FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
ffmpeg_filter.c
Go to the documentation of this file.
1 /*
2  * ffmpeg filter configuration
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 
21 #include <stdint.h>
22 
23 #include "ffmpeg.h"
24 
25 #include "libavfilter/avfilter.h"
26 #include "libavfilter/buffersink.h"
27 
28 #include "libavresample/avresample.h"
29 
30 #include "libavutil/avassert.h"
31 #include "libavutil/avstring.h"
32 #include "libavutil/bprint.h"
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/opt.h"
35 #include "libavutil/pixdesc.h"
36 #include "libavutil/pixfmt.h"
37 #include "libavutil/imgutils.h"
38 #include "libavutil/samplefmt.h"
39 
40 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
41 {
42  if (codec && codec->pix_fmts) {
43  const enum AVPixelFormat *p = codec->pix_fmts;
44  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
45  int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
46  enum AVPixelFormat best= AV_PIX_FMT_NONE;
47  if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
48  if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
49  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
50  } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
51  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
52  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
53  }
54  }
55  for (; *p != AV_PIX_FMT_NONE; p++) {
56  best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
57  if (*p == target)
58  break;
59  }
60  if (*p == AV_PIX_FMT_NONE) {
61  if (target != AV_PIX_FMT_NONE)
62  av_log(NULL, AV_LOG_WARNING,
63  "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
64  av_get_pix_fmt_name(target),
65  codec->name,
66  av_get_pix_fmt_name(best));
67  return best;
68  }
69  }
70  return target;
71 }
72 
73 void choose_sample_fmt(AVStream *st, AVCodec *codec)
74 {
75  if (codec && codec->sample_fmts) {
76  const enum AVSampleFormat *p = codec->sample_fmts;
77  for (; *p != -1; p++) {
78  if (*p == st->codec->sample_fmt)
79  break;
80  }
81  if (*p == -1) {
82  if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
83  av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
84  if(av_get_sample_fmt_name(st->codec->sample_fmt))
85  av_log(NULL, AV_LOG_WARNING,
86  "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
87  av_get_sample_fmt_name(st->codec->sample_fmt),
88  codec->name,
89  av_get_sample_fmt_name(codec->sample_fmts[0]));
90  st->codec->sample_fmt = codec->sample_fmts[0];
91  }
92  }
93 }
94 
95 static char *choose_pix_fmts(OutputStream *ost)
96 {
97  AVDictionaryEntry *strict_dict = av_dict_get(ost->opts, "strict", NULL, 0);
98  if (strict_dict)
99  // used by choose_pixel_fmt() and below
100  av_opt_set(ost->st->codec, "strict", strict_dict->value, 0);
101 
102  if (ost->keep_pix_fmt) {
103  if (ost->filter)
104  avfilter_graph_set_auto_convert(ost->filter->graph->graph,
105  AVFILTER_AUTO_CONVERT_NONE);
106  if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
107  return NULL;
108  return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
109  }
110  if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
111  return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
112  } else if (ost->enc && ost->enc->pix_fmts) {
113  const enum AVPixelFormat *p;
114  AVIOContext *s = NULL;
115  uint8_t *ret;
116  int len;
117 
118  if (avio_open_dyn_buf(&s) < 0)
119  exit_program(1);
120 
121  p = ost->enc->pix_fmts;
122  if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
123  if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
124  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
125  } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
126  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
127  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
128  }
129  }
130 
131  for (; *p != AV_PIX_FMT_NONE; p++) {
132  const char *name = av_get_pix_fmt_name(*p);
133  avio_printf(s, "%s|", name);
134  }
135  len = avio_close_dyn_buf(s, &ret);
136  ret[len - 1] = 0;
137  return ret;
138  } else
139  return NULL;
140 }
141 
142 /* Define a function for building a string containing a list of
143  * allowed formats. */
144 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name) \
145 static char *choose_ ## var ## s(OutputStream *ost) \
146 { \
147  if (ost->st->codec->var != none) { \
148  get_name(ost->st->codec->var); \
149  return av_strdup(name); \
150  } else if (ost->enc && ost->enc->supported_list) { \
151  const type *p; \
152  AVIOContext *s = NULL; \
153  uint8_t *ret; \
154  int len; \
155  \
156  if (avio_open_dyn_buf(&s) < 0) \
157  exit_program(1); \
158  \
159  for (p = ost->enc->supported_list; *p != none; p++) { \
160  get_name(*p); \
161  avio_printf(s, "%s|", name); \
162  } \
163  len = avio_close_dyn_buf(s, &ret); \
164  ret[len - 1] = 0; \
165  return ret; \
166  } else \
167  return NULL; \
168 }
169 
170 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
171 // GET_PIX_FMT_NAME)
172 
173 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
174  AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME)
175 
176 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
177  GET_SAMPLE_RATE_NAME)
178 
179 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
180  GET_CH_LAYOUT_NAME)
181 
182 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
183 {
184  FilterGraph *fg = av_mallocz(sizeof(*fg));
185 
186  if (!fg)
187  exit_program(1);
188  fg->index = nb_filtergraphs;
189 
190  GROW_ARRAY(fg->outputs, fg->nb_outputs);
191  if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
192  exit_program(1);
193  fg->outputs[0]->ost = ost;
194  fg->outputs[0]->graph = fg;
195 
196  ost->filter = fg->outputs[0];
197 
198  GROW_ARRAY(fg->inputs, fg->nb_inputs);
199  if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
200  exit_program(1);
201  fg->inputs[0]->ist = ist;
202  fg->inputs[0]->graph = fg;
203 
204  GROW_ARRAY(ist->filters, ist->nb_filters);
205  ist->filters[ist->nb_filters - 1] = fg->inputs[0];
206 
207  GROW_ARRAY(filtergraphs, nb_filtergraphs);
208  filtergraphs[nb_filtergraphs - 1] = fg;
209 
210  return fg;
211 }
212 
213 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
214 {
215  InputStream *ist = NULL;
216  enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
217  int i;
218 
219  // TODO: support other filter types
220  if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
221  av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
222  "currently.\n");
223  exit_program(1);
224  }
225 
226  if (in->name) {
227  AVFormatContext *s;
228  AVStream *st = NULL;
229  char *p;
230  int file_idx = strtol(in->name, &p, 0);
231 
232  if (file_idx < 0 || file_idx >= nb_input_files) {
233  av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
234  file_idx, fg->graph_desc);
235  exit_program(1);
236  }
237  s = input_files[file_idx]->ctx;
238 
239  for (i = 0; i < s->nb_streams; i++) {
240  enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
241  if (stream_type != type &&
242  !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
243  type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
244  continue;
245  if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
246  st = s->streams[i];
247  break;
248  }
249  }
250  if (!st) {
251  av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
252  "matches no streams.\n", p, fg->graph_desc);
253  exit_program(1);
254  }
255  ist = input_streams[input_files[file_idx]->ist_index + st->index];
256  } else {
257  /* find the first unused stream of corresponding type */
258  for (i = 0; i < nb_input_streams; i++) {
259  ist = input_streams[i];
260  if (ist->st->codec->codec_type == type && ist->discard)
261  break;
262  }
263  if (i == nb_input_streams) {
264  av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
265  "unlabeled input pad %d on filter %s\n", in->pad_idx,
266  in->filter_ctx->name);
267  exit_program(1);
268  }
269  }
270  av_assert0(ist);
271 
272  ist->discard = 0;
273  ist->decoding_needed++;
274  ist->st->discard = AVDISCARD_NONE;
275 
276  GROW_ARRAY(fg->inputs, fg->nb_inputs);
277  if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
278  exit_program(1);
279  fg->inputs[fg->nb_inputs - 1]->ist = ist;
280  fg->inputs[fg->nb_inputs - 1]->graph = fg;
281 
282  GROW_ARRAY(ist->filters, ist->nb_filters);
283  ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
284 }
285 
286 static int insert_trim(int64_t start_time, int64_t duration,
287  AVFilterContext **last_filter, int *pad_idx,
288  const char *filter_name)
289 {
290  AVFilterGraph *graph = (*last_filter)->graph;
291  AVFilterContext *ctx;
292  const AVFilter *trim;
293  enum AVMediaType type = avfilter_pad_get_type((*last_filter)->output_pads, *pad_idx);
294  const char *name = (type == AVMEDIA_TYPE_VIDEO) ? "trim" : "atrim";
295  int ret = 0;
296 
297  if (duration == INT64_MAX && start_time == AV_NOPTS_VALUE)
298  return 0;
299 
300  trim = avfilter_get_by_name(name);
301  if (!trim) {
302  av_log(NULL, AV_LOG_ERROR, "%s filter not present, cannot limit "
303  "recording time.\n", name);
304  return AVERROR_FILTER_NOT_FOUND;
305  }
306 
307  ctx = avfilter_graph_alloc_filter(graph, trim, filter_name);
308  if (!ctx)
309  return AVERROR(ENOMEM);
310 
311  if (duration != INT64_MAX) {
312  ret = av_opt_set_int(ctx, "durationi", duration,
313  AV_OPT_SEARCH_CHILDREN);
314  }
315  if (ret >= 0 && start_time != AV_NOPTS_VALUE) {
316  ret = av_opt_set_int(ctx, "starti", start_time,
317  AV_OPT_SEARCH_CHILDREN);
318  }
319  if (ret < 0) {
320  av_log(ctx, AV_LOG_ERROR, "Error configuring the %s filter", name);
321  return ret;
322  }
323 
324  ret = avfilter_init_str(ctx, NULL);
325  if (ret < 0)
326  return ret;
327 
328  ret = avfilter_link(*last_filter, *pad_idx, ctx, 0);
329  if (ret < 0)
330  return ret;
331 
332  *last_filter = ctx;
333  *pad_idx = 0;
334  return 0;
335 }
336 
337 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
338 {
339  char *pix_fmts;
340  OutputStream *ost = ofilter->ost;
341  OutputFile *of = output_files[ost->file_index];
342  AVCodecContext *codec = ost->st->codec;
343  AVFilterContext *last_filter = out->filter_ctx;
344  int pad_idx = out->pad_idx;
345  int ret;
346  char name[255];
347 
348  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
349  ret = avfilter_graph_create_filter(&ofilter->filter,
350  avfilter_get_by_name("buffersink"),
351  name, NULL, NULL, fg->graph);
352 
353  if (ret < 0)
354  return ret;
355 
356  if (codec->width || codec->height) {
357  char args[255];
358  AVFilterContext *filter;
359 
360  snprintf(args, sizeof(args), "%d:%d:0x%X",
361  codec->width,
362  codec->height,
363  (unsigned)ost->sws_flags);
364  snprintf(name, sizeof(name), "scaler for output stream %d:%d",
365  ost->file_index, ost->index);
366  if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
367  name, args, NULL, fg->graph)) < 0)
368  return ret;
369  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
370  return ret;
371 
372  last_filter = filter;
373  pad_idx = 0;
374  }
375 
376  if ((pix_fmts = choose_pix_fmts(ost))) {
377  AVFilterContext *filter;
378  snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
379  ost->file_index, ost->index);
380  ret = avfilter_graph_create_filter(&filter,
381  avfilter_get_by_name("format"),
382  "format", pix_fmts, NULL,
383  fg->graph);
384  av_freep(&pix_fmts);
385  if (ret < 0)
386  return ret;
387  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
388  return ret;
389 
390  last_filter = filter;
391  pad_idx = 0;
392  }
393 
394  if (ost->frame_rate.num && 0) {
395  AVFilterContext *fps;
396  char args[255];
397 
398  snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
399  ost->frame_rate.den);
400  snprintf(name, sizeof(name), "fps for output stream %d:%d",
401  ost->file_index, ost->index);
402  ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
403  name, args, NULL, fg->graph);
404  if (ret < 0)
405  return ret;
406 
407  ret = avfilter_link(last_filter, pad_idx, fps, 0);
408  if (ret < 0)
409  return ret;
410  last_filter = fps;
411  pad_idx = 0;
412  }
413 
414  snprintf(name, sizeof(name), "trim for output stream %d:%d",
415  ost->file_index, ost->index);
416  ret = insert_trim(of->start_time, of->recording_time,
417  &last_filter, &pad_idx, name);
418  if (ret < 0)
419  return ret;
420 
421 
422  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
423  return ret;
424 
425  return 0;
426 }
427 
428 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
429 {
430  OutputStream *ost = ofilter->ost;
431  OutputFile *of = output_files[ost->file_index];
432  AVCodecContext *codec = ost->st->codec;
433  AVFilterContext *last_filter = out->filter_ctx;
434  int pad_idx = out->pad_idx;
435  char *sample_fmts, *sample_rates, *channel_layouts;
436  char name[255];
437  int ret;
438 
439  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
440  ret = avfilter_graph_create_filter(&ofilter->filter,
441  avfilter_get_by_name("abuffersink"),
442  name, NULL, NULL, fg->graph);
443  if (ret < 0)
444  return ret;
445  if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
446  return ret;
447 
448 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
449  AVFilterContext *filt_ctx; \
450  \
451  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
452  "similarly to -af " filter_name "=%s.\n", arg); \
453  \
454  ret = avfilter_graph_create_filter(&filt_ctx, \
455  avfilter_get_by_name(filter_name), \
456  filter_name, arg, NULL, fg->graph); \
457  if (ret < 0) \
458  return ret; \
459  \
460  ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
461  if (ret < 0) \
462  return ret; \
463  \
464  last_filter = filt_ctx; \
465  pad_idx = 0; \
466 } while (0)
467  if (ost->audio_channels_mapped) {
468  int i;
469  AVBPrint pan_buf;
470  av_bprint_init(&pan_buf, 256, 8192);
471  av_bprintf(&pan_buf, "0x%"PRIx64,
472  av_get_default_channel_layout(ost->audio_channels_mapped));
473  for (i = 0; i < ost->audio_channels_mapped; i++)
474  if (ost->audio_channels_map[i] != -1)
475  av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
476 
477  AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
478  av_bprint_finalize(&pan_buf, NULL);
479  }
480 
481  if (codec->channels && !codec->channel_layout)
482  codec->channel_layout = av_get_default_channel_layout(codec->channels);
483 
484  sample_fmts = choose_sample_fmts(ost);
485  sample_rates = choose_sample_rates(ost);
486  channel_layouts = choose_channel_layouts(ost);
487  if (sample_fmts || sample_rates || channel_layouts) {
488  AVFilterContext *format;
489  char args[256];
490  args[0] = 0;
491 
492  if (sample_fmts)
493  av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
494  sample_fmts);
495  if (sample_rates)
496  av_strlcatf(args, sizeof(args), "sample_rates=%s:",
497  sample_rates);
498  if (channel_layouts)
499  av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
500  channel_layouts);
501 
502  av_freep(&sample_fmts);
503  av_freep(&sample_rates);
504  av_freep(&channel_layouts);
505 
506  snprintf(name, sizeof(name), "audio format for output stream %d:%d",
507  ost->file_index, ost->index);
508  ret = avfilter_graph_create_filter(&format,
509  avfilter_get_by_name("aformat"),
510  name, args, NULL, fg->graph);
511  if (ret < 0)
512  return ret;
513 
514  ret = avfilter_link(last_filter, pad_idx, format, 0);
515  if (ret < 0)
516  return ret;
517 
518  last_filter = format;
519  pad_idx = 0;
520  }
521 
522  if (audio_volume != 256 && 0) {
523  char args[256];
524 
525  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
526  AUTO_INSERT_FILTER("-vol", "volume", args);
527  }
528 
529  if (ost->apad && of->shortest) {
530  char args[256];
531  int i;
532 
533  for (i=0; i<of->ctx->nb_streams; i++)
534  if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
535  break;
536 
537  if (i<of->ctx->nb_streams) {
538  snprintf(args, sizeof(args), "%s", ost->apad);
539  AUTO_INSERT_FILTER("-apad", "apad", args);
540  }
541  }
542 
543  snprintf(name, sizeof(name), "trim for output stream %d:%d",
544  ost->file_index, ost->index);
545  ret = insert_trim(of->start_time, of->recording_time,
546  &last_filter, &pad_idx, name);
547  if (ret < 0)
548  return ret;
549 
550  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
551  return ret;
552 
553  return 0;
554 }
555 
556 #define DESCRIBE_FILTER_LINK(f, inout, in) \
557 { \
558  AVFilterContext *ctx = inout->filter_ctx; \
559  AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
560  int nb_pads = in ? ctx->nb_inputs : ctx->nb_outputs; \
561  AVIOContext *pb; \
562  \
563  if (avio_open_dyn_buf(&pb) < 0) \
564  exit_program(1); \
565  \
566  avio_printf(pb, "%s", ctx->filter->name); \
567  if (nb_pads > 1) \
568  avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
569  avio_w8(pb, 0); \
570  avio_close_dyn_buf(pb, &f->name); \
571 }
572 
573 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
574 {
575  av_freep(&ofilter->name);
576  DESCRIBE_FILTER_LINK(ofilter, out, 0);
577 
578  switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
579  case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
580  case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
581  default: av_assert0(0);
582  }
583 }
584 
585 static int sub2video_prepare(InputStream *ist)
586 {
587  AVFormatContext *avf = input_files[ist->file_index]->ctx;
588  int i, w, h;
589 
590  /* Compute the size of the canvas for the subtitles stream.
591  If the subtitles codec has set a size, use it. Otherwise use the
592  maximum dimensions of the video streams in the same file. */
593  w = ist->st->codec->width;
594  h = ist->st->codec->height;
595  if (!(w && h)) {
596  for (i = 0; i < avf->nb_streams; i++) {
597  if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
598  w = FFMAX(w, avf->streams[i]->codec->width);
599  h = FFMAX(h, avf->streams[i]->codec->height);
600  }
601  }
602  if (!(w && h)) {
603  w = FFMAX(w, 720);
604  h = FFMAX(h, 576);
605  }
606  av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
607  }
608  ist->sub2video.w = ist->st->codec->width = ist->resample_width = w;
609  ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
610 
611  /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
612  palettes for all rectangles are identical or compatible */
613  ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
614 
615  ist->sub2video.frame = av_frame_alloc();
616  if (!ist->sub2video.frame)
617  return AVERROR(ENOMEM);
618  return 0;
619 }
620 
621 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
622  AVFilterInOut *in)
623 {
624  AVFilterContext *last_filter;
625  const AVFilter *buffer_filt = avfilter_get_by_name("buffer");
626  InputStream *ist = ifilter->ist;
627  InputFile *f = input_files[ist->file_index];
628  AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
629  ist->st->time_base;
630  AVRational fr = ist->framerate;
631  AVRational sar;
632  AVBPrint args;
633  char name[255];
634  int ret, pad_idx = 0;
635 
636  if (ist->st->codec->codec_type == AVMEDIA_TYPE_AUDIO) {
637  av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
638  return AVERROR(EINVAL);
639  }
640 
641  if (!fr.num)
642  fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
643 
644  if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
645  ret = sub2video_prepare(ist);
646  if (ret < 0)
647  return ret;
648  }
649 
650  sar = ist->st->sample_aspect_ratio.num ?
651  ist->st->sample_aspect_ratio :
652  ist->st->codec->sample_aspect_ratio;
653  if(!sar.den)
654  sar = (AVRational){0,1};
655  av_bprint_init(&args, 0, 1);
656  av_bprintf(&args,
657  "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
658  "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
659  ist->resample_height,
660  ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
661  tb.num, tb.den, sar.num, sar.den,
662  SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
663  if (fr.num && fr.den)
664  av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
665  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
666  ist->file_index, ist->st->index);
667 
668  if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
669  args.str, NULL, fg->graph)) < 0)
670  return ret;
671  last_filter = ifilter->filter;
672 
673  if (ist->framerate.num) {
674  AVFilterContext *setpts;
675 
676  snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
677  ist->file_index, ist->st->index);
678  if ((ret = avfilter_graph_create_filter(&setpts,
679  avfilter_get_by_name("setpts"),
680  name, "N", NULL,
681  fg->graph)) < 0)
682  return ret;
683 
684  if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
685  return ret;
686 
687  last_filter = setpts;
688  }
689 
690  if (do_deinterlace) {
691  AVFilterContext *yadif;
692 
693  snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
694  ist->file_index, ist->st->index);
695  if ((ret = avfilter_graph_create_filter(&yadif,
696  avfilter_get_by_name("yadif"),
697  name, "", NULL,
698  fg->graph)) < 0)
699  return ret;
700 
701  if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
702  return ret;
703 
704  last_filter = yadif;
705  }
706 
707  snprintf(name, sizeof(name), "trim for input stream %d:%d",
708  ist->file_index, ist->st->index);
709  ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
710  AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
711  if (ret < 0)
712  return ret;
713 
714  if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
715  return ret;
716  return 0;
717 }
718 
719 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
720  AVFilterInOut *in)
721 {
722  AVFilterContext *last_filter;
723  const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
724  InputStream *ist = ifilter->ist;
725  InputFile *f = input_files[ist->file_index];
726  AVBPrint args;
727  char name[255];
728  int ret, pad_idx = 0;
729 
730  if (ist->st->codec->codec_type != AVMEDIA_TYPE_AUDIO) {
731  av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
732  return AVERROR(EINVAL);
733  }
734 
735  av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
736  av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
737  1, ist->st->codec->sample_rate,
738  ist->st->codec->sample_rate,
739  av_get_sample_fmt_name(ist->st->codec->sample_fmt));
740  if (ist->st->codec->channel_layout)
741  av_bprintf(&args, ":channel_layout=0x%"PRIx64,
742  ist->st->codec->channel_layout);
743  else
744  av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
745  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
746  ist->file_index, ist->st->index);
747 
748  if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
749  name, args.str, NULL,
750  fg->graph)) < 0)
751  return ret;
752  last_filter = ifilter->filter;
753 
754 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
755  AVFilterContext *filt_ctx; \
756  \
757  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
758  "similarly to -af " filter_name "=%s.\n", arg); \
759  \
760  snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
761  fg->index, filter_name, ist->file_index, ist->st->index); \
762  ret = avfilter_graph_create_filter(&filt_ctx, \
763  avfilter_get_by_name(filter_name), \
764  name, arg, NULL, fg->graph); \
765  if (ret < 0) \
766  return ret; \
767  \
768  ret = avfilter_link(last_filter, 0, filt_ctx, 0); \
769  if (ret < 0) \
770  return ret; \
771  \
772  last_filter = filt_ctx; \
773 } while (0)
774 
775  if (audio_sync_method > 0) {
776  char args[256] = {0};
777 
778  av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
779  if (audio_drift_threshold != 0.1)
780  av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
781  if (!fg->reconfiguration)
782  av_strlcatf(args, sizeof(args), ":first_pts=0");
783  AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
784  }
785 
786 // if (ost->audio_channels_mapped) {
787 // int i;
788 // AVBPrint pan_buf;
789 // av_bprint_init(&pan_buf, 256, 8192);
790 // av_bprintf(&pan_buf, "0x%"PRIx64,
791 // av_get_default_channel_layout(ost->audio_channels_mapped));
792 // for (i = 0; i < ost->audio_channels_mapped; i++)
793 // if (ost->audio_channels_map[i] != -1)
794 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
795 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
796 // av_bprint_finalize(&pan_buf, NULL);
797 // }
798 
799  if (audio_volume != 256) {
800  char args[256];
801 
802  av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
803  "audio filter instead.\n");
804 
805  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
806  AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
807  }
808 
809  snprintf(name, sizeof(name), "trim for input stream %d:%d",
810  ist->file_index, ist->st->index);
811  ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
812  AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
813  if (ret < 0)
814  return ret;
815 
816  if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
817  return ret;
818 
819  return 0;
820 }
821 
822 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
823  AVFilterInOut *in)
824 {
825  av_freep(&ifilter->name);
826  DESCRIBE_FILTER_LINK(ifilter, in, 1);
827 
828  switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
829  case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
830  case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
831  default: av_assert0(0);
832  }
833 }
834 
835 int configure_filtergraph(FilterGraph *fg)
836 {
837  AVFilterInOut *inputs, *outputs, *cur;
838  int ret, i, init = !fg->graph, simple = !fg->graph_desc;
839  const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
840  fg->graph_desc;
841 
842  avfilter_graph_free(&fg->graph);
843  if (!(fg->graph = avfilter_graph_alloc()))
844  return AVERROR(ENOMEM);
845 
846  if (simple) {
847  OutputStream *ost = fg->outputs[0]->ost;
848  char args[512];
849  AVDictionaryEntry *e = NULL;
850 
851  snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
852  fg->graph->scale_sws_opts = av_strdup(args);
853 
854  args[0] = 0;
855  while ((e = av_dict_get(ost->swr_opts, "", e,
856  AV_DICT_IGNORE_SUFFIX))) {
857  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
858  }
859  if (strlen(args))
860  args[strlen(args)-1] = 0;
861  av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
862 
863  args[0] = '\0';
864  while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
865  AV_DICT_IGNORE_SUFFIX))) {
866  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
867  }
868  if (strlen(args))
869  args[strlen(args) - 1] = '\0';
870  fg->graph->resample_lavr_opts = av_strdup(args);
871 
872  e = av_dict_get(ost->opts, "threads", NULL, 0);
873  if (e)
874  av_opt_set(fg->graph, "threads", e->value, 0);
875  }
876 
877  if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
878  return ret;
879 
880  if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
881  av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
882  "exactly one input and output.\n", graph_desc);
883  return AVERROR(EINVAL);
884  }
885 
886  for (cur = inputs; !simple && init && cur; cur = cur->next)
887  init_input_filter(fg, cur);
888 
889  for (cur = inputs, i = 0; cur; cur = cur->next, i++)
890  if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
891  return ret;
892  avfilter_inout_free(&inputs);
893 
894  if (!init || simple) {
895  /* we already know the mappings between lavfi outputs and output streams,
896  * so we can finish the setup */
897  for (cur = outputs, i = 0; cur; cur = cur->next, i++)
898  configure_output_filter(fg, fg->outputs[i], cur);
899  avfilter_inout_free(&outputs);
900 
901  if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
902  return ret;
903  } else {
904  /* wait until output mappings are processed */
905  for (cur = outputs; cur;) {
906  GROW_ARRAY(fg->outputs, fg->nb_outputs);
907  if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
908  exit_program(1);
909  fg->outputs[fg->nb_outputs - 1]->graph = fg;
910  fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
911  cur = cur->next;
912  fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
913  }
914  }
915 
916  fg->reconfiguration = 1;
917  return 0;
918 }
919 
920 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
921 {
922  int i;
923  for (i = 0; i < fg->nb_inputs; i++)
924  if (fg->inputs[i]->ist == ist)
925  return 1;
926  return 0;
927 }
928 
Generated on Mon Mar 10 2014 19:20:53 for FFmpeg by   doxygen 1.8.2