeof(*fg->outputs),
 751                                      &fg->nb_outputs, fg->nb_outputs + 1);
 752             if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
 753                 exit(1);
 754             fg->outputs[fg->nb_outputs - 1]->graph   = fg;
 755             fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
 756             cur = cur->next;
 757             fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
 758         }
 759     }
 760
 761     return 0;
 762 }
 763
 764 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
 765 {
 766     int i;
 767     for (i = 0; i < fg->nb_inputs; i++)
 768         if (fg->inputs[i]->ist == ist)
 769             return 1;
 770     return 0;
 771 }
 772