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lavfi.c
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1 /*
2  * Copyright (c) 2011 Stefano Sabatini
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 /**
22  * @file
23  * libavfilter virtual input device
24  */
25 
26 /* #define DEBUG */
27 
28 #include <float.h> /* DBL_MIN, DBL_MAX */
29 
30 #include "libavutil/bprint.h"
32 #include "libavutil/file.h"
33 #include "libavutil/imgutils.h"
34 #include "libavutil/internal.h"
35 #include "libavutil/log.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/opt.h"
38 #include "libavutil/parseutils.h"
39 #include "libavutil/pixdesc.h"
40 #include "libavfilter/avfilter.h"
41 #include "libavfilter/buffersink.h"
43 #include "libavformat/internal.h"
44 #include "avdevice.h"
45 
46 typedef struct {
47  AVClass *class; ///< class for private options
48  char *graph_str;
50  char *dump_graph;
54  int *sink_eof;
58  int nb_sinks;
60 } LavfiContext;
61 
62 static int *create_all_formats(int n)
63 {
64  int i, j, *fmts, count = 0;
65 
66  for (i = 0; i < n; i++) {
68  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
69  count++;
70  }
71 
72  if (!(fmts = av_malloc((count+1) * sizeof(int))))
73  return NULL;
74  for (j = 0, i = 0; i < n; i++) {
76  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
77  fmts[j++] = i;
78  }
79  fmts[j] = -1;
80  return fmts;
81 }
82 
84 {
85  LavfiContext *lavfi = avctx->priv_data;
86 
87  av_freep(&lavfi->sink_stream_map);
88  av_freep(&lavfi->sink_eof);
89  av_freep(&lavfi->stream_sink_map);
91  av_freep(&lavfi->sinks);
92  avfilter_graph_free(&lavfi->graph);
94 
95  return 0;
96 }
97 
99 {
100  LavfiContext *lavfi = avctx->priv_data;
101  AVStream *st;
102  int stream_idx, sink_idx;
103 
104  for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
105  sink_idx = lavfi->stream_sink_map[stream_idx];
106  if (lavfi->sink_stream_subcc_map[sink_idx]) {
107  lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
108  if (!(st = avformat_new_stream(avctx, NULL)))
109  return AVERROR(ENOMEM);
112  } else {
113  lavfi->sink_stream_subcc_map[sink_idx] = -1;
114  }
115  }
116  return 0;
117 }
118 
120 {
121  LavfiContext *lavfi = avctx->priv_data;
122  AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
123  const AVFilter *buffersink, *abuffersink;
125  enum AVMediaType type;
126  int ret = 0, i, n;
127 
128 #define FAIL(ERR) { ret = ERR; goto end; }
129 
130  if (!pix_fmts)
131  FAIL(AVERROR(ENOMEM));
132 
133  buffersink = avfilter_get_by_name("buffersink");
134  abuffersink = avfilter_get_by_name("abuffersink");
135 
136  if (lavfi->graph_filename && lavfi->graph_str) {
137  av_log(avctx, AV_LOG_ERROR,
138  "Only one of the graph or graph_file options must be specified\n");
139  FAIL(AVERROR(EINVAL));
140  }
141 
142  if (lavfi->graph_filename) {
143  AVBPrint graph_file_pb;
144  AVIOContext *avio = NULL;
146  if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
147  goto end;
148  ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
149  av_dict_set(&options, "protocol_whitelist", NULL, 0);
150  if (ret < 0)
151  goto end;
152  av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
153  ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
154  avio_closep(&avio);
155  av_bprint_chars(&graph_file_pb, '\0', 1);
156  if (!ret && !av_bprint_is_complete(&graph_file_pb))
157  ret = AVERROR(ENOMEM);
158  if (ret) {
159  av_bprint_finalize(&graph_file_pb, NULL);
160  goto end;
161  }
162  if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
163  goto end;
164  }
165 
166  if (!lavfi->graph_str)
167  lavfi->graph_str = av_strdup(avctx->url);
168 
169  /* parse the graph, create a stream for each open output */
170  if (!(lavfi->graph = avfilter_graph_alloc()))
171  FAIL(AVERROR(ENOMEM));
172 
173  if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
174  &input_links, &output_links, avctx)) < 0)
175  goto end;
176 
177  if (input_links) {
178  av_log(avctx, AV_LOG_ERROR,
179  "Open inputs in the filtergraph are not acceptable\n");
180  FAIL(AVERROR(EINVAL));
181  }
182 
183  /* count the outputs */
184  for (n = 0, inout = output_links; inout; n++, inout = inout->next);
185  lavfi->nb_sinks = n;
186 
187  if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
188  FAIL(AVERROR(ENOMEM));
189  if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
190  FAIL(AVERROR(ENOMEM));
191  if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
192  FAIL(AVERROR(ENOMEM));
193  if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
194  FAIL(AVERROR(ENOMEM));
195 
196  for (i = 0; i < n; i++)
197  lavfi->stream_sink_map[i] = -1;
198 
199  /* parse the output link names - they need to be of the form out0, out1, ...
200  * create a mapping between them and the streams */
201  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
202  int stream_idx = 0, suffix = 0, use_subcc = 0;
203  sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
204  if (!suffix) {
205  av_log(avctx, AV_LOG_ERROR,
206  "Invalid outpad name '%s'\n", inout->name);
207  FAIL(AVERROR(EINVAL));
208  }
209  if (inout->name[suffix]) {
210  if (!strcmp(inout->name + suffix, "+subcc")) {
211  use_subcc = 1;
212  } else {
213  av_log(avctx, AV_LOG_ERROR,
214  "Invalid outpad suffix '%s'\n", inout->name);
215  FAIL(AVERROR(EINVAL));
216  }
217  }
218 
219  if ((unsigned)stream_idx >= n) {
220  av_log(avctx, AV_LOG_ERROR,
221  "Invalid index was specified in output '%s', "
222  "must be a non-negative value < %d\n",
223  inout->name, n);
224  FAIL(AVERROR(EINVAL));
225  }
226 
227  if (lavfi->stream_sink_map[stream_idx] != -1) {
228  av_log(avctx, AV_LOG_ERROR,
229  "An output with stream index %d was already specified\n",
230  stream_idx);
231  FAIL(AVERROR(EINVAL));
232  }
233  lavfi->sink_stream_map[i] = stream_idx;
234  lavfi->stream_sink_map[stream_idx] = i;
235  lavfi->sink_stream_subcc_map[i] = !!use_subcc;
236  }
237 
238  /* for each open output create a corresponding stream */
239  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
240  AVStream *st;
241  if (!(st = avformat_new_stream(avctx, NULL)))
242  FAIL(AVERROR(ENOMEM));
243  st->id = i;
244  }
245 
246  /* create a sink for each output and connect them to the graph */
247  lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
248  if (!lavfi->sinks)
249  FAIL(AVERROR(ENOMEM));
250 
251  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
252  AVFilterContext *sink;
253 
254  type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
255 
256  if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
257  type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
258  av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
260  }
261 
262  if (type == AVMEDIA_TYPE_VIDEO) {
263  ret = avfilter_graph_create_filter(&sink, buffersink,
264  inout->name, NULL,
265  NULL, lavfi->graph);
266  if (ret >= 0)
267  ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
268  if (ret < 0)
269  goto end;
270  } else if (type == AVMEDIA_TYPE_AUDIO) {
275  AV_SAMPLE_FMT_DBL, -1 };
276 
277  ret = avfilter_graph_create_filter(&sink, abuffersink,
278  inout->name, NULL,
279  NULL, lavfi->graph);
280  if (ret >= 0)
281  ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
282  if (ret < 0)
283  goto end;
284  ret = av_opt_set_int(sink, "all_channel_counts", 1,
286  if (ret < 0)
287  goto end;
288  } else {
289  av_log(avctx, AV_LOG_ERROR,
290  "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
291  FAIL(AVERROR(EINVAL));
292  }
293 
294  lavfi->sinks[i] = sink;
295  if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
296  goto end;
297  }
298 
299  /* configure the graph */
300  if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
301  goto end;
302 
303  if (lavfi->dump_graph) {
304  char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
305  fputs(dump, stderr);
306  fflush(stderr);
307  av_free(dump);
308  }
309 
310  /* fill each stream with the information in the corresponding sink */
311  for (i = 0; i < lavfi->nb_sinks; i++) {
312  AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
313  AVRational time_base = av_buffersink_get_time_base(sink);
314  AVStream *st = avctx->streams[i];
316  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
320  st->codecpar->width = av_buffersink_get_w(sink);
321  st->codecpar->height = av_buffersink_get_h(sink);
322  st ->sample_aspect_ratio =
324  avctx->probesize = FFMAX(avctx->probesize,
327  30);
328  } else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
334  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
335  av_log(avctx, AV_LOG_ERROR,
336  "Could not find PCM codec for sample format %s.\n",
338  }
339  }
340 
341  if ((ret = create_subcc_streams(avctx)) < 0)
342  goto end;
343 
344  if (!(lavfi->decoded_frame = av_frame_alloc()))
345  FAIL(AVERROR(ENOMEM));
346 
347 end:
348  av_free(pix_fmts);
349  avfilter_inout_free(&input_links);
350  avfilter_inout_free(&output_links);
351  if (ret < 0)
352  lavfi_read_close(avctx);
353  return ret;
354 }
355 
357  int sink_idx)
358 {
359  LavfiContext *lavfi = avctx->priv_data;
360  AVFrameSideData *sd;
361  int stream_idx, i, ret;
362 
363  if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
364  return 0;
365  for (i = 0; i < frame->nb_side_data; i++)
366  if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
367  break;
368  if (i >= frame->nb_side_data)
369  return 0;
370  sd = frame->side_data[i];
371  if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
372  return ret;
373  memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
374  lavfi->subcc_packet.stream_index = stream_idx;
375  lavfi->subcc_packet.pts = frame->pts;
376  lavfi->subcc_packet.pos = frame->pkt_pos;
377  return 0;
378 }
379 
381 {
382  LavfiContext *lavfi = avctx->priv_data;
383  double min_pts = DBL_MAX;
384  int stream_idx, min_pts_sink_idx = 0;
385  AVFrame *frame = lavfi->decoded_frame;
386  AVDictionary *frame_metadata;
387  int ret, i;
388  int size = 0;
389 
390  if (lavfi->subcc_packet.size) {
391  *pkt = lavfi->subcc_packet;
392  av_init_packet(&lavfi->subcc_packet);
393  lavfi->subcc_packet.size = 0;
394  lavfi->subcc_packet.data = NULL;
395  return pkt->size;
396  }
397 
398  /* iterate through all the graph sinks. Select the sink with the
399  * minimum PTS */
400  for (i = 0; i < lavfi->nb_sinks; i++) {
402  double d;
403  int ret;
404 
405  if (lavfi->sink_eof[i])
406  continue;
407 
408  ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
410  if (ret == AVERROR_EOF) {
411  ff_dlog(avctx, "EOF sink_idx:%d\n", i);
412  lavfi->sink_eof[i] = 1;
413  continue;
414  } else if (ret < 0)
415  return ret;
417  ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
418  av_frame_unref(frame);
419 
420  if (d < min_pts) {
421  min_pts = d;
422  min_pts_sink_idx = i;
423  }
424  }
425  if (min_pts == DBL_MAX)
426  return AVERROR_EOF;
427 
428  ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
429 
430  av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
431  stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
432 
433  if (frame->width /* FIXME best way of testing a video */) {
434  size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
435  if ((ret = av_new_packet(pkt, size)) < 0)
436  return ret;
437 
438  av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
439  frame->format, frame->width, frame->height, 1);
440  } else if (frame->channels /* FIXME test audio */) {
441  size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
442  frame->channels;
443  if ((ret = av_new_packet(pkt, size)) < 0)
444  return ret;
445  memcpy(pkt->data, frame->data[0], size);
446  }
447 
448  frame_metadata = frame->metadata;
449  if (frame_metadata) {
450  uint8_t *metadata;
451  AVDictionaryEntry *e = NULL;
452  AVBPrint meta_buf;
453 
455  while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
456  av_bprintf(&meta_buf, "%s", e->key);
457  av_bprint_chars(&meta_buf, '\0', 1);
458  av_bprintf(&meta_buf, "%s", e->value);
459  av_bprint_chars(&meta_buf, '\0', 1);
460  }
461  if (!av_bprint_is_complete(&meta_buf) ||
463  meta_buf.len))) {
464  av_bprint_finalize(&meta_buf, NULL);
465  return AVERROR(ENOMEM);
466  }
467  memcpy(metadata, meta_buf.str, meta_buf.len);
468  av_bprint_finalize(&meta_buf, NULL);
469  }
470 
471  if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
472  av_frame_unref(frame);
473  av_packet_unref(pkt);
474  return ret;
475  }
476 
477  pkt->stream_index = stream_idx;
478  pkt->pts = frame->pts;
479  pkt->pos = frame->pkt_pos;
480  pkt->size = size;
481  av_frame_unref(frame);
482  return size;
483 }
484 
485 #define OFFSET(x) offsetof(LavfiContext, x)
486 
487 #define DEC AV_OPT_FLAG_DECODING_PARAM
488 
489 static const AVOption options[] = {
490  { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
491  { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
492  { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
493  { NULL },
494 };
495 
496 static const AVClass lavfi_class = {
497  .class_name = "lavfi indev",
498  .item_name = av_default_item_name,
499  .option = options,
500  .version = LIBAVUTIL_VERSION_INT,
501  .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
502 };
503 
505  .name = "lavfi",
506  .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
507  .priv_data_size = sizeof(LavfiContext),
511  .flags = AVFMT_NOFILE,
512  .priv_class = &lavfi_class,
513 };
int64_t probesize
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1515
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:161
void av_bprintf(AVBPrint *buf, const char *fmt,...)
Definition: bprint.c:94
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2384
This structure describes decoded (raw) audio or video data.
Definition: frame.h:218
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1627
AVOption.
Definition: opt.h:246
int av_image_copy_to_buffer(uint8_t *dst, int dst_size, const uint8_t *const src_data[4], const int src_linesize[4], enum AVPixelFormat pix_fmt, int width, int height, int align)
Copy image data from an image into a buffer.
Definition: imgutils.c:453
int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:490
misc image utilities
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
Definition: avfiltergraph.c:83
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
Main libavfilter public API header.
Memory handling functions.
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1450
static av_cold int lavfi_read_close(AVFormatContext *avctx)
Definition: lavfi.c:83
void avpriv_set_pts_info(AVStream *s, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: utils.c:4827
const char * desc
Definition: nvenc.c:65
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
Check validity and configure all the links and formats in the graph.
void avfilter_inout_free(AVFilterInOut **inout)
Free the supplied list of AVFilterInOut and set *inout to NULL.
Definition: graphparser.c:203
AVRational sample_aspect_ratio
Video only.
Definition: avcodec.h:3960
#define av_opt_set_int_list(obj, name, val, term, flags)
Set a binary option to an integer list.
Definition: opt.h:708
int avio_read_to_bprint(AVIOContext *h, struct AVBPrint *pb, size_t max_size)
Read contents of h into print buffer, up to max_size bytes, or up to EOF.
Definition: aviobuf.c:1261
enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
Get the type of an AVFilterPad.
Definition: avfilter.c:1039
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3884
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:936
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1431
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:191
#define AVIO_FLAG_READ
read-only
Definition: avio.h:654
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:236
static AVPacket pkt
int * sink_eof
Definition: lavfi.c:54
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
Format I/O context.
Definition: avformat.h:1351
memory buffer sink API for audio and video
AVInputFormat ff_lavfi_demuxer
Definition: lavfi.c:504
const char * class_name
The name of the class; usually it is the same name as the context structure type to which the AVClass...
Definition: log.h:72
int av_buffersink_get_sample_rate(const AVFilterContext *ctx)
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:135
uint8_t
#define av_cold
Definition: attributes.h:82
#define av_malloc(s)
AV_SAMPLE_FMT_U8
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:189
int width
Video only.
Definition: avcodec.h:3950
AVOptions.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int id
Format-specific stream ID.
Definition: avformat.h:881
#define OFFSET(x)
Definition: lavfi.c:485
static const AVClass lavfi_class
Definition: lavfi.c:496
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:311
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4456
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1419
static AVFrame * frame
int avfilter_graph_create_filter(AVFilterContext **filt_ctx, const AVFilter *filt, const char *name, const char *args, void *opaque, AVFilterGraph *graph_ctx)
Create and add a filter instance into an existing graph.
Misc file utilities.
Structure to hold side data for an AVFrame.
Definition: frame.h:180
AVDictionaryEntry * av_dict_get(const AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:40
uint8_t * data
Definition: avcodec.h:1430
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1909
#define ff_dlog(a,...)
#define AVERROR_EOF
End of file.
Definition: error.h:55
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
AVDictionary * metadata
metadata.
Definition: frame.h:505
AVFrame * decoded_frame
Definition: lavfi.c:57
ptrdiff_t size
Definition: opengl_enc.c:101
int nb_sinks
Definition: lavfi.c:58
#define flags(name, subs,...)
Definition: cbs_h2645.c:263
int * sink_stream_map
Definition: lavfi.c:53
signed 32 bits
Definition: samplefmt.h:62
int nb_side_data
Definition: frame.h:431
int av_buffersink_get_h(const AVFilterContext *ctx)
int av_buffersink_get_format(const AVFilterContext *ctx)
AVFrameSideData ** side_data
Definition: frame.h:430
uint64_t channel_layout
Audio only.
Definition: avcodec.h:3986
#define av_log(a,...)
Main libavdevice API header.
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:86
int av_image_get_buffer_size(enum AVPixelFormat pix_fmt, int width, int height, int align)
Return the size in bytes of the amount of data required to store an image with the given parameters...
Definition: imgutils.c:431
const char * suffix
Definition: checkasm.c:182
int width
Definition: frame.h:276
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
char * dump_graph
Definition: lavfi.c:50
#define AV_BPRINT_SIZE_UNLIMITED
static int create_subcc_streams(AVFormatContext *avctx)
Definition: lavfi.c:98
#define AVERROR(e)
Definition: error.h:43
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:202
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
char * url
input or output URL.
Definition: avformat.h:1447
int av_get_padded_bits_per_pixel(const AVPixFmtDescriptor *pixdesc)
Return the number of bits per pixel for the pixel format described by pixdesc, including any padding ...
Definition: pixdesc.c:2349
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:58
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3880
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:561
Round to nearest and halfway cases away from zero.
Definition: mathematics.h:84
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:140
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
Definition: samplefmt.c:49
GLsizei count
Definition: opengl_enc.c:109
#define FFMAX(a, b)
Definition: common.h:94
int attribute_align_arg av_buffersink_get_frame_flags(AVFilterContext *ctx, AVFrame *frame, int flags)
Get a frame with filtered data from sink and put it in frame.
Definition: buffersink.c:119
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: allfilters.c:439
common internal API header
uint64_t flags
Combination of AV_PIX_FMT_FLAG_...
Definition: pixdesc.h:106
static av_cold int lavfi_read_header(AVFormatContext *avctx)
Definition: lavfi.c:119
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1407
int channels
number of audio channels, only used for audio.
Definition: frame.h:523
audio channel layout utility functions
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:556
int n
Definition: avisynth_c.h:684
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
AVFilterContext ** sinks
Definition: lavfi.c:52
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:530
Stream structure.
Definition: avformat.h:874
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:1003
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:291
AVRational av_buffersink_get_sample_aspect_ratio(const AVFilterContext *ctx)
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:251
A list of zero terminated key/value strings.
Definition: avcodec.h:1275
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:1473
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:249
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
uint64_t av_buffersink_get_channel_layout(const AVFilterContext *ctx)
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:592
uint8_t * data
Definition: frame.h:182
int * stream_sink_map
Definition: lavfi.c:55
GLint GLenum type
Definition: opengl_enc.c:105
int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)
Set the given entry in *pm, overwriting an existing entry.
Definition: dict.c:70
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
enum AVMediaType av_buffersink_get_type(const AVFilterContext *ctx)
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: lavfi.c:380
char * graph_filename
Definition: lavfi.c:49
AVMediaType
Definition: avutil.h:199
int avio_open2(AVIOContext **s, const char *url, int flags, const AVIOInterruptCB *int_cb, AVDictionary **options)
Create and initialize a AVIOContext for accessing the resource indicated by url.
Definition: aviobuf.c:1178
const char * name
Filter name.
Definition: avfilter.h:148
int av_buffersink_get_w(const AVFilterContext *ctx)
misc parsing utilities
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:266
#define FAIL(ERR)
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:551
enum AVFrameSideDataType type
Definition: frame.h:181
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:232
#define AVERROR_FILTER_NOT_FOUND
Filter not found.
Definition: error.h:58
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:106
int sample_rate
Audio only.
Definition: avcodec.h:3994
AVFilterGraph * graph
Definition: lavfi.c:51
static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame, int sink_idx)
Definition: lavfi.c:356
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:465
signed 16 bits
Definition: samplefmt.h:61
char * graph_str
Definition: lavfi.c:48
char * avfilter_graph_dump(AVFilterGraph *graph, const char *options)
Dump a graph into a human-readable string representation.
Definition: graphdump.c:154
void av_init_packet(AVPacket *pkt)
Initialize optional fields of a packet with default values.
Definition: avpacket.c:33
char * key
Definition: dict.h:86
int den
Denominator.
Definition: rational.h:60
static const AVOption options[]
Definition: lavfi.c:489
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
Definition: mathematics.h:108
#define AV_BUFFERSINK_FLAG_PEEK
Tell av_buffersink_get_buffer_ref() to read video/samples buffer reference, but not remove it from th...
Definition: buffersink.h:53
#define av_free(p)
char * value
Definition: dict.h:87
int av_buffersink_get_channels(const AVFilterContext *ctx)
void * priv_data
Format private data.
Definition: avformat.h:1379
int avfilter_graph_parse_ptr(AVFilterGraph *graph, const char *filters, AVFilterInOut **inputs, AVFilterInOut **outputs, void *log_ctx)
Add a graph described by a string to a graph.
Definition: graphparser.c:538
int channels
Audio only.
Definition: avcodec.h:3990
An instance of a filter.
Definition: avfilter.h:338
AVPacket subcc_packet
Definition: lavfi.c:59
number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of...
Definition: pixfmt.h:336
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
int height
Definition: frame.h:276
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:647
#define AV_DICT_IGNORE_SUFFIX
Return first entry in a dictionary whose first part corresponds to the search key, ignoring the suffix of the found key string.
Definition: dict.h:70
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:1021
#define av_malloc_array(a, b)
int64_t av_rescale_q_rnd(int64_t a, AVRational bq, AVRational cq, enum AVRounding rnd)
Rescale a 64-bit integer by 2 rational numbers with specified rounding.
Definition: mathematics.c:134
static int * create_all_formats(int n)
Definition: lavfi.c:62
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:329
int stream_index
Definition: avcodec.h:1432
int * sink_stream_subcc_map
Definition: lavfi.c:56
This structure stores compressed data.
Definition: avcodec.h:1407
int avio_closep(AVIOContext **s)
Close the resource accessed by the AVIOContext *s, free it and set the pointer pointing to it to NULL...
Definition: aviobuf.c:1215
AVRational av_buffersink_get_time_base(const AVFilterContext *ctx)
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:284
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1423
for(j=16;j >0;--j)
#define tb
Definition: regdef.h:68
#define DEC
Definition: lavfi.c:487
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140