FFmpeg
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:1524
#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:2522
This structure describes decoded (raw) audio or video data.
Definition: frame.h:295
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1636
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:566
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:1500
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:4926
const char * desc
Definition: nvenc.c:68
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:4044
#define av_opt_set_int_list(obj, name, val, term, flags)
Set a binary option to an integer list.
Definition: opt.h:709
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:1300
enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
Get the type of an AVFilterPad.
Definition: avfilter.c:1052
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: avcodec.h:3968
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:943
int num
Numerator.
Definition: rational.h:59
int size
Definition: avcodec.h:1481
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:674
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
GLint GLenum type
Definition: opengl_enc.c:104
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:1358
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:4034
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: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:388
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4499
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1426
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:201
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:1480
char * protocol_whitelist
&#39;,&#39; separated list of allowed protocols.
Definition: avformat.h:1918
#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:581
AVFrame * decoded_frame
Definition: lavfi.c:57
ptrdiff_t size
Definition: opengl_enc.c:100
int nb_sinks
Definition: lavfi.c:58
int * sink_stream_map
Definition: lavfi.c:53
signed 32 bits
Definition: samplefmt.h:62
int nb_side_data
Definition: frame.h:507
int av_buffersink_get_h(const AVFilterContext *ctx)
int av_buffersink_get_format(const AVFilterContext *ctx)
AVFrameSideData ** side_data
Definition: frame.h:506
uint64_t channel_layout
Audio only.
Definition: avcodec.h:4070
#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:197
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:259
int width
Definition: frame.h:353
#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
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:1454
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:2487
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:58
enum AVMediaType codec_type
General type of the encoded data.
Definition: avcodec.h:3964
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:568
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:108
#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:493
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:1414
int channels
number of audio channels, only used for audio.
Definition: frame.h:601
audio channel layout utility functions
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:557
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
int n
Definition: avisynth_c.h:760
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:881
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:368
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:1319
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:1506
#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:326
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:599
uint8_t * data
Definition: frame.h:203
int * stream_sink_map
Definition: lavfi.c:55
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:1211
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:275
#define FAIL(ERR)
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:553
enum AVFrameSideDataType type
Definition: frame.h:202
#define flags(name, subs,...)
Definition: cbs_av1.c:561
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:309
#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:4078
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:463
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:1386
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:4074
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:351
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:701
int height
Definition: frame.h:353
#define av_freep(p)
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:654
#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:1028
#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:1482
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later.That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another.Frame references ownership and permissions
int * sink_stream_subcc_map
Definition: lavfi.c:56
This structure stores compressed data.
Definition: avcodec.h:1457
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:1242
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:361
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1473
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