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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"
42 #include "libavfilter/buffersink.h"
44 #include "libavformat/internal.h"
45 #include "avdevice.h"
46 
47 typedef struct {
48  AVClass *class; ///< class for private options
49  char *graph_str;
51  char *dump_graph;
55  int *sink_eof;
59  int nb_sinks;
61 } LavfiContext;
62 
63 static int *create_all_formats(int n)
64 {
65  int i, j, *fmts, count = 0;
66 
67  for (i = 0; i < n; i++) {
69  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
70  count++;
71  }
72 
73  if (!(fmts = av_malloc((count+1) * sizeof(int))))
74  return NULL;
75  for (j = 0, i = 0; i < n; i++) {
77  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
78  fmts[j++] = i;
79  }
80  fmts[j] = -1;
81  return fmts;
82 }
83 
85 {
86  LavfiContext *lavfi = avctx->priv_data;
87 
88  av_freep(&lavfi->sink_stream_map);
89  av_freep(&lavfi->sink_eof);
90  av_freep(&lavfi->stream_sink_map);
92  av_freep(&lavfi->sinks);
93  avfilter_graph_free(&lavfi->graph);
95 
96  return 0;
97 }
98 
100 {
101  LavfiContext *lavfi = avctx->priv_data;
102  AVStream *st;
103  int stream_idx, sink_idx;
104 
105  for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
106  sink_idx = lavfi->stream_sink_map[stream_idx];
107  if (lavfi->sink_stream_subcc_map[sink_idx]) {
108  lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
109  if (!(st = avformat_new_stream(avctx, NULL)))
110  return AVERROR(ENOMEM);
113  } else {
114  lavfi->sink_stream_subcc_map[sink_idx] = -1;
115  }
116  }
117  return 0;
118 }
119 
121 {
122  LavfiContext *lavfi = avctx->priv_data;
123  AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
124  AVFilter *buffersink, *abuffersink;
126  enum AVMediaType type;
127  int ret = 0, i, n;
128 
129 #define FAIL(ERR) { ret = ERR; goto end; }
130 
131  if (!pix_fmts)
132  FAIL(AVERROR(ENOMEM));
133 
135 
136  buffersink = avfilter_get_by_name("buffersink");
137  abuffersink = avfilter_get_by_name("abuffersink");
138 
139  if (lavfi->graph_filename && lavfi->graph_str) {
140  av_log(avctx, AV_LOG_ERROR,
141  "Only one of the graph or graph_file options must be specified\n");
142  FAIL(AVERROR(EINVAL));
143  }
144 
145  if (lavfi->graph_filename) {
146  AVBPrint graph_file_pb;
147  AVIOContext *avio = NULL;
149  if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
150  goto end;
151  ret = avio_open2(&avio, lavfi->graph_filename, AVIO_FLAG_READ, &avctx->interrupt_callback, &options);
152  av_dict_set(&options, "protocol_whitelist", NULL, 0);
153  if (ret < 0)
154  goto end;
155  av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
156  ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
157  avio_closep(&avio);
158  av_bprint_chars(&graph_file_pb, '\0', 1);
159  if (!ret && !av_bprint_is_complete(&graph_file_pb))
160  ret = AVERROR(ENOMEM);
161  if (ret) {
162  av_bprint_finalize(&graph_file_pb, NULL);
163  goto end;
164  }
165  if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
166  goto end;
167  }
168 
169  if (!lavfi->graph_str)
170  lavfi->graph_str = av_strdup(avctx->filename);
171 
172  /* parse the graph, create a stream for each open output */
173  if (!(lavfi->graph = avfilter_graph_alloc()))
174  FAIL(AVERROR(ENOMEM));
175 
176  if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
177  &input_links, &output_links, avctx)) < 0)
178  goto end;
179 
180  if (input_links) {
181  av_log(avctx, AV_LOG_ERROR,
182  "Open inputs in the filtergraph are not acceptable\n");
183  FAIL(AVERROR(EINVAL));
184  }
185 
186  /* count the outputs */
187  for (n = 0, inout = output_links; inout; n++, inout = inout->next);
188  lavfi->nb_sinks = n;
189 
190  if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
191  FAIL(AVERROR(ENOMEM));
192  if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
193  FAIL(AVERROR(ENOMEM));
194  if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
195  FAIL(AVERROR(ENOMEM));
196  if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
197  FAIL(AVERROR(ENOMEM));
198 
199  for (i = 0; i < n; i++)
200  lavfi->stream_sink_map[i] = -1;
201 
202  /* parse the output link names - they need to be of the form out0, out1, ...
203  * create a mapping between them and the streams */
204  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
205  int stream_idx = 0, suffix = 0, use_subcc = 0;
206  sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
207  if (!suffix) {
208  av_log(avctx, AV_LOG_ERROR,
209  "Invalid outpad name '%s'\n", inout->name);
210  FAIL(AVERROR(EINVAL));
211  }
212  if (inout->name[suffix]) {
213  if (!strcmp(inout->name + suffix, "+subcc")) {
214  use_subcc = 1;
215  } else {
216  av_log(avctx, AV_LOG_ERROR,
217  "Invalid outpad suffix '%s'\n", inout->name);
218  FAIL(AVERROR(EINVAL));
219  }
220  }
221 
222  if ((unsigned)stream_idx >= n) {
223  av_log(avctx, AV_LOG_ERROR,
224  "Invalid index was specified in output '%s', "
225  "must be a non-negative value < %d\n",
226  inout->name, n);
227  FAIL(AVERROR(EINVAL));
228  }
229 
230  if (lavfi->stream_sink_map[stream_idx] != -1) {
231  av_log(avctx, AV_LOG_ERROR,
232  "An output with stream index %d was already specified\n",
233  stream_idx);
234  FAIL(AVERROR(EINVAL));
235  }
236  lavfi->sink_stream_map[i] = stream_idx;
237  lavfi->stream_sink_map[stream_idx] = i;
238  lavfi->sink_stream_subcc_map[i] = !!use_subcc;
239  }
240 
241  /* for each open output create a corresponding stream */
242  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
243  AVStream *st;
244  if (!(st = avformat_new_stream(avctx, NULL)))
245  FAIL(AVERROR(ENOMEM));
246  st->id = i;
247  }
248 
249  /* create a sink for each output and connect them to the graph */
250  lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
251  if (!lavfi->sinks)
252  FAIL(AVERROR(ENOMEM));
253 
254  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
255  AVFilterContext *sink;
256 
257  type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
258 
259  if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
260  type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
261  av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
263  }
264 
265  if (type == AVMEDIA_TYPE_VIDEO) {
266  ret = avfilter_graph_create_filter(&sink, buffersink,
267  inout->name, NULL,
268  NULL, lavfi->graph);
269  if (ret >= 0)
270  ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
271  if (ret < 0)
272  goto end;
273  } else if (type == AVMEDIA_TYPE_AUDIO) {
278  AV_SAMPLE_FMT_DBL, -1 };
279 
280  ret = avfilter_graph_create_filter(&sink, abuffersink,
281  inout->name, NULL,
282  NULL, lavfi->graph);
283  if (ret >= 0)
284  ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
285  if (ret < 0)
286  goto end;
287  ret = av_opt_set_int(sink, "all_channel_counts", 1,
289  if (ret < 0)
290  goto end;
291  } else {
292  av_log(avctx, AV_LOG_ERROR,
293  "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
294  FAIL(AVERROR(EINVAL));
295  }
296 
297  lavfi->sinks[i] = sink;
298  if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
299  goto end;
300  }
301 
302  /* configure the graph */
303  if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
304  goto end;
305 
306  if (lavfi->dump_graph) {
307  char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
308  fputs(dump, stderr);
309  fflush(stderr);
310  av_free(dump);
311  }
312 
313  /* fill each stream with the information in the corresponding sink */
314  for (i = 0; i < lavfi->nb_sinks; i++) {
315  AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
316  AVStream *st = avctx->streams[i];
317  st->codecpar->codec_type = link->type;
318  avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
319  if (link->type == AVMEDIA_TYPE_VIDEO) {
321  st->codecpar->format = link->format;
322  st->codecpar->width = link->w;
323  st->codecpar->height = link->h;
324  st ->sample_aspect_ratio =
326  avctx->probesize = FFMAX(avctx->probesize,
327  link->w * link->h *
329  30);
330  } else if (link->type == AVMEDIA_TYPE_AUDIO) {
331  st->codecpar->codec_id = av_get_pcm_codec(link->format, -1);
333  st->codecpar->format = link->format;
334  st->codecpar->sample_rate = link->sample_rate;
336  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
337  av_log(avctx, AV_LOG_ERROR,
338  "Could not find PCM codec for sample format %s.\n",
340  }
341  }
342 
343  if ((ret = create_subcc_streams(avctx)) < 0)
344  goto end;
345 
346  if (!(lavfi->decoded_frame = av_frame_alloc()))
347  FAIL(AVERROR(ENOMEM));
348 
349 end:
350  av_free(pix_fmts);
351  avfilter_inout_free(&input_links);
352  avfilter_inout_free(&output_links);
353  if (ret < 0)
354  lavfi_read_close(avctx);
355  return ret;
356 }
357 
359  int sink_idx)
360 {
361  LavfiContext *lavfi = avctx->priv_data;
362  AVFrameSideData *sd;
363  int stream_idx, i, ret;
364 
365  if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
366  return 0;
367  for (i = 0; i < frame->nb_side_data; i++)
368  if (frame->side_data[i]->type == AV_FRAME_DATA_A53_CC)
369  break;
370  if (i >= frame->nb_side_data)
371  return 0;
372  sd = frame->side_data[i];
373  if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
374  return ret;
375  memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
376  lavfi->subcc_packet.stream_index = stream_idx;
377  lavfi->subcc_packet.pts = frame->pts;
378  lavfi->subcc_packet.pos = av_frame_get_pkt_pos(frame);
379  return 0;
380 }
381 
383 {
384  LavfiContext *lavfi = avctx->priv_data;
385  double min_pts = DBL_MAX;
386  int stream_idx, min_pts_sink_idx = 0;
387  AVFrame *frame = lavfi->decoded_frame;
388  AVDictionary *frame_metadata;
389  int ret, i;
390  int size = 0;
391 
392  if (lavfi->subcc_packet.size) {
393  *pkt = lavfi->subcc_packet;
394  av_init_packet(&lavfi->subcc_packet);
395  lavfi->subcc_packet.size = 0;
396  lavfi->subcc_packet.data = NULL;
397  return pkt->size;
398  }
399 
400  /* iterate through all the graph sinks. Select the sink with the
401  * minimum PTS */
402  for (i = 0; i < lavfi->nb_sinks; i++) {
403  AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
404  double d;
405  int ret;
406 
407  if (lavfi->sink_eof[i])
408  continue;
409 
410  ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
412  if (ret == AVERROR_EOF) {
413  ff_dlog(avctx, "EOF sink_idx:%d\n", i);
414  lavfi->sink_eof[i] = 1;
415  continue;
416  } else if (ret < 0)
417  return ret;
419  ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
420  av_frame_unref(frame);
421 
422  if (d < min_pts) {
423  min_pts = d;
424  min_pts_sink_idx = i;
425  }
426  }
427  if (min_pts == DBL_MAX)
428  return AVERROR_EOF;
429 
430  ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
431 
432  av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
433  stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
434 
435  if (frame->width /* FIXME best way of testing a video */) {
436  size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
437  if ((ret = av_new_packet(pkt, size)) < 0)
438  return ret;
439 
440  av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
441  frame->format, frame->width, frame->height, 1);
442  } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
443  size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
444  av_frame_get_channels(frame);
445  if ((ret = av_new_packet(pkt, size)) < 0)
446  return ret;
447  memcpy(pkt->data, frame->data[0], size);
448  }
449 
450  frame_metadata = av_frame_get_metadata(frame);
451  if (frame_metadata) {
452  uint8_t *metadata;
453  AVDictionaryEntry *e = NULL;
454  AVBPrint meta_buf;
455 
457  while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
458  av_bprintf(&meta_buf, "%s", e->key);
459  av_bprint_chars(&meta_buf, '\0', 1);
460  av_bprintf(&meta_buf, "%s", e->value);
461  av_bprint_chars(&meta_buf, '\0', 1);
462  }
463  if (!av_bprint_is_complete(&meta_buf) ||
465  meta_buf.len))) {
466  av_bprint_finalize(&meta_buf, NULL);
467  return AVERROR(ENOMEM);
468  }
469  memcpy(metadata, meta_buf.str, meta_buf.len);
470  av_bprint_finalize(&meta_buf, NULL);
471  }
472 
473  if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
474  av_frame_unref(frame);
475  av_packet_unref(pkt);
476  return ret;
477  }
478 
479  pkt->stream_index = stream_idx;
480  pkt->pts = frame->pts;
481  pkt->pos = av_frame_get_pkt_pos(frame);
482  pkt->size = size;
483  av_frame_unref(frame);
484  return size;
485 }
486 
487 #define OFFSET(x) offsetof(LavfiContext, x)
488 
489 #define DEC AV_OPT_FLAG_DECODING_PARAM
490 
491 static const AVOption options[] = {
492  { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
493  { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
494  { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
495  { NULL },
496 };
497 
498 static const AVClass lavfi_class = {
499  .class_name = "lavfi indev",
500  .item_name = av_default_item_name,
501  .option = options,
502  .version = LIBAVUTIL_VERSION_INT,
503  .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
504 };
505 
507  .name = "lavfi",
508  .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
509  .priv_data_size = sizeof(LavfiContext),
513  .flags = AVFMT_NOFILE,
514  .priv_class = &lavfi_class,
515 };
int64_t probesize
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1472
#define NULL
Definition: coverity.c:32
Bytestream IO Context.
Definition: avio.h:147
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:2266
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1584
AVOption.
Definition: opt.h:245
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:383
misc image utilities
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
Definition: avfiltergraph.c:76
#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:1620
static av_cold int lavfi_read_close(AVFormatContext *avctx)
Definition: lavfi.c:84
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:4549
const char * desc
Definition: nvenc.c:101
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:187
AVRational sample_aspect_ratio
Video only.
Definition: avcodec.h:4055
#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:1138
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:3979
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:948
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1601
#define AVIO_FLAG_READ
read-only
Definition: avio.h:606
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:252
static AVPacket pkt
int * sink_eof
Definition: lavfi.c:55
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
Format I/O context.
Definition: avformat.h:1330
memory buffer sink API for audio and video
AVInputFormat ff_lavfi_demuxer
Definition: lavfi.c:506
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
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:315
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:133
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:141
int width
Video only.
Definition: avcodec.h:4045
AVOptions.
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:90
int id
Format-specific stream ID.
Definition: avformat.h:888
#define OFFSET(x)
Definition: lavfi.c:487
static const AVClass lavfi_class
Definition: lavfi.c:498
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:268
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4182
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1398
void avfilter_register_all(void)
Initialize the filter system.
Definition: allfilters.c:40
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:143
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:1600
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1868
#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
AVFrame * decoded_frame
Definition: lavfi.c:58
ptrdiff_t size
Definition: opengl_enc.c:101
int nb_sinks
Definition: lavfi.c:59
int * sink_stream_map
Definition: lavfi.c:54
signed 32 bits
Definition: samplefmt.h:62
int nb_side_data
Definition: frame.h:384
AVFrameSideData ** side_data
Definition: frame.h:383
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4081
#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:361
const char * suffix
Definition: checkasm.c:122
int width
width and height of the video frame
Definition: frame.h:236
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
char * dump_graph
Definition: lavfi.c:51
#define AV_BPRINT_SIZE_UNLIMITED
static int create_subcc_streams(AVFormatContext *avctx)
Definition: lavfi.c:99
av_default_item_name
#define AVERROR(e)
Definition: error.h:43
int avfilter_link_get_channels(AVFilterLink *link)
Get the number of channels of a link.
Definition: avfilter.c:178
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:154
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
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:2231
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:57
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3975
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:539
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:128
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: avfilter.c:519
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:120
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1386
audio channel layout utility functions
char filename[1024]
input or output filename
Definition: avformat.h:1406
#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:53
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:514
Stream structure.
Definition: avformat.h:881
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:961
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:248
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:267
A list of zero terminated key/value strings.
Definition: avcodec.h:1488
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:3464
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:254
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:81
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:567
uint8_t * data
Definition: frame.h:145
int * stream_sink_map
Definition: lavfi.c:56
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
AVDictionary * av_frame_get_metadata(const AVFrame *frame)
Describe the class of an AVClass context structure.
Definition: log.h:67
int av_frame_get_channels(const AVFrame *frame)
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: lavfi.c:382
char * graph_filename
Definition: lavfi.c:50
AVMediaType
Definition: avutil.h:193
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:1057
const char * name
Filter name.
Definition: avfilter.h:148
misc parsing utilities
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:262
#define FAIL(ERR)
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:485
enum AVFrameSideDataType type
Definition: frame.h:144
static int flags
Definition: cpu.c:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
#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:4089
AVFilterGraph * graph
Definition: lavfi.c:52
static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame, int sink_idx)
Definition: lavfi.c:358
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:478
signed 16 bits
Definition: samplefmt.h:61
char * graph_str
Definition: lavfi.c:49
char * avfilter_graph_dump(AVFilterGraph *graph, const char *options)
Dump a graph into a human-readable string representation.
Definition: graphdump.c:155
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:491
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
int64_t av_frame_get_pkt_pos(const AVFrame *frame)
void * priv_data
Format private data.
Definition: avformat.h:1358
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:522
int channels
Audio only.
Definition: avcodec.h:4085
An instance of a filter.
Definition: avfilter.h:307
AVPacket subcc_packet
Definition: lavfi.c:60
number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of...
Definition: pixfmt.h:308
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
int height
Definition: frame.h:236
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:662
#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
Definition: avformat.h:1233
#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:63
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:317
int stream_index
Definition: avcodec.h:1602
int * sink_stream_subcc_map
Definition: lavfi.c:57
This structure stores compressed data.
Definition: avcodec.h:1577
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:1092
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:241
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1593
for(j=16;j >0;--j)
#define tb
Definition: regdef.h:68
#define DEC
Definition: lavfi.c:489
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140