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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,
388  fg->graph);
389  av_freep(&pix_fmts);
390  if (ret < 0)
391  return ret;
392  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
393  return ret;
394 
395  last_filter = filter;
396  pad_idx = 0;
397  }
398 
399  if (ost->frame_rate.num && 0) {
400  AVFilterContext *fps;
401  char args[255];
402 
403  snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
404  ost->frame_rate.den);
405  snprintf(name, sizeof(name), "fps for output stream %d:%d",
406  ost->file_index, ost->index);
407  ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
408  name, args, NULL, fg->graph);
409  if (ret < 0)
410  return ret;
411 
412  ret = avfilter_link(last_filter, pad_idx, fps, 0);
413  if (ret < 0)
414  return ret;
415  last_filter = fps;
416  pad_idx = 0;
417  }
418 
419  snprintf(name, sizeof(name), "trim for output stream %d:%d",
420  ost->file_index, ost->index);
421  ret = insert_trim(of->start_time, of->recording_time,
422  &last_filter, &pad_idx, name);
423  if (ret < 0)
424  return ret;
425 
426 
427  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
428  return ret;
429 
430  return 0;
431 }
432 
433 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
434 {
435  OutputStream *ost = ofilter->ost;
436  OutputFile *of = output_files[ost->file_index];
437  AVCodecContext *codec = ost->enc_ctx;
438  AVFilterContext *last_filter = out->filter_ctx;
439  int pad_idx = out->pad_idx;
440  char *sample_fmts, *sample_rates, *channel_layouts;
441  char name[255];
442  int ret;
443 
444  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
445  ret = avfilter_graph_create_filter(&ofilter->filter,
446  avfilter_get_by_name("abuffersink"),
447  name, NULL, NULL, fg->graph);
448  if (ret < 0)
449  return ret;
450  if ((ret = av_opt_set_int(ofilter->filter, "all_channel_counts", 1, AV_OPT_SEARCH_CHILDREN)) < 0)
451  return ret;
452 
453 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
454  AVFilterContext *filt_ctx; \
455  \
456  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
457  "similarly to -af " filter_name "=%s.\n", arg); \
458  \
459  ret = avfilter_graph_create_filter(&filt_ctx, \
460  avfilter_get_by_name(filter_name), \
461  filter_name, arg, NULL, fg->graph); \
462  if (ret < 0) \
463  return ret; \
464  \
465  ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
466  if (ret < 0) \
467  return ret; \
468  \
469  last_filter = filt_ctx; \
470  pad_idx = 0; \
471 } while (0)
472  if (ost->audio_channels_mapped) {
473  int i;
474  AVBPrint pan_buf;
475  av_bprint_init(&pan_buf, 256, 8192);
476  av_bprintf(&pan_buf, "0x%"PRIx64,
477  av_get_default_channel_layout(ost->audio_channels_mapped));
478  for (i = 0; i < ost->audio_channels_mapped; i++)
479  if (ost->audio_channels_map[i] != -1)
480  av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
481 
482  AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
483  av_bprint_finalize(&pan_buf, NULL);
484  }
485 
486  if (codec->channels && !codec->channel_layout)
487  codec->channel_layout = av_get_default_channel_layout(codec->channels);
488 
489  sample_fmts = choose_sample_fmts(ost);
490  sample_rates = choose_sample_rates(ost);
491  channel_layouts = choose_channel_layouts(ost);
492  if (sample_fmts || sample_rates || channel_layouts) {
493  AVFilterContext *format;
494  char args[256];
495  args[0] = 0;
496 
497  if (sample_fmts)
498  av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
499  sample_fmts);
500  if (sample_rates)
501  av_strlcatf(args, sizeof(args), "sample_rates=%s:",
502  sample_rates);
503  if (channel_layouts)
504  av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
505  channel_layouts);
506 
507  av_freep(&sample_fmts);
508  av_freep(&sample_rates);
509  av_freep(&channel_layouts);
510 
511  snprintf(name, sizeof(name), "audio format for output stream %d:%d",
512  ost->file_index, ost->index);
513  ret = avfilter_graph_create_filter(&format,
514  avfilter_get_by_name("aformat"),
515  name, args, NULL, fg->graph);
516  if (ret < 0)
517  return ret;
518 
519  ret = avfilter_link(last_filter, pad_idx, format, 0);
520  if (ret < 0)
521  return ret;
522 
523  last_filter = format;
524  pad_idx = 0;
525  }
526 
527  if (audio_volume != 256 && 0) {
528  char args[256];
529 
530  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
531  AUTO_INSERT_FILTER("-vol", "volume", args);
532  }
533 
534  if (ost->apad && of->shortest) {
535  char args[256];
536  int i;
537 
538  for (i=0; i<of->ctx->nb_streams; i++)
539  if (of->ctx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
540  break;
541 
542  if (i<of->ctx->nb_streams) {
543  snprintf(args, sizeof(args), "%s", ost->apad);
544  AUTO_INSERT_FILTER("-apad", "apad", args);
545  }
546  }
547 
548  snprintf(name, sizeof(name), "trim for output stream %d:%d",
549  ost->file_index, ost->index);
550  ret = insert_trim(of->start_time, of->recording_time,
551  &last_filter, &pad_idx, name);
552  if (ret < 0)
553  return ret;
554 
555  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
556  return ret;
557 
558  return 0;
559 }
560 
561 #define DESCRIBE_FILTER_LINK(f, inout, in) \
562 { \
563  AVFilterContext *ctx = inout->filter_ctx; \
564  AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
565  int nb_pads = in ? ctx->nb_inputs : ctx->nb_outputs; \
566  AVIOContext *pb; \
567  \
568  if (avio_open_dyn_buf(&pb) < 0) \
569  exit_program(1); \
570  \
571  avio_printf(pb, "%s", ctx->filter->name); \
572  if (nb_pads > 1) \
573  avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
574  avio_w8(pb, 0); \
575  avio_close_dyn_buf(pb, &f->name); \
576 }
577 
578 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
579 {
580  av_freep(&ofilter->name);
581  DESCRIBE_FILTER_LINK(ofilter, out, 0);
582 
583  switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
584  case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
585  case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
586  default: av_assert0(0);
587  }
588 }
589 
590 static int sub2video_prepare(InputStream *ist)
591 {
592  AVFormatContext *avf = input_files[ist->file_index]->ctx;
593  int i, w, h;
594 
595  /* Compute the size of the canvas for the subtitles stream.
596  If the subtitles codec has set a size, use it. Otherwise use the
597  maximum dimensions of the video streams in the same file. */
598  w = ist->dec_ctx->width;
599  h = ist->dec_ctx->height;
600  if (!(w && h)) {
601  for (i = 0; i < avf->nb_streams; i++) {
602  if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
603  w = FFMAX(w, avf->streams[i]->codec->width);
604  h = FFMAX(h, avf->streams[i]->codec->height);
605  }
606  }
607  if (!(w && h)) {
608  w = FFMAX(w, 720);
609  h = FFMAX(h, 576);
610  }
611  av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
612  }
613  ist->sub2video.w = ist->dec_ctx->width = ist->resample_width = w;
614  ist->sub2video.h = ist->dec_ctx->height = ist->resample_height = h;
615 
616  /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
617  palettes for all rectangles are identical or compatible */
618  ist->resample_pix_fmt = ist->dec_ctx->pix_fmt = AV_PIX_FMT_RGB32;
619 
620  ist->sub2video.frame = av_frame_alloc();
621  if (!ist->sub2video.frame)
622  return AVERROR(ENOMEM);
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 
641  if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_AUDIO) {
642  av_log(NULL, AV_LOG_ERROR, "Cannot connect video filter to audio input\n");
643  return AVERROR(EINVAL);
644  }
645 
646  if (!fr.num)
647  fr = av_guess_frame_rate(input_files[ist->file_index]->ctx, ist->st, NULL);
648 
649  if (ist->dec_ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
650  ret = sub2video_prepare(ist);
651  if (ret < 0)
652  return ret;
653  }
654 
655  sar = ist->st->sample_aspect_ratio.num ?
656  ist->st->sample_aspect_ratio :
657  ist->dec_ctx->sample_aspect_ratio;
658  if(!sar.den)
659  sar = (AVRational){0,1};
660  av_bprint_init(&args, 0, 1);
661  av_bprintf(&args,
662  "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
663  "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
664  ist->resample_height,
665  ist->hwaccel_retrieve_data ? ist->hwaccel_retrieved_pix_fmt : ist->resample_pix_fmt,
666  tb.num, tb.den, sar.num, sar.den,
667  SWS_BILINEAR + ((ist->dec_ctx->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
668  if (fr.num && fr.den)
669  av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
670  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
671  ist->file_index, ist->st->index);
672 
673  if ((ret = avfilter_graph_create_filter(&ifilter->filter, buffer_filt, name,
674  args.str, NULL, fg->graph)) < 0)
675  return ret;
676  last_filter = ifilter->filter;
677 
678  if (ist->framerate.num) {
679  AVFilterContext *setpts;
680 
681  snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
682  ist->file_index, ist->st->index);
683  if ((ret = avfilter_graph_create_filter(&setpts,
684  avfilter_get_by_name("setpts"),
685  name, "N", NULL,
686  fg->graph)) < 0)
687  return ret;
688 
689  if ((ret = avfilter_link(last_filter, 0, setpts, 0)) < 0)
690  return ret;
691 
692  last_filter = setpts;
693  }
694 
695  if (do_deinterlace) {
696  AVFilterContext *yadif;
697 
698  snprintf(name, sizeof(name), "deinterlace input from stream %d:%d",
699  ist->file_index, ist->st->index);
700  if ((ret = avfilter_graph_create_filter(&yadif,
701  avfilter_get_by_name("yadif"),
702  name, "", NULL,
703  fg->graph)) < 0)
704  return ret;
705 
706  if ((ret = avfilter_link(last_filter, 0, yadif, 0)) < 0)
707  return ret;
708 
709  last_filter = yadif;
710  }
711 
712  snprintf(name, sizeof(name), "trim for input stream %d:%d",
713  ist->file_index, ist->st->index);
714  ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
715  AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
716  if (ret < 0)
717  return ret;
718 
719  if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
720  return ret;
721  return 0;
722 }
723 
724 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
725  AVFilterInOut *in)
726 {
727  AVFilterContext *last_filter;
728  const AVFilter *abuffer_filt = avfilter_get_by_name("abuffer");
729  InputStream *ist = ifilter->ist;
730  InputFile *f = input_files[ist->file_index];
731  AVBPrint args;
732  char name[255];
733  int ret, pad_idx = 0;
734 
735  if (ist->dec_ctx->codec_type != AVMEDIA_TYPE_AUDIO) {
736  av_log(NULL, AV_LOG_ERROR, "Cannot connect audio filter to non audio input\n");
737  return AVERROR(EINVAL);
738  }
739 
740  av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
741  av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
742  1, ist->dec_ctx->sample_rate,
743  ist->dec_ctx->sample_rate,
744  av_get_sample_fmt_name(ist->dec_ctx->sample_fmt));
745  if (ist->dec_ctx->channel_layout)
746  av_bprintf(&args, ":channel_layout=0x%"PRIx64,
747  ist->dec_ctx->channel_layout);
748  else
749  av_bprintf(&args, ":channels=%d", ist->dec_ctx->channels);
750  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
751  ist->file_index, ist->st->index);
752 
753  if ((ret = avfilter_graph_create_filter(&ifilter->filter, abuffer_filt,
754  name, args.str, NULL,
755  fg->graph)) < 0)
756  return ret;
757  last_filter = ifilter->filter;
758 
759 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
760  AVFilterContext *filt_ctx; \
761  \
762  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
763  "similarly to -af " filter_name "=%s.\n", arg); \
764  \
765  snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
766  fg->index, filter_name, ist->file_index, ist->st->index); \
767  ret = avfilter_graph_create_filter(&filt_ctx, \
768  avfilter_get_by_name(filter_name), \
769  name, arg, NULL, fg->graph); \
770  if (ret < 0) \
771  return ret; \
772  \
773  ret = avfilter_link(last_filter, 0, filt_ctx, 0); \
774  if (ret < 0) \
775  return ret; \
776  \
777  last_filter = filt_ctx; \
778 } while (0)
779 
780  if (audio_sync_method > 0) {
781  char args[256] = {0};
782 
783  av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
784  if (audio_drift_threshold != 0.1)
785  av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
786  if (!fg->reconfiguration)
787  av_strlcatf(args, sizeof(args), ":first_pts=0");
788  AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
789  }
790 
791 // if (ost->audio_channels_mapped) {
792 // int i;
793 // AVBPrint pan_buf;
794 // av_bprint_init(&pan_buf, 256, 8192);
795 // av_bprintf(&pan_buf, "0x%"PRIx64,
796 // av_get_default_channel_layout(ost->audio_channels_mapped));
797 // for (i = 0; i < ost->audio_channels_mapped; i++)
798 // if (ost->audio_channels_map[i] != -1)
799 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
800 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
801 // av_bprint_finalize(&pan_buf, NULL);
802 // }
803 
804  if (audio_volume != 256) {
805  char args[256];
806 
807  av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
808  "audio filter instead.\n");
809 
810  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
811  AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
812  }
813 
814  snprintf(name, sizeof(name), "trim for input stream %d:%d",
815  ist->file_index, ist->st->index);
816  ret = insert_trim(((f->start_time == AV_NOPTS_VALUE) || !f->accurate_seek) ?
817  AV_NOPTS_VALUE : 0, f->recording_time, &last_filter, &pad_idx, name);
818  if (ret < 0)
819  return ret;
820 
821  if ((ret = avfilter_link(last_filter, 0, in->filter_ctx, in->pad_idx)) < 0)
822  return ret;
823 
824  return 0;
825 }
826 
827 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
828  AVFilterInOut *in)
829 {
830  av_freep(&ifilter->name);
831  DESCRIBE_FILTER_LINK(ifilter, in, 1);
832 
833  if (!ifilter->ist->dec) {
834  av_log(NULL, AV_LOG_ERROR,
835  "No decoder for stream #%d:%d, filtering impossible\n",
836  ifilter->ist->file_index, ifilter->ist->st->index);
837  return AVERROR_DECODER_NOT_FOUND;
838  }
839  switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
840  case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
841  case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
842  default: av_assert0(0);
843  }
844 }
845 
846 int configure_filtergraph(FilterGraph *fg)
847 {
848  AVFilterInOut *inputs, *outputs, *cur;
849  int ret, i, init = !fg->graph, simple = !fg->graph_desc;
850  const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
851  fg->graph_desc;
852 
853  avfilter_graph_free(&fg->graph);
854  if (!(fg->graph = avfilter_graph_alloc()))
855  return AVERROR(ENOMEM);
856 
857  if (simple) {
858  OutputStream *ost = fg->outputs[0]->ost;
859  char args[512];
860  AVDictionaryEntry *e = NULL;
861 
862  snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
863  fg->graph->scale_sws_opts = av_strdup(args);
864 
865  args[0] = 0;
866  while ((e = av_dict_get(ost->swr_opts, "", e,
867  AV_DICT_IGNORE_SUFFIX))) {
868  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
869  }
870  if (strlen(args))
871  args[strlen(args)-1] = 0;
872  av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
873 
874  args[0] = '\0';
875  while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
876  AV_DICT_IGNORE_SUFFIX))) {
877  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
878  }
879  if (strlen(args))
880  args[strlen(args) - 1] = '\0';
881  fg->graph->resample_lavr_opts = av_strdup(args);
882 
883  e = av_dict_get(ost->encoder_opts, "threads", NULL, 0);
884  if (e)
885  av_opt_set(fg->graph, "threads", e->value, 0);
886  }
887 
888  if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
889  return ret;
890 
891  if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
892  av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
893  "exactly one input and output.\n", graph_desc);
894  return AVERROR(EINVAL);
895  }
896 
897  for (cur = inputs; !simple && init && cur; cur = cur->next)
898  init_input_filter(fg, cur);
899 
900  for (cur = inputs, i = 0; cur; cur = cur->next, i++)
901  if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0) {
902  avfilter_inout_free(&inputs);
903  avfilter_inout_free(&outputs);
904  return ret;
905  }
906  avfilter_inout_free(&inputs);
907 
908  if (!init || simple) {
909  /* we already know the mappings between lavfi outputs and output streams,
910  * so we can finish the setup */
911  for (cur = outputs, i = 0; cur; cur = cur->next, i++)
912  configure_output_filter(fg, fg->outputs[i], cur);
913  avfilter_inout_free(&outputs);
914 
915  if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
916  return ret;
917  } else {
918  /* wait until output mappings are processed */
919  for (cur = outputs; cur;) {
920  GROW_ARRAY(fg->outputs, fg->nb_outputs);
921  if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
922  exit_program(1);
923  fg->outputs[fg->nb_outputs - 1]->graph = fg;
924  fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
925  cur = cur->next;
926  fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
927  }
928  }
929 
930  fg->reconfiguration = 1;
931 
932  for (i = 0; i < fg->nb_outputs; i++) {
933  OutputStream *ost = fg->outputs[i]->ost;
934  if (ost &&
935  ost->enc->type == AVMEDIA_TYPE_AUDIO &&
936  !(ost->enc->capabilities & CODEC_CAP_VARIABLE_FRAME_SIZE))
937  av_buffersink_set_frame_size(ost->filter->filter,
938  ost->enc_ctx->frame_size);
939  }
940 
941  return 0;
942 }
943 
944 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
945 {
946  int i;
947  for (i = 0; i < fg->nb_inputs; i++)
948  if (fg->inputs[i]->ist == ist)
949  return 1;
950  return 0;
951 }
952 
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