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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/avfiltergraph.h"
25 #include "libavfilter/buffersink.h"
26 
27 #include "libavresample/avresample.h"
28 
29 #include "libavutil/avassert.h"
30 #include "libavutil/avstring.h"
31 #include "libavutil/bprint.h"
32 #include "libavutil/channel_layout.h"
33 #include "libavutil/opt.h"
34 #include "libavutil/pixdesc.h"
35 #include "libavutil/pixfmt.h"
36 #include "libavutil/imgutils.h"
37 #include "libavutil/samplefmt.h"
38 
39 enum AVPixelFormat choose_pixel_fmt(AVStream *st, AVCodec *codec, enum AVPixelFormat target)
40 {
41  if (codec && codec->pix_fmts) {
42  const enum AVPixelFormat *p = codec->pix_fmts;
43  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(target);
44  int has_alpha = desc ? desc->nb_components % 2 == 0 : 0;
45  enum AVPixelFormat best= AV_PIX_FMT_NONE;
46  if (st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
47  if (st->codec->codec_id == AV_CODEC_ID_MJPEG) {
48  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
49  } else if (st->codec->codec_id == AV_CODEC_ID_LJPEG) {
50  p = (const enum AVPixelFormat[]) { 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  }
54  for (; *p != AV_PIX_FMT_NONE; p++) {
55  best= avcodec_find_best_pix_fmt_of_2(best, *p, target, has_alpha, NULL);
56  if (*p == target)
57  break;
58  }
59  if (*p == AV_PIX_FMT_NONE) {
60  if (target != AV_PIX_FMT_NONE)
61  av_log(NULL, AV_LOG_WARNING,
62  "Incompatible pixel format '%s' for codec '%s', auto-selecting format '%s'\n",
63  av_get_pix_fmt_name(target),
64  codec->name,
65  av_get_pix_fmt_name(best));
66  return best;
67  }
68  }
69  return target;
70 }
71 
72 void choose_sample_fmt(AVStream *st, AVCodec *codec)
73 {
74  if (codec && codec->sample_fmts) {
75  const enum AVSampleFormat *p = codec->sample_fmts;
76  for (; *p != -1; p++) {
77  if (*p == st->codec->sample_fmt)
78  break;
79  }
80  if (*p == -1) {
81  if((codec->capabilities & CODEC_CAP_LOSSLESS) && av_get_sample_fmt_name(st->codec->sample_fmt) > av_get_sample_fmt_name(codec->sample_fmts[0]))
82  av_log(NULL, AV_LOG_ERROR, "Conversion will not be lossless.\n");
83  if(av_get_sample_fmt_name(st->codec->sample_fmt))
84  av_log(NULL, AV_LOG_WARNING,
85  "Incompatible sample format '%s' for codec '%s', auto-selecting format '%s'\n",
86  av_get_sample_fmt_name(st->codec->sample_fmt),
87  codec->name,
88  av_get_sample_fmt_name(codec->sample_fmts[0]));
89  st->codec->sample_fmt = codec->sample_fmts[0];
90  }
91  }
92 }
93 
94 static char *choose_pix_fmts(OutputStream *ost)
95 {
96  if (ost->keep_pix_fmt) {
97  if (ost->filter)
98  avfilter_graph_set_auto_convert(ost->filter->graph->graph,
99  AVFILTER_AUTO_CONVERT_NONE);
100  if (ost->st->codec->pix_fmt == AV_PIX_FMT_NONE)
101  return NULL;
102  return av_strdup(av_get_pix_fmt_name(ost->st->codec->pix_fmt));
103  }
104  if (ost->st->codec->pix_fmt != AV_PIX_FMT_NONE) {
105  return av_strdup(av_get_pix_fmt_name(choose_pixel_fmt(ost->st, ost->enc, ost->st->codec->pix_fmt)));
106  } else if (ost->enc && ost->enc->pix_fmts) {
107  const enum AVPixelFormat *p;
108  AVIOContext *s = NULL;
109  uint8_t *ret;
110  int len;
111 
112  if (avio_open_dyn_buf(&s) < 0)
113  exit(1);
114 
115  p = ost->enc->pix_fmts;
116  if (ost->st->codec->strict_std_compliance <= FF_COMPLIANCE_UNOFFICIAL) {
117  if (ost->st->codec->codec_id == AV_CODEC_ID_MJPEG) {
118  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_NONE };
119  } else if (ost->st->codec->codec_id == AV_CODEC_ID_LJPEG) {
120  p = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ422P, AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUV420P,
121  AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV444P, AV_PIX_FMT_BGRA, AV_PIX_FMT_NONE };
122  }
123  }
124 
125  for (; *p != AV_PIX_FMT_NONE; p++) {
126  const char *name = av_get_pix_fmt_name(*p);
127  avio_printf(s, "%s:", name);
128  }
129  len = avio_close_dyn_buf(s, &ret);
130  ret[len - 1] = 0;
131  return ret;
132  } else
133  return NULL;
134 }
135 
136 /* Define a function for building a string containing a list of
137  * allowed formats. */
138 #define DEF_CHOOSE_FORMAT(type, var, supported_list, none, get_name, separator)\
139 static char *choose_ ## var ## s(OutputStream *ost) \
140 { \
141  if (ost->st->codec->var != none) { \
142  get_name(ost->st->codec->var); \
143  return av_strdup(name); \
144  } else if (ost->enc && ost->enc->supported_list) { \
145  const type *p; \
146  AVIOContext *s = NULL; \
147  uint8_t *ret; \
148  int len; \
149  \
150  if (avio_open_dyn_buf(&s) < 0) \
151  exit(1); \
152  \
153  for (p = ost->enc->supported_list; *p != none; p++) { \
154  get_name(*p); \
155  avio_printf(s, "%s" separator, name); \
156  } \
157  len = avio_close_dyn_buf(s, &ret); \
158  ret[len - 1] = 0; \
159  return ret; \
160  } else \
161  return NULL; \
162 }
163 
164 // DEF_CHOOSE_FORMAT(enum AVPixelFormat, pix_fmt, pix_fmts, AV_PIX_FMT_NONE,
165 // GET_PIX_FMT_NAME, ":")
166 
167 DEF_CHOOSE_FORMAT(enum AVSampleFormat, sample_fmt, sample_fmts,
168  AV_SAMPLE_FMT_NONE, GET_SAMPLE_FMT_NAME, ",")
169 
170 DEF_CHOOSE_FORMAT(int, sample_rate, supported_samplerates, 0,
171  GET_SAMPLE_RATE_NAME, ",")
172 
173 DEF_CHOOSE_FORMAT(uint64_t, channel_layout, channel_layouts, 0,
174  GET_CH_LAYOUT_NAME, ",")
175 
176 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost)
177 {
178  FilterGraph *fg = av_mallocz(sizeof(*fg));
179 
180  if (!fg)
181  exit(1);
182  fg->index = nb_filtergraphs;
183 
184  GROW_ARRAY(fg->outputs, fg->nb_outputs);
185  if (!(fg->outputs[0] = av_mallocz(sizeof(*fg->outputs[0]))))
186  exit(1);
187  fg->outputs[0]->ost = ost;
188  fg->outputs[0]->graph = fg;
189 
190  ost->filter = fg->outputs[0];
191 
192  GROW_ARRAY(fg->inputs, fg->nb_inputs);
193  if (!(fg->inputs[0] = av_mallocz(sizeof(*fg->inputs[0]))))
194  exit(1);
195  fg->inputs[0]->ist = ist;
196  fg->inputs[0]->graph = fg;
197 
198  GROW_ARRAY(ist->filters, ist->nb_filters);
199  ist->filters[ist->nb_filters - 1] = fg->inputs[0];
200 
201  GROW_ARRAY(filtergraphs, nb_filtergraphs);
202  filtergraphs[nb_filtergraphs - 1] = fg;
203 
204  return fg;
205 }
206 
207 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
208 {
209  InputStream *ist = NULL;
210  enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx);
211  int i;
212 
213  // TODO: support other filter types
214  if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
215  av_log(NULL, AV_LOG_FATAL, "Only video and audio filters supported "
216  "currently.\n");
217  exit(1);
218  }
219 
220  if (in->name) {
221  AVFormatContext *s;
222  AVStream *st = NULL;
223  char *p;
224  int file_idx = strtol(in->name, &p, 0);
225 
226  if (file_idx < 0 || file_idx >= nb_input_files) {
227  av_log(NULL, AV_LOG_FATAL, "Invalid file index %d in filtergraph description %s.\n",
228  file_idx, fg->graph_desc);
229  exit(1);
230  }
231  s = input_files[file_idx]->ctx;
232 
233  for (i = 0; i < s->nb_streams; i++) {
234  enum AVMediaType stream_type = s->streams[i]->codec->codec_type;
235  if (stream_type != type &&
236  !(stream_type == AVMEDIA_TYPE_SUBTITLE &&
237  type == AVMEDIA_TYPE_VIDEO /* sub2video hack */))
238  continue;
239  if (check_stream_specifier(s, s->streams[i], *p == ':' ? p + 1 : p) == 1) {
240  st = s->streams[i];
241  break;
242  }
243  }
244  if (!st) {
245  av_log(NULL, AV_LOG_FATAL, "Stream specifier '%s' in filtergraph description %s "
246  "matches no streams.\n", p, fg->graph_desc);
247  exit(1);
248  }
249  ist = input_streams[input_files[file_idx]->ist_index + st->index];
250  } else {
251  /* find the first unused stream of corresponding type */
252  for (i = 0; i < nb_input_streams; i++) {
253  ist = input_streams[i];
254  if (ist->st->codec->codec_type == type && ist->discard)
255  break;
256  }
257  if (i == nb_input_streams) {
258  av_log(NULL, AV_LOG_FATAL, "Cannot find a matching stream for "
259  "unlabeled input pad %d on filter %s\n", in->pad_idx,
260  in->filter_ctx->name);
261  exit(1);
262  }
263  }
264  av_assert0(ist);
265 
266  ist->discard = 0;
267  ist->decoding_needed++;
268  ist->st->discard = AVDISCARD_NONE;
269 
270  GROW_ARRAY(fg->inputs, fg->nb_inputs);
271  if (!(fg->inputs[fg->nb_inputs - 1] = av_mallocz(sizeof(*fg->inputs[0]))))
272  exit(1);
273  fg->inputs[fg->nb_inputs - 1]->ist = ist;
274  fg->inputs[fg->nb_inputs - 1]->graph = fg;
275 
276  GROW_ARRAY(ist->filters, ist->nb_filters);
277  ist->filters[ist->nb_filters - 1] = fg->inputs[fg->nb_inputs - 1];
278 }
279 
280 static int configure_output_video_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
281 {
282  char *pix_fmts;
283  OutputStream *ost = ofilter->ost;
284  AVCodecContext *codec = ost->st->codec;
285  AVFilterContext *last_filter = out->filter_ctx;
286  int pad_idx = out->pad_idx;
287  int ret;
288  char name[255];
289  AVBufferSinkParams *buffersink_params = av_buffersink_params_alloc();
290 
291  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
292  ret = avfilter_graph_create_filter(&ofilter->filter,
293  avfilter_get_by_name("ffbuffersink"),
294  name, NULL, NULL, fg->graph);
295  av_freep(&buffersink_params);
296 
297  if (ret < 0)
298  return ret;
299 
300  if (codec->width || codec->height) {
301  char args[255];
302  AVFilterContext *filter;
303 
304  snprintf(args, sizeof(args), "%d:%d:flags=0x%X",
305  codec->width,
306  codec->height,
307  (unsigned)ost->sws_flags);
308  snprintf(name, sizeof(name), "scaler for output stream %d:%d",
309  ost->file_index, ost->index);
310  if ((ret = avfilter_graph_create_filter(&filter, avfilter_get_by_name("scale"),
311  name, args, NULL, fg->graph)) < 0)
312  return ret;
313  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
314  return ret;
315 
316  last_filter = filter;
317  pad_idx = 0;
318  }
319 
320  if ((pix_fmts = choose_pix_fmts(ost))) {
321  AVFilterContext *filter;
322  snprintf(name, sizeof(name), "pixel format for output stream %d:%d",
323  ost->file_index, ost->index);
324  if ((ret = avfilter_graph_create_filter(&filter,
325  avfilter_get_by_name("format"),
326  "format", pix_fmts, NULL,
327  fg->graph)) < 0)
328  return ret;
329  if ((ret = avfilter_link(last_filter, pad_idx, filter, 0)) < 0)
330  return ret;
331 
332  last_filter = filter;
333  pad_idx = 0;
334  av_freep(&pix_fmts);
335  }
336 
337  if (ost->frame_rate.num && 0) {
338  AVFilterContext *fps;
339  char args[255];
340 
341  snprintf(args, sizeof(args), "fps=%d/%d", ost->frame_rate.num,
342  ost->frame_rate.den);
343  snprintf(name, sizeof(name), "fps for output stream %d:%d",
344  ost->file_index, ost->index);
345  ret = avfilter_graph_create_filter(&fps, avfilter_get_by_name("fps"),
346  name, args, NULL, fg->graph);
347  if (ret < 0)
348  return ret;
349 
350  ret = avfilter_link(last_filter, pad_idx, fps, 0);
351  if (ret < 0)
352  return ret;
353  last_filter = fps;
354  pad_idx = 0;
355  }
356 
357  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
358  return ret;
359 
360  return 0;
361 }
362 
363 static int configure_output_audio_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
364 {
365  OutputStream *ost = ofilter->ost;
366  AVCodecContext *codec = ost->st->codec;
367  AVFilterContext *last_filter = out->filter_ctx;
368  int pad_idx = out->pad_idx;
369  char *sample_fmts, *sample_rates, *channel_layouts;
370  char name[255];
371  int ret;
372  AVABufferSinkParams *params = av_abuffersink_params_alloc();
373 
374  if (!params)
375  return AVERROR(ENOMEM);
376  params->all_channel_counts = 1;
377  snprintf(name, sizeof(name), "output stream %d:%d", ost->file_index, ost->index);
378  ret = avfilter_graph_create_filter(&ofilter->filter,
379  avfilter_get_by_name("ffabuffersink"),
380  name, NULL, params, fg->graph);
381  av_freep(&params);
382  if (ret < 0)
383  return ret;
384 
385 #define AUTO_INSERT_FILTER(opt_name, filter_name, arg) do { \
386  AVFilterContext *filt_ctx; \
387  \
388  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
389  "similarly to -af " filter_name "=%s.\n", arg); \
390  \
391  ret = avfilter_graph_create_filter(&filt_ctx, \
392  avfilter_get_by_name(filter_name), \
393  filter_name, arg, NULL, fg->graph); \
394  if (ret < 0) \
395  return ret; \
396  \
397  ret = avfilter_link(last_filter, pad_idx, filt_ctx, 0); \
398  if (ret < 0) \
399  return ret; \
400  \
401  last_filter = filt_ctx; \
402  pad_idx = 0; \
403 } while (0)
404  if (ost->audio_channels_mapped) {
405  int i;
406  AVBPrint pan_buf;
407  av_bprint_init(&pan_buf, 256, 8192);
408  av_bprintf(&pan_buf, "0x%"PRIx64,
409  av_get_default_channel_layout(ost->audio_channels_mapped));
410  for (i = 0; i < ost->audio_channels_mapped; i++)
411  if (ost->audio_channels_map[i] != -1)
412  av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
413 
414  AUTO_INSERT_FILTER("-map_channel", "pan", pan_buf.str);
415  av_bprint_finalize(&pan_buf, NULL);
416  }
417 
418  if (codec->channels && !codec->channel_layout)
419  codec->channel_layout = av_get_default_channel_layout(codec->channels);
420 
421  sample_fmts = choose_sample_fmts(ost);
422  sample_rates = choose_sample_rates(ost);
423  channel_layouts = choose_channel_layouts(ost);
424  if (sample_fmts || sample_rates || channel_layouts) {
425  AVFilterContext *format;
426  char args[256];
427  args[0] = 0;
428 
429  if (sample_fmts)
430  av_strlcatf(args, sizeof(args), "sample_fmts=%s:",
431  sample_fmts);
432  if (sample_rates)
433  av_strlcatf(args, sizeof(args), "sample_rates=%s:",
434  sample_rates);
435  if (channel_layouts)
436  av_strlcatf(args, sizeof(args), "channel_layouts=%s:",
437  channel_layouts);
438 
439  av_freep(&sample_fmts);
440  av_freep(&sample_rates);
441  av_freep(&channel_layouts);
442 
443  snprintf(name, sizeof(name), "audio format for output stream %d:%d",
444  ost->file_index, ost->index);
445  ret = avfilter_graph_create_filter(&format,
446  avfilter_get_by_name("aformat"),
447  name, args, NULL, fg->graph);
448  if (ret < 0)
449  return ret;
450 
451  ret = avfilter_link(last_filter, pad_idx, format, 0);
452  if (ret < 0)
453  return ret;
454 
455  last_filter = format;
456  pad_idx = 0;
457  }
458 
459  if (audio_volume != 256 && 0) {
460  char args[256];
461 
462  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
463  AUTO_INSERT_FILTER("-vol", "volume", args);
464  }
465 
466  if ((ret = avfilter_link(last_filter, pad_idx, ofilter->filter, 0)) < 0)
467  return ret;
468 
469  return 0;
470 }
471 
472 #define DESCRIBE_FILTER_LINK(f, inout, in) \
473 { \
474  AVFilterContext *ctx = inout->filter_ctx; \
475  AVFilterPad *pads = in ? ctx->input_pads : ctx->output_pads; \
476  int nb_pads = in ? ctx->input_count : ctx->output_count; \
477  AVIOContext *pb; \
478  \
479  if (avio_open_dyn_buf(&pb) < 0) \
480  exit(1); \
481  \
482  avio_printf(pb, "%s", ctx->filter->name); \
483  if (nb_pads > 1) \
484  avio_printf(pb, ":%s", avfilter_pad_get_name(pads, inout->pad_idx));\
485  avio_w8(pb, 0); \
486  avio_close_dyn_buf(pb, &f->name); \
487 }
488 
489 int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOut *out)
490 {
491  av_freep(&ofilter->name);
492  DESCRIBE_FILTER_LINK(ofilter, out, 0);
493 
494  switch (avfilter_pad_get_type(out->filter_ctx->output_pads, out->pad_idx)) {
495  case AVMEDIA_TYPE_VIDEO: return configure_output_video_filter(fg, ofilter, out);
496  case AVMEDIA_TYPE_AUDIO: return configure_output_audio_filter(fg, ofilter, out);
497  default: av_assert0(0);
498  }
499 }
500 
501 static int sub2video_prepare(InputStream *ist)
502 {
503  AVFormatContext *avf = input_files[ist->file_index]->ctx;
504  int i, ret, w, h;
505  uint8_t *image[4];
506  int linesize[4];
507 
508  /* Compute the size of the canvas for the subtitles stream.
509  If the subtitles codec has set a size, use it. Otherwise use the
510  maximum dimensions of the video streams in the same file. */
511  w = ist->st->codec->width;
512  h = ist->st->codec->height;
513  if (!(w && h)) {
514  for (i = 0; i < avf->nb_streams; i++) {
515  if (avf->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
516  w = FFMAX(w, avf->streams[i]->codec->width);
517  h = FFMAX(h, avf->streams[i]->codec->height);
518  }
519  }
520  if (!(w && h)) {
521  w = FFMAX(w, 720);
522  h = FFMAX(h, 576);
523  }
524  av_log(avf, AV_LOG_INFO, "sub2video: using %dx%d canvas\n", w, h);
525  }
526  ist->sub2video.w = ist->st->codec->width = ist->resample_width = w;
527  ist->sub2video.h = ist->st->codec->height = ist->resample_height = h;
528 
529  /* rectangles are AV_PIX_FMT_PAL8, but we have no guarantee that the
530  palettes for all rectangles are identical or compatible */
531  ist->resample_pix_fmt = ist->st->codec->pix_fmt = AV_PIX_FMT_RGB32;
532 
533  ret = av_image_alloc(image, linesize, w, h, AV_PIX_FMT_RGB32, 32);
534  if (ret < 0)
535  return ret;
536  memset(image[0], 0, h * linesize[0]);
537  ist->sub2video.ref = avfilter_get_video_buffer_ref_from_arrays(
538  image, linesize, AV_PERM_READ | AV_PERM_PRESERVE,
539  w, h, AV_PIX_FMT_RGB32);
540  if (!ist->sub2video.ref) {
541  av_free(image[0]);
542  return AVERROR(ENOMEM);
543  }
544  return 0;
545 }
546 
547 static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
548  AVFilterInOut *in)
549 {
550  AVFilterContext *first_filter = in->filter_ctx;
551  AVFilter *filter = avfilter_get_by_name("buffer");
552  InputStream *ist = ifilter->ist;
553  AVRational tb = ist->framerate.num ? av_inv_q(ist->framerate) :
554  ist->st->time_base;
555  AVRational fr = ist->framerate.num ? ist->framerate :
556  ist->st->r_frame_rate;
557  AVRational sar;
558  AVBPrint args;
559  char name[255];
560  int pad_idx = in->pad_idx;
561  int ret;
562 
563  if (!ist->framerate.num && ist->st->codec->ticks_per_frame>1) {
564  AVRational codec_fr = av_inv_q(ist->st->codec->time_base);
565  AVRational avg_fr = ist->st->avg_frame_rate;
566  codec_fr.den *= ist->st->codec->ticks_per_frame;
567  if ( codec_fr.num>0 && codec_fr.den>0 && av_q2d(codec_fr) < av_q2d(fr)*0.7
568  && fabs(1.0 - av_q2d(av_div_q(avg_fr, fr)))>0.1)
569  fr = codec_fr;
570  }
571 
572  if (ist->st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE) {
573  ret = sub2video_prepare(ist);
574  if (ret < 0)
575  return ret;
576  }
577 
578  sar = ist->st->sample_aspect_ratio.num ?
579  ist->st->sample_aspect_ratio :
580  ist->st->codec->sample_aspect_ratio;
581  if(!sar.den)
582  sar = (AVRational){0,1};
583  av_bprint_init(&args, 0, 1);
584  av_bprintf(&args,
585  "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:"
586  "pixel_aspect=%d/%d:sws_param=flags=%d", ist->resample_width,
587  ist->resample_height, ist->resample_pix_fmt,
588  tb.num, tb.den, sar.num, sar.den,
589  SWS_BILINEAR + ((ist->st->codec->flags&CODEC_FLAG_BITEXACT) ? SWS_BITEXACT:0));
590  if (fr.num && fr.den)
591  av_bprintf(&args, ":frame_rate=%d/%d", fr.num, fr.den);
592  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
593  ist->file_index, ist->st->index);
594 
595  if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter, name,
596  args.str, NULL, fg->graph)) < 0)
597  return ret;
598 
599  if (ist->framerate.num) {
600  AVFilterContext *setpts;
601 
602  snprintf(name, sizeof(name), "force CFR for input from stream %d:%d",
603  ist->file_index, ist->st->index);
604  if ((ret = avfilter_graph_create_filter(&setpts,
605  avfilter_get_by_name("setpts"),
606  name, "N", NULL,
607  fg->graph)) < 0)
608  return ret;
609 
610  if ((ret = avfilter_link(setpts, 0, first_filter, pad_idx)) < 0)
611  return ret;
612 
613  first_filter = setpts;
614  pad_idx = 0;
615  }
616 
617  if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
618  return ret;
619  return 0;
620 }
621 
622 static int configure_input_audio_filter(FilterGraph *fg, InputFilter *ifilter,
623  AVFilterInOut *in)
624 {
625  AVFilterContext *first_filter = in->filter_ctx;
626  AVFilter *filter = avfilter_get_by_name("abuffer");
627  InputStream *ist = ifilter->ist;
628  int pad_idx = in->pad_idx;
629  AVBPrint args;
630  char name[255];
631  int ret;
632 
633  av_bprint_init(&args, 0, AV_BPRINT_SIZE_AUTOMATIC);
634  av_bprintf(&args, "time_base=%d/%d:sample_rate=%d:sample_fmt=%s",
635  1, ist->st->codec->sample_rate,
636  ist->st->codec->sample_rate,
637  av_get_sample_fmt_name(ist->st->codec->sample_fmt));
638  if (ist->st->codec->channel_layout)
639  av_bprintf(&args, ":channel_layout=0x%"PRIx64,
640  ist->st->codec->channel_layout);
641  else
642  av_bprintf(&args, ":channels=%d", ist->st->codec->channels);
643  snprintf(name, sizeof(name), "graph %d input from stream %d:%d", fg->index,
644  ist->file_index, ist->st->index);
645 
646  if ((ret = avfilter_graph_create_filter(&ifilter->filter, filter,
647  name, args.str, NULL,
648  fg->graph)) < 0)
649  return ret;
650 
651 #define AUTO_INSERT_FILTER_INPUT(opt_name, filter_name, arg) do { \
652  AVFilterContext *filt_ctx; \
653  \
654  av_log(NULL, AV_LOG_INFO, opt_name " is forwarded to lavfi " \
655  "similarly to -af " filter_name "=%s.\n", arg); \
656  \
657  snprintf(name, sizeof(name), "graph %d %s for input stream %d:%d", \
658  fg->index, filter_name, ist->file_index, ist->st->index); \
659  ret = avfilter_graph_create_filter(&filt_ctx, \
660  avfilter_get_by_name(filter_name), \
661  name, arg, NULL, fg->graph); \
662  if (ret < 0) \
663  return ret; \
664  \
665  ret = avfilter_link(filt_ctx, 0, first_filter, pad_idx); \
666  if (ret < 0) \
667  return ret; \
668  \
669  first_filter = filt_ctx; \
670 } while (0)
671 
672  if (audio_sync_method > 0) {
673  char args[256] = {0};
674 
675  av_strlcatf(args, sizeof(args), "async=%d", audio_sync_method);
676  if (audio_drift_threshold != 0.1)
677  av_strlcatf(args, sizeof(args), ":min_hard_comp=%f", audio_drift_threshold);
678  if (!fg->reconfiguration)
679  av_strlcatf(args, sizeof(args), ":first_pts=0");
680  AUTO_INSERT_FILTER_INPUT("-async", "aresample", args);
681  }
682 
683 // if (ost->audio_channels_mapped) {
684 // int i;
685 // AVBPrint pan_buf;
686 // av_bprint_init(&pan_buf, 256, 8192);
687 // av_bprintf(&pan_buf, "0x%"PRIx64,
688 // av_get_default_channel_layout(ost->audio_channels_mapped));
689 // for (i = 0; i < ost->audio_channels_mapped; i++)
690 // if (ost->audio_channels_map[i] != -1)
691 // av_bprintf(&pan_buf, ":c%d=c%d", i, ost->audio_channels_map[i]);
692 // AUTO_INSERT_FILTER_INPUT("-map_channel", "pan", pan_buf.str);
693 // av_bprint_finalize(&pan_buf, NULL);
694 // }
695 
696  if (audio_volume != 256) {
697  char args[256];
698 
699  av_log(NULL, AV_LOG_WARNING, "-vol has been deprecated. Use the volume "
700  "audio filter instead.\n");
701 
702  snprintf(args, sizeof(args), "%f", audio_volume / 256.);
703  AUTO_INSERT_FILTER_INPUT("-vol", "volume", args);
704  }
705  if ((ret = avfilter_link(ifilter->filter, 0, first_filter, pad_idx)) < 0)
706  return ret;
707 
708  return 0;
709 }
710 
711 static int configure_input_filter(FilterGraph *fg, InputFilter *ifilter,
712  AVFilterInOut *in)
713 {
714  av_freep(&ifilter->name);
715  DESCRIBE_FILTER_LINK(ifilter, in, 1);
716 
717  switch (avfilter_pad_get_type(in->filter_ctx->input_pads, in->pad_idx)) {
718  case AVMEDIA_TYPE_VIDEO: return configure_input_video_filter(fg, ifilter, in);
719  case AVMEDIA_TYPE_AUDIO: return configure_input_audio_filter(fg, ifilter, in);
720  default: av_assert0(0);
721  }
722 }
723 
724 int configure_filtergraph(FilterGraph *fg)
725 {
726  AVFilterInOut *inputs, *outputs, *cur;
727  int ret, i, init = !fg->graph, simple = !fg->graph_desc;
728  const char *graph_desc = simple ? fg->outputs[0]->ost->avfilter :
729  fg->graph_desc;
730 
731  avfilter_graph_free(&fg->graph);
732  if (!(fg->graph = avfilter_graph_alloc()))
733  return AVERROR(ENOMEM);
734 
735  if (simple) {
736  OutputStream *ost = fg->outputs[0]->ost;
737  char args[512];
738  AVDictionaryEntry *e = NULL;
739 
740  snprintf(args, sizeof(args), "flags=0x%X", (unsigned)ost->sws_flags);
741  fg->graph->scale_sws_opts = av_strdup(args);
742 
743  args[0] = 0;
744  while ((e = av_dict_get(ost->swr_opts, "", e,
745  AV_DICT_IGNORE_SUFFIX))) {
746  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
747  }
748  if (strlen(args))
749  args[strlen(args)-1] = 0;
750  av_opt_set(fg->graph, "aresample_swr_opts", args, 0);
751 
752  args[0] = '\0';
753  while ((e = av_dict_get(fg->outputs[0]->ost->resample_opts, "", e,
754  AV_DICT_IGNORE_SUFFIX))) {
755  av_strlcatf(args, sizeof(args), "%s=%s:", e->key, e->value);
756  }
757  if (strlen(args))
758  args[strlen(args) - 1] = '\0';
759  fg->graph->resample_lavr_opts = av_strdup(args);
760  }
761 
762  if ((ret = avfilter_graph_parse2(fg->graph, graph_desc, &inputs, &outputs)) < 0)
763  return ret;
764 
765  if (simple && (!inputs || inputs->next || !outputs || outputs->next)) {
766  av_log(NULL, AV_LOG_ERROR, "Simple filtergraph '%s' does not have "
767  "exactly one input and output.\n", graph_desc);
768  return AVERROR(EINVAL);
769  }
770 
771  for (cur = inputs; !simple && init && cur; cur = cur->next)
772  init_input_filter(fg, cur);
773 
774  for (cur = inputs, i = 0; cur; cur = cur->next, i++)
775  if ((ret = configure_input_filter(fg, fg->inputs[i], cur)) < 0)
776  return ret;
777  avfilter_inout_free(&inputs);
778 
779  if (!init || simple) {
780  /* we already know the mappings between lavfi outputs and output streams,
781  * so we can finish the setup */
782  for (cur = outputs, i = 0; cur; cur = cur->next, i++)
783  configure_output_filter(fg, fg->outputs[i], cur);
784  avfilter_inout_free(&outputs);
785 
786  if ((ret = avfilter_graph_config(fg->graph, NULL)) < 0)
787  return ret;
788  } else {
789  /* wait until output mappings are processed */
790  for (cur = outputs; cur;) {
791  GROW_ARRAY(fg->outputs, fg->nb_outputs);
792  if (!(fg->outputs[fg->nb_outputs - 1] = av_mallocz(sizeof(*fg->outputs[0]))))
793  exit(1);
794  fg->outputs[fg->nb_outputs - 1]->graph = fg;
795  fg->outputs[fg->nb_outputs - 1]->out_tmp = cur;
796  cur = cur->next;
797  fg->outputs[fg->nb_outputs - 1]->out_tmp->next = NULL;
798  }
799  }
800 
801  fg->reconfiguration = 1;
802  return 0;
803 }
804 
805 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist)
806 {
807  int i;
808  for (i = 0; i < fg->nb_inputs; i++)
809  if (fg->inputs[i]->ist == ist)
810  return 1;
811  return 0;
812 }
813 
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