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