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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 "ffmpeg.h"
22 
23 #include "libavfilter/avfilter.h"
24 #include "libavfilter/buffersink.h"
25 
26 #include "libavresample/avresample.h"
27 
28 #include "libavutil/avassert.h"
29 #include "libavutil/avstring.h"
30 #include "libavutil/bprint.h"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/opt.h"
33 #include "libavutil/pixdesc.h"
34 #include "libavutil/pixfmt.h"
35 #include "libavutil/imgutils.h"
36 #include "libavutil/samplefmt.h"
37 
38 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
39 {
40  if (codec && codec->pix_fmts) {
41  const enum AVPixelFormat *p = codec->pix_fmts;
42  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
43  int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
44  enum AVPixelFormat best= AV_PIX_FMT_NONE;
45  if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
46  if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
47  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
48  } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
49  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
50  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
51  }
52  }
53  for (; *p != AV_PIX_FMT_NONE; p++) {
54  best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
55  if (*p == target)
56  break;
57  }
58  if (*p == AV_PIX_FMT_NONE) {
59  if (target != AV_PIX_FMT_NONE)
60  av_log(NULL, AV_LOG_WARNING,
61  "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
62  av_get_pix_fmt_name(target),
63  codec->name,
64  av_get_pix_fmt_name(best));
65  return best;
66  }
67  }
68  return target;
69 }
70 
71 void choose_sample_fmt(AVStream *st, AVCodec *codec)
72 {
73  if (codec && codec->sample_fmts) {
74  const enum AVSampleFormat *p = codec->sample_fmts;
75  for (; *p != -1; p++) {
76  if (*p == st->codec->sample_fmt)
77  break;
78  }
79  if (*p == -1) {
80  if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
81  av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
82  if(av_get_sample_fmt_name(st->codec->sample_fmt))
83  av_log(NULL, AV_LOG_WARNING,
84  "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
85  av_get_sample_fmt_name(st->codec->sample_fmt),
86  codec->name,
87  av_get_sample_fmt_name(codec->sample_fmts[0]));
88  st->codec->sample_fmt = codec->sample_fmts[0];
89  }
90  }
91 }
92 
93 static char *choose_pix_fmts(OutputStream *ost)
94 {
95  AVDictionaryEntry *strict_dict = av_dict_get(ost->opts, "strict", NULL, 0);
96  if (strict_dict)
97  // used by choose_pixel_fmt() and below
98  av_opt_set(ost->st->codec, "strict", strict_dict->value, 0);
99 
100  if (ost->keep_pix_fmt) {
101  if (ost->filter)
102  avfilter_graph_set_auto_convert(ost->filter->graph->graph,
103  AVFILTER_AUTO_CONVERT_NONE);
104  if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
105  return NULL;
106  return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
107  }
108  if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
109  return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
110  } else if (ost->enc && ost->enc->pix_fmts) {
111  const enum AVPixelFormat *p;
112  AVIOContext *s = NULL;
113  uint8_t *ret;
114  int len;
115 
116  if (avio_open_dyn_buf(&s) < 0)
117  exit_program(1);
118 
119  p = ost->enc->pix_fmts;
120  if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
121  if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
122  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
123  } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
124  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
125  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
126  }
127  }
128 
129  for (; *p != AV_PIX_FMT_NONE; p++) {
130  const char *name = av_get_pix_fmt_name(*p);
131  avio_printf(s, "%s|", name);
132  }
133  len = avio_close_dyn_buf(s, &ret);
134  ret[len - 1] = 0;
135  return ret;
136  } else
137  return NULL;
138 }
139 
140 /* Define a function for building a string containing a list of
141  * allowed formats. */
142 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name) \
143 static char *choose_ ## var ## s(OutputStream *ost) \
144 { \
145  if (ost->st->codec->var != none) { \
146  get_name(ost->st->codec->var); \
147  return av_strdup(name); \
148  } else if (ost->enc && ost->enc->supported_list) { \
149  const type *p; \
150  AVIOContext *s = NULL; \
151  uint8_t *ret; \
152  int len; \
153  \
154  if (avio_open_dyn_buf(&s) < 0) \
155  exit_program(1); \
156  \
157  for (p = ost->enc->supported_list; *p != none; p++) { \
158  get_name(*p); \
159  avio_printf(s, "%s|", name); \
160  } \
161  len = avio_close_dyn_buf(s, &ret); \
162  ret[len - 1] = 0; \
163  return ret; \
164  } else \
165  return NULL; \
166 }
167 
168 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
169 // GET_PIX_FMT_NAME)
170 
171 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
172  AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
173 
174 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
175  GET_SAMPLE_RATE_NAME)
176 
177 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
178  GET_CH_LAYOUT_NAME)
179 
180 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
181 {
182  FilterGraph *fg = av_mallocz(sizeof(*fg));
183 
184  if (!fg)
185  exit_program(1);
186  fg->index = nb_filtergraphs;
187 
188  GROW_ARRAY(fg->outputs, fg->nb_outputs);
189  if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
190  exit_program(1);
191  fg->outputs[0]->ost = ost;
192  fg->outputs[0]->graph = fg;
193 
194  ost->filter = fg->outputs[0];
195 
196  GROW_ARRAY(fg->inputs, fg->nb_inputs);
197  if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
198  exit_program(1);
199  fg->inputs[0]->ist = ist;
200  fg->inputs[0]->graph = fg;
201 
202  GROW_ARRAY(ist->filters, ist->nb_filters);
203  ist->filters[ist->nb_filters - 1] = fg->inputs[0];
204 
205  GROW_ARRAY(filtergraphs, nb_filtergraphs);
206  filtergraphs[nb_filtergraphs - 1] = fg;
207 
208  return fg;
209 }
210 
211 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
212 {
213  InputStream *ist = NULL;
214  enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
215  int i;
216 
217  // TODO: support other filter types
218  if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
219  av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
220  "currently.\n");
221  exit_program(1);
222  }
223 
224  if (in->name) {
225  AVFormatContext *s;
226  AVStream *st = NULL;
227  char *p;
228  int file_idx = strtol(in->name, &p, 0);
229 
230  if (file_idx < 0 || file_idx >= nb_input_files) {
231  av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
232  file_idx, fg->graph_desc);
233  exit_program(1);
234  }
235  s = input_files[file_idx]->ctx;
236 
237  for (i = 0; i < s->nb_streams; i++) {
238  enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
239  if (stream_type != type &&
240  !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
241  type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
242  continue;
243  if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
244  st = s->streams[i];
245  break;
246  }
247  }
248  if (!st) {
249  av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
250  "matches no streams.\n", p, fg->graph_desc);
251  exit_program(1);
252  }
253  ist = input_streams[input_files[file_idx]->ist_index + st->index];
254  } else {
255  /* find the first unused stream of corresponding type */
256  for (i = 0; i < nb_input_streams; i++) {
257  ist = input_streams[i];
258  if (ist->st->codec->codec_type == type && ist->discard)
259  break;
260  }
261  if (i == nb_input_streams) {
262  av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
263  "unlabeled input pad %d on filter %s\n", in->pad_idx,
264  in->filter_ctx->name);
265  exit_program(1);
266  }
267  }
268  av_assert0(ist);
269 
270  ist->discard = 0;
271  ist->decoding_needed++;
272  ist->st->discard = AVDISCARD_NONE;
273 
274  GROW_ARRAY(fg->inputs, fg->nb_inputs);
275  if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
276  exit_program(1);
277  fg->inputs[fg->nb_inputs - 1]->ist = ist;
278  fg->inputs[fg->nb_inputs - 1]->graph = fg;
279 
280  GROW_ARRAY(ist->filters, ist->nb_filters);
281  ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
282 }
283 
284 static int insert_trim(int64_t start_time, int64_t duration,
285  AVFilterContext **last_filter, int *pad_idx,
286  const char *filter_name)
287 {
288  AVFilterGraph *graph = (*last_filter)->graph;
289  AVFilterContext *ctx;
290  const AVFilter *trim;
291  enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
292  const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
293  int ret = 0;
294 
295  if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
296  return 0;
297 
298  trim = avfilter_get_by_name(name);
299  if (!trim) {
300  av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
301  "recording time.\n", name);
302  return AVERROR_FILTER_NOT_FOUND;
303  }
304 
305  ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
306  if (!ctx)
307  return AVERROR(ENOMEM);
308 
309  if (duration != INT64_MAX) {
310  ret = av_opt_set_int(ctx, "durationi", duration,
311  AV_OPT_SEARCH_CHILDREN);
312  }
313  if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
314  ret = av_opt_set_int(ctx, "starti", start_time,
315  AV_OPT_SEARCH_CHILDREN);
316  }
317  if (ret < 0) {
318  av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
319  return ret;
320  }
321 
322  ret = avfilter_init_str(ctx, NULL);
323  if (ret < 0)
324  return ret;
325 
326  ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
327  if (ret < 0)
328  return ret;
329 
330  *last_filter = ctx;
331  *pad_idx = 0;
332  return 0;
333 }
334 
335 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
336 {
337  char *pix_fmts;
338  OutputStream *ost = ofilter->ost;
339  OutputFile *of = output_files[ost->file_index];
340  AVCodecContext *codec = ost->st->codec;
341  AVFilterContext *last_filter = out->filter_ctx;
342  int pad_idx = out->pad_idx;
343  int ret;
344  char name[255];
345 
346  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
347  ret = avfilter_graph_create_filter(&ofilter->filter,
348  avfilter_get_by_name("buffersink"),
349  name, NULL, NULL, fg->graph);
350 
351  if (ret < 0)
352  return ret;
353 
354  if (codec->width || codec->height) {
355  char args[255];
356  AVFilterContext *filter;
357 
358  snprintf(args, sizeof(args), "%d:%d:0x%X",
359  codec->width,
360  codec->height,
361  (unsigned)ost->sws_flags);
362  snprintf(name, sizeof(name), "scaler for output stream %d:%d",
363  ost->file_index, ost->index);
364  if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
365  name, args, NULL, fg->graph)) < 0)
366  return ret;
367  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
368  return ret;
369 
370  last_filter = filter;
371  pad_idx = 0;
372  }
373 
374  if ((pix_fmts = choose_pix_fmts(ost))) {
375  AVFilterContext *filter;
376  snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
377  ost->file_index, ost->index);
378  ret = avfilter_graph_create_filter(&filter,
379  avfilter_get_by_name("format"),
380  "format", pix_fmts, NULL,
381  fg->graph);
382  av_freep(&pix_fmts);
383  if (ret < 0)
384  return ret;
385  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
386  return ret;
387 
388  last_filter = filter;
389  pad_idx = 0;
390  }
391 
392  if (ost->frame_rate.num && 0) {
393  AVFilterContext *fps;
394  char args[255];
395 
396  snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
397  ost->frame_rate.den);
398  snprintf(name, sizeof(name), "fps for output stream %d:%d",
399  ost->file_index, ost->index);
400  ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
401  name, args, NULL, fg->graph);
402  if (ret < 0)
403  return ret;
404 
405  ret = avfilter_link(last_filter, pad_idx, fps, 0);
406  if (ret < 0)
407  return ret;
408  last_filter = fps;
409  pad_idx = 0;
410  }
411 
412  snprintf(name, sizeof(name), "trim for output stream %d:%d",
413  ost->file_index, ost->index);
414  ret = insert_trim(of->start_time, of->recording_time,
415  &last_filter, &pad_idx, name);
416  if (ret < 0)
417  return ret;
418 
419 
420  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
421  return ret;
422 
423  return 0;
424 }
425 
426 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
427 {
428  OutputStream *ost = ofilter->ost;
429  OutputFile *of = output_files[ost->file_index];
430  AVCodecContext *codec = ost->st->codec;
431  AVFilterContext *last_filter = out->filter_ctx;
432  int pad_idx = out->pad_idx;
433  char *sample_fmts, *sample_rates, *channel_layouts;
434  char name[255];
435  int ret;
436 
437  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
438  ret = avfilter_graph_create_filter(&ofilter->filter,
439  avfilter_get_by_name("abuffersink"),
440  name, NULL, NULL, fg->graph);
441  if (ret < 0)
442  return ret;
443  if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
444  return ret;
445 
446 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
447  AVFilterContext *filt_ctx; \
448  \
449  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
450  "similarly to -af " filter_name "=%s.\n", arg); \
451  \
452  ret = avfilter_graph_create_filter(&filt_ctx, \
453  avfilter_get_by_name(filter_name), \
454  filter_name, arg, NULL, fg->graph); \
455  if (ret < 0) \
456  return ret; \
457  \
458  ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
459  if (ret < 0) \
460  return ret; \
461  \
462  last_filter = filt_ctx; \
463  pad_idx = 0; \
464 } while (0)
465  if (ost->audio_channels_mapped) {
466  int i;
467  AVBPrint pan_buf;
468  av_bprint_init(&pan_buf, 256, 8192);
469  av_bprintf(&pan_buf, "0x%"PRIx64,
470  av_get_default_channel_layout(ost->audio_channels_mapped));
471  for (i = 0; i < ost->audio_channels_mapped; i++)
472  if (ost->audio_channels_map[i] != -1)
473  av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
474 
475  AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
476  av_bprint_finalize(&pan_buf, NULL);
477  }
478 
479  if (codec->channels && !codec->channel_layout)
480  codec->channel_layout = av_get_default_channel_layout(codec->channels);
481 
482  sample_fmts = choose_sample_fmts(ost);
483  sample_rates = choose_sample_rates(ost);
484  channel_layouts = choose_channel_layouts(ost);
485  if (sample_fmts || sample_rates || channel_layouts) {
486  AVFilterContext *format;
487  char args[256];
488  args[0] = 0;
489 
490  if (sample_fmts)
491  av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
492  sample_fmts);
493  if (sample_rates)
494  av_strlcatf(args, sizeof(args), "sample_rates=%s:",
495  sample_rates);
496  if (channel_layouts)
497  av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
498  channel_layouts);
499 
500  av_freep(&sample_fmts);
501  av_freep(&sample_rates);
502  av_freep(&channel_layouts);
503 
504  snprintf(name, sizeof(name), "audio format for output stream %d:%d",
505  ost->file_index, ost->index);
506  ret = avfilter_graph_create_filter(&format,
507  avfilter_get_by_name("aformat"),
508  name, args, NULL, fg->graph);
509  if (ret < 0)
510  return ret;
511 
512  ret = avfilter_link(last_filter, pad_idx, format, 0);
513  if (ret < 0)
514  return ret;
515 
516  last_filter = format;
517  pad_idx = 0;
518  }
519 
520  if (audio_volume != 256 && 0) {
521  char args[256];
522 
523  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
524  AUTO_INSERT_FILTER("-vol", "volume", args);
525  }
526 
527  if (ost->apad && of->shortest) {
528  char args[256];
529  int i;
530 
531  for (i=0; i<of->ctx->nb_streams; i++)
532  if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
533  break;
534 
535  if (i<of->ctx->nb_streams) {
536  snprintf(args, sizeof(args), "%s", ost->apad);
537  AUTO_INSERT_FILTER("-apad", "apad", args);
538  }
539  }
540 
541  snprintf(name, sizeof(name), "trim for output stream %d:%d",
542  ost->file_index, ost->index);
543  ret = insert_trim(of->start_time, of->recording_time,
544  &last_filter, &pad_idx, name);
545  if (ret < 0)
546  return ret;
547 
548  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
549  return ret;
550 
551  return 0;
552 }
553 
554 #define DESCRIBE_FILTER_LINK(f, inout, in) \
555 { \
556  AVFilterContext *ctx = inout->filter_ctx; \
557  AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
558  int nb_pads = in ? ctx->nb_inputs : ctx->nb_outputs; \
559  AVIOContext *pb; \
560  \
561  if (avio_open_dyn_buf(&pb) < 0) \
562  exit_program(1); \
563  \
564  avio_printf(pb, "%s", ctx->filter->name); \
565  if (nb_pads > 1) \
566  avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
567  avio_w8(pb, 0); \
568  avio_close_dyn_buf(pb, &f->name); \
569 }
570 
571 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
572 {
573  av_freep(&ofilter->name);
574  DESCRIBE_FILTER_LINK(ofilter, out, 0);
575 
576  switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
577  case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
578  case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
579  default: av_assert0(0);
580  }
581 }
582 
583 static int sub2video_prepare(InputStream *ist)
584 {
585  AVFormatContext *avf = input_files[ist->file_index]->ctx;
586  int i, w, h;
587 
588  /* Compute the size of the canvas for the subtitles stream.
589  If the subtitles codec has set a size, use it. Otherwise use the
590  maximum dimensions of the video streams in the same file. */
591  w = ist->st->codec->width;
592  h = ist->st->codec->height;
593  if (!(w && h)) {
594  for (i = 0; i < avf->nb_streams; i++) {
595  if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
596  w = FFMAX(w, avf->streams[i]->codec->width);
597  h = FFMAX(h, avf->streams[i]->codec->height);
598  }
599  }
600  if (!(w && h)) {
601  w = FFMAX(w, 720);
602  h = FFMAX(h, 576);
603  }
604  av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
605  }
606  ist->sub2video.w = ist->st->codec->width = ist->resample_width = w;
607  ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
608 
609  /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
610  palettes for all rectangles are identical or compatible */
611  ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
612 
613  ist->sub2video.frame = av_frame_alloc();
614  if (!ist->sub2video.frame)
615  return AVERROR(ENOMEM);
616  return 0;
617 }
618 
619 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
620  AVFilterInOut *in)
621 {
622  AVFilterContext *last_filter;
623  const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
624  InputStream *ist = ifilter->ist;
625  InputFile *f = input_files[ist->file_index];
626  AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
627  ist->st->time_base;
628  AVRational fr = ist->framerate;
629  AVRational sar;
630  AVBPrint args;
631  char name[255];
632  int ret, pad_idx = 0;
633 
634  if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
635  av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
636  return AVERROR(EINVAL);
637  }
638 
639  if (!fr.num)
640  fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
641 
642  if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
643  ret = sub2video_prepare(ist);
644  if (ret < 0)
645  return ret;
646  }
647 
648  sar = ist->st->sample_aspect_ratio.num ?
649  ist->st->sample_aspect_ratio :
650  ist->st->codec->sample_aspect_ratio;
651  if(!sar.den)
652  sar = (AVRational){0,1};
653  av_bprint_init(&args, 0, 1);
654  av_bprintf(&args,
655  "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
656  "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
657  ist->resample_height, ist->resample_pix_fmt,
658  tb.num, tb.den, sar.num, sar.den,
659  SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
660  if (fr.num && fr.den)
661  av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
662  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
663  ist->file_index, ist->st->index);
664 
665  if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
666  args.str, NULL, fg->graph)) < 0)
667  return ret;
668  last_filter = ifilter->filter;
669 
670  if (ist->framerate.num) {
671  AVFilterContext *setpts;
672 
673  snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
674  ist->file_index, ist->st->index);
675  if ((ret = avfilter_graph_create_filter(&setpts,
676  avfilter_get_by_name("setpts"),
677  name, "N", NULL,
678  fg->graph)) < 0)
679  return ret;
680 
681  if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
682  return ret;
683 
684  last_filter = setpts;
685  }
686 
687  if (do_deinterlace) {
688  AVFilterContext *yadif;
689 
690  snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
691  ist->file_index, ist->st->index);
692  if ((ret = avfilter_graph_create_filter(&yadif,
693  avfilter_get_by_name("yadif"),
694  name, "", NULL,
695  fg->graph)) < 0)
696  return ret;
697 
698  if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
699  return ret;
700 
701  last_filter = yadif;
702  }
703 
704  snprintf(name, sizeof(name), "trim for input stream %d:%d",
705  ist->file_index, ist->st->index);
706  ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
707  AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
708  if (ret < 0)
709  return ret;
710 
711  if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
712  return ret;
713  return 0;
714 }
715 
716 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
717  AVFilterInOut *in)
718 {
719  AVFilterContext *last_filter;
720  const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
721  InputStream *ist = ifilter->ist;
722  InputFile *f = input_files[ist->file_index];
723  AVBPrint args;
724  char name[255];
725  int ret, pad_idx = 0;
726 
727  if (ist->st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
728  av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
729  return AVERROR(EINVAL);
730  }
731 
732  av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
733  av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
734  1, ist->st->codec->sample_rate,
735  ist->st->codec->sample_rate,
736  av_get_sample_fmt_name(ist->st->codec->sample_fmt));
737  if (ist->st->codec->channel_layout)
738  av_bprintf(&args, ":channel_layout=0x%"PRIx64,
739  ist->st->codec->channel_layout);
740  else
741  av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
742  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
743  ist->file_index, ist->st->index);
744 
745  if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
746  name, args.str, NULL,
747  fg->graph)) < 0)
748  return ret;
749  last_filter = ifilter->filter;
750 
751 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
752  AVFilterContext *filt_ctx; \
753  \
754  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
755  "similarly to -af " filter_name "=%s.\n", arg); \
756  \
757  snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
758  fg->index, filter_name, ist->file_index, ist->st->index); \
759  ret = avfilter_graph_create_filter(&filt_ctx, \
760  avfilter_get_by_name(filter_name), \
761  name, arg, NULL, fg->graph); \
762  if (ret < 0) \
763  return ret; \
764  \
765  ret = avfilter_link(last_filter, 0, filt_ctx, 0); \
766  if (ret < 0) \
767  return ret; \
768  \
769  last_filter = filt_ctx; \
770 } while (0)
771 
772  if (audio_sync_method > 0) {
773  char args[256] = {0};
774 
775  av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
776  if (audio_drift_threshold != 0.1)
777  av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
778  if (!fg->reconfiguration)
779  av_strlcatf(args, sizeof(args), ":first_pts=0");
780  AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
781  }
782 
783 // if (ost->audio_channels_mapped) {
784 // int i;
785 // AVBPrint pan_buf;
786 // av_bprint_init(&pan_buf, 256, 8192);
787 // av_bprintf(&pan_buf, "0x%"PRIx64,
788 // av_get_default_channel_layout(ost->audio_channels_mapped));
789 // for (i = 0; i < ost->audio_channels_mapped; i++)
790 // if (ost->audio_channels_map[i] != -1)
791 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
792 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
793 // av_bprint_finalize(&pan_buf, NULL);
794 // }
795 
796  if (audio_volume != 256) {
797  char args[256];
798 
799  av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
800  "audio filter instead.\n");
801 
802  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
803  AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
804  }
805 
806  snprintf(name, sizeof(name), "trim for input stream %d:%d",
807  ist->file_index, ist->st->index);
808  ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
809  AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
810  if (ret < 0)
811  return ret;
812 
813  if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
814  return ret;
815 
816  return 0;
817 }
818 
819 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
820  AVFilterInOut *in)
821 {
822  av_freep(&ifilter->name);
823  DESCRIBE_FILTER_LINK(ifilter, in, 1);
824 
825  switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
826  case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
827  case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
828  default: av_assert0(0);
829  }
830 }
831 
832 int configure_filtergraph(FilterGraph *fg)
833 {
834  AVFilterInOut *inputs, *outputs, *cur;
835  int ret, i, init = !fg->graph, simple = !fg->graph_desc;
836  const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
837  fg->graph_desc;
838 
839  avfilter_graph_free(&fg->graph);
840  if (!(fg->graph = avfilter_graph_alloc()))
841  return AVERROR(ENOMEM);
842 
843  if (simple) {
844  OutputStream *ost = fg->outputs[0]->ost;
845  char args[512];
846  AVDictionaryEntry *e = NULL;
847 
848  snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
849  fg->graph->scale_sws_opts = av_strdup(args);
850 
851  args[0] = 0;
852  while ((e = av_dict_get(ost->swr_opts, "", e,
853  AV_DICT_IGNORE_SUFFIX))) {
854  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
855  }
856  if (strlen(args))
857  args[strlen(args)-1] = 0;
858  av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
859 
860  args[0] = '\0';
861  while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
862  AV_DICT_IGNORE_SUFFIX))) {
863  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
864  }
865  if (strlen(args))
866  args[strlen(args) - 1] = '\0';
867  fg->graph->resample_lavr_opts = av_strdup(args);
868 
869  e = av_dict_get(ost->opts, "threads", NULL, 0);
870  if (e)
871  av_opt_set(fg->graph, "threads", e->value, 0);
872  }
873 
874  if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
875  return ret;
876 
877  if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
878  av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
879  "exactly one input and output.\n", graph_desc);
880  return AVERROR(EINVAL);
881  }
882 
883  for (cur = inputs; !simple && init && cur; cur = cur->next)
884  init_input_filter(fg, cur);
885 
886  for (cur = inputs, i = 0; cur; cur = cur->next, i++)
887  if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
888  return ret;
889  avfilter_inout_free(&inputs);
890 
891  if (!init || simple) {
892  /* we already know the mappings between lavfi outputs and output streams,
893  * so we can finish the setup */
894  for (cur = outputs, i = 0; cur; cur = cur->next, i++)
895  configure_output_filter(fg, fg->outputs[i], cur);
896  avfilter_inout_free(&outputs);
897 
898  if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
899  return ret;
900  } else {
901  /* wait until output mappings are processed */
902  for (cur = outputs; cur;) {
903  GROW_ARRAY(fg->outputs, fg->nb_outputs);
904  if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
905  exit_program(1);
906  fg->outputs[fg->nb_outputs - 1]->graph = fg;
907  fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
908  cur = cur->next;
909  fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
910  }
911  }
912 
913  fg->reconfiguration = 1;
914  return 0;
915 }
916 
917 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
918 {
919  int i;
920  for (i = 0; i < fg->nb_inputs; i++)
921  if (fg->inputs[i]->ist == ist)
922  return 1;
923  return 0;
924 }
925 
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