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"
42 #include "libavformat/internal.h"
43 #include "avdevice.h"
44 
45 typedef struct {
46  AVClass *class; ///< class for private options
47  char *graph_str;
49  char *dump_graph;
53  int *sink_eof;
56  int nb_sinks;
58 } LavfiContext;
59 
61 {
62  LavfiContext *lavfi = avctx->priv_data;
63 
64  av_freep(&lavfi->sink_stream_map);
65  av_freep(&lavfi->sink_eof);
66  av_freep(&lavfi->stream_sink_map);
68  av_freep(&lavfi->sinks);
69  avfilter_graph_free(&lavfi->graph);
70 
71  return 0;
72 }
73 
75 {
76  LavfiContext *lavfi = avctx->priv_data;
77  AVStream *st;
78  int stream_idx, sink_idx;
79  AVRational *time_base;
80 
81  for (stream_idx = 0; stream_idx < lavfi->nb_sinks; stream_idx++) {
82  sink_idx = lavfi->stream_sink_map[stream_idx];
83  if (lavfi->sink_stream_subcc_map[sink_idx]) {
84  lavfi->sink_stream_subcc_map[sink_idx] = avctx->nb_streams;
85  if (!(st = avformat_new_stream(avctx, NULL)))
86  return AVERROR(ENOMEM);
89  time_base = &avctx->streams[stream_idx]->time_base;
90  st->time_base.num = time_base->num;
91  st->time_base.den = time_base->den;
92  } else {
93  lavfi->sink_stream_subcc_map[sink_idx] = -1;
94  }
95  }
96  return 0;
97 }
98 
100 {
101  LavfiContext *lavfi = avctx->priv_data;
102  AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
103  const AVFilter *buffersink, *abuffersink;
104  enum AVMediaType type;
105  int ret = 0, i, n;
106 
107 #define FAIL(ERR) { ret = ERR; goto end; }
108 
109  buffersink = avfilter_get_by_name("buffersink");
110  abuffersink = avfilter_get_by_name("abuffersink");
111 
112  if (lavfi->graph_filename && lavfi->graph_str) {
113  av_log(avctx, AV_LOG_ERROR,
114  "Only one of the graph or graph_file options must be specified\n");
115  FAIL(AVERROR(EINVAL));
116  }
117 
118  if (lavfi->graph_filename) {
119  AVBPrint graph_file_pb;
120  AVIOContext *avio = NULL;
122  if (avctx->protocol_whitelist && (ret = av_dict_set(&options, "protocol_whitelist", avctx->protocol_whitelist, 0)) < 0)
123  goto end;
126  if (ret < 0)
127  goto end;
128  av_bprint_init(&graph_file_pb, 0, AV_BPRINT_SIZE_UNLIMITED);
129  ret = avio_read_to_bprint(avio, &graph_file_pb, INT_MAX);
130  avio_closep(&avio);
131  if (ret) {
132  av_bprint_finalize(&graph_file_pb, NULL);
133  goto end;
134  }
135  if ((ret = av_bprint_finalize(&graph_file_pb, &lavfi->graph_str)))
136  goto end;
137  }
138 
139  if (!lavfi->graph_str)
140  lavfi->graph_str = av_strdup(avctx->url);
141 
142  /* parse the graph, create a stream for each open output */
143  if (!(lavfi->graph = avfilter_graph_alloc()))
144  FAIL(AVERROR(ENOMEM));
145 
146  if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
147  &input_links, &output_links, avctx)) < 0)
148  goto end;
149 
150  if (input_links) {
151  av_log(avctx, AV_LOG_ERROR,
152  "Open inputs in the filtergraph are not acceptable\n");
153  FAIL(AVERROR(EINVAL));
154  }
155 
156  /* count the outputs */
157  for (n = 0, inout = output_links; inout; n++, inout = inout->next);
158  lavfi->nb_sinks = n;
159 
160  if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
161  FAIL(AVERROR(ENOMEM));
162  if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
163  FAIL(AVERROR(ENOMEM));
164  if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
165  FAIL(AVERROR(ENOMEM));
166  if (!(lavfi->sink_stream_subcc_map = av_malloc(sizeof(int) * n)))
167  FAIL(AVERROR(ENOMEM));
168 
169  for (i = 0; i < n; i++)
170  lavfi->stream_sink_map[i] = -1;
171 
172  /* parse the output link names - they need to be of the form out0, out1, ...
173  * create a mapping between them and the streams */
174  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
175  int stream_idx = 0, suffix = 0, use_subcc = 0;
176  if (!inout->name) {
177  av_log(avctx, AV_LOG_ERROR, "Missing %d outpad name\n", i);
178  FAIL(AVERROR(EINVAL));
179  }
180  sscanf(inout->name, "out%n%d%n", &suffix, &stream_idx, &suffix);
181  if (!suffix) {
182  av_log(avctx, AV_LOG_ERROR,
183  "Invalid outpad name '%s'\n", inout->name);
184  FAIL(AVERROR(EINVAL));
185  }
186  if (inout->name[suffix]) {
187  if (!strcmp(inout->name + suffix, "+subcc")) {
188  use_subcc = 1;
189  } else {
190  av_log(avctx, AV_LOG_ERROR,
191  "Invalid outpad suffix '%s'\n", inout->name);
192  FAIL(AVERROR(EINVAL));
193  }
194  }
195 
196  if ((unsigned)stream_idx >= n) {
197  av_log(avctx, AV_LOG_ERROR,
198  "Invalid index was specified in output '%s', "
199  "must be a non-negative value < %d\n",
200  inout->name, n);
201  FAIL(AVERROR(EINVAL));
202  }
203 
204  if (lavfi->stream_sink_map[stream_idx] != -1) {
205  av_log(avctx, AV_LOG_ERROR,
206  "An output with stream index %d was already specified\n",
207  stream_idx);
208  FAIL(AVERROR(EINVAL));
209  }
210  lavfi->sink_stream_map[i] = stream_idx;
211  lavfi->stream_sink_map[stream_idx] = i;
212  lavfi->sink_stream_subcc_map[i] = !!use_subcc;
213  }
214 
215  /* for each open output create a corresponding stream */
216  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
217  AVStream *st;
218  if (!(st = avformat_new_stream(avctx, NULL)))
219  FAIL(AVERROR(ENOMEM));
220  st->id = i;
221  }
222 
223  /* create a sink for each output and connect them to the graph */
224  lavfi->sinks = av_malloc_array(lavfi->nb_sinks, sizeof(AVFilterContext *));
225  if (!lavfi->sinks)
226  FAIL(AVERROR(ENOMEM));
227 
228  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
229  AVFilterContext *sink;
230 
231  type = avfilter_pad_get_type(inout->filter_ctx->output_pads, inout->pad_idx);
232 
233  if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
234  type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
235  av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
237  }
238 
239  if (type == AVMEDIA_TYPE_VIDEO) {
240  ret = avfilter_graph_create_filter(&sink, buffersink,
241  inout->name, NULL,
242  NULL, lavfi->graph);
243  if (ret < 0)
244  goto end;
245  } else if (type == AVMEDIA_TYPE_AUDIO) {
246  static const enum AVSampleFormat sample_fmts[] = {
249  };
250 
251  ret = avfilter_graph_create_filter(&sink, abuffersink,
252  inout->name, NULL,
253  NULL, lavfi->graph);
254  if (ret >= 0)
255  ret = av_opt_set_bin(sink, "sample_fmts", (const uint8_t*)sample_fmts,
257  if (ret < 0)
258  goto end;
259  ret = av_opt_set_int(sink, "all_channel_counts", 1,
261  if (ret < 0)
262  goto end;
263  } else {
264  av_log(avctx, AV_LOG_ERROR,
265  "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
266  FAIL(AVERROR(EINVAL));
267  }
268 
269  lavfi->sinks[i] = sink;
270  if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
271  goto end;
272  }
273 
274  /* configure the graph */
275  if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
276  goto end;
277 
278  if (lavfi->dump_graph) {
279  char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
280  if (dump != NULL) {
281  fputs(dump, stderr);
282  fflush(stderr);
283  av_free(dump);
284  } else {
285  FAIL(AVERROR(ENOMEM));
286  }
287  }
288 
289  /* fill each stream with the information in the corresponding sink */
290  for (i = 0; i < lavfi->nb_sinks; i++) {
291  AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
292  AVRational time_base = av_buffersink_get_time_base(sink);
293  AVRational frame_rate = av_buffersink_get_frame_rate(sink);
294  AVStream *st = avctx->streams[i];
295  AVCodecParameters *const par = st->codecpar;
296  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
297  par->codec_type = av_buffersink_get_type(sink);
298  if (par->codec_type == AVMEDIA_TYPE_VIDEO) {
300  par->format = av_buffersink_get_format(sink);
301  par->width = av_buffersink_get_w(sink);
302  par->height = av_buffersink_get_h(sink);
303  avctx->probesize = FFMAX(avctx->probesize, sizeof(AVFrame) * 30);
304  st ->sample_aspect_ratio =
306  if (frame_rate.num > 0 && frame_rate.den > 0) {
307  st->avg_frame_rate = frame_rate;
308  st->r_frame_rate = frame_rate;
309  }
310  } else if (par->codec_type == AVMEDIA_TYPE_AUDIO) {
313  if (ret < 0)
314  goto end;
315  par->format = av_buffersink_get_format(sink);
316  par->codec_id = av_get_pcm_codec(par->format, -1);
317  if (par->codec_id == AV_CODEC_ID_NONE)
318  av_log(avctx, AV_LOG_ERROR,
319  "Could not find PCM codec for sample format %s.\n",
321  }
322  }
323 
324  if ((ret = create_subcc_streams(avctx)) < 0)
325  goto end;
326 
327 end:
328  avfilter_inout_free(&input_links);
329  avfilter_inout_free(&output_links);
330  return ret;
331 }
332 
334  int sink_idx)
335 {
336  LavfiContext *lavfi = avctx->priv_data;
337  AVFrameSideData *sd;
338  int stream_idx, ret;
339 
340  if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
341  return 0;
343  return 0;
344  if ((ret = av_new_packet(&lavfi->subcc_packet, sd->size)) < 0)
345  return ret;
346  memcpy(lavfi->subcc_packet.data, sd->data, sd->size);
347  lavfi->subcc_packet.stream_index = stream_idx;
348  lavfi->subcc_packet.pts = frame->pts;
349 #if FF_API_FRAME_PKT
351  lavfi->subcc_packet.pos = frame->pkt_pos;
353 #endif
354  return 0;
355 }
356 
357 static void lavfi_free_frame(void *opaque, uint8_t *data)
358 {
359  AVFrame *frame = (AVFrame*)data;
361 }
362 
364 {
365  LavfiContext *lavfi = avctx->priv_data;
366  double min_pts = DBL_MAX;
367  int stream_idx, min_pts_sink_idx = 0;
368  AVFrame *frame, *frame_to_free;
369  AVDictionary *frame_metadata;
370  int ret, i;
371  AVStream *st;
372 
373  if (lavfi->subcc_packet.size) {
375  return pkt->size;
376  }
377 
378  frame = av_frame_alloc();
379  if (!frame)
380  return AVERROR(ENOMEM);
381  frame_to_free = frame;
382 
383  /* iterate through all the graph sinks. Select the sink with the
384  * minimum PTS */
385  for (i = 0; i < lavfi->nb_sinks; i++) {
387  double d;
388 
389  if (lavfi->sink_eof[i])
390  continue;
391 
394  if (ret == AVERROR_EOF) {
395  ff_dlog(avctx, "EOF sink_idx:%d\n", i);
396  lavfi->sink_eof[i] = 1;
397  continue;
398  } else if (ret < 0)
399  goto fail;
401  ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
403 
404  if (d < min_pts) {
405  min_pts = d;
406  min_pts_sink_idx = i;
407  }
408  }
409  if (min_pts == DBL_MAX) {
410  ret = AVERROR_EOF;
411  goto fail;
412  }
413 
414  ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
415 
416  av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
417  stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
418  st = avctx->streams[stream_idx];
419 
420  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
421  pkt->buf = av_buffer_create((uint8_t*)frame, sizeof(*frame),
422  &lavfi_free_frame, NULL, 0);
423  if (!pkt->buf) {
424  ret = AVERROR(ENOMEM);
425  goto fail;
426  }
427  frame_to_free = NULL;
428 
429  pkt->data = pkt->buf->data;
430  pkt->size = pkt->buf->size;
432  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
435  if ((ret = av_new_packet(pkt, size)) < 0)
436  goto fail;
437  memcpy(pkt->data, frame->data[0], size);
438  }
439 
440  frame_metadata = frame->metadata;
441  if (frame_metadata) {
442  size_t size;
443  uint8_t *metadata = av_packet_pack_dictionary(frame_metadata, &size);
444 
445  if (!metadata) {
446  ret = AVERROR(ENOMEM);
447  goto fail;
448  }
450  metadata, size)) < 0) {
451  av_freep(&metadata);
452  goto fail;
453  }
454  }
455 
456  if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
457  goto fail;
458  }
459 
460  pkt->stream_index = stream_idx;
461  pkt->pts = frame->pts;
462 #if FF_API_FRAME_PKT
464  pkt->pos = frame->pkt_pos;
466 #endif
467 
468  av_frame_free(&frame_to_free);
469 
470  return pkt->size;
471 fail:
472  av_frame_free(&frame_to_free);
473  return ret;
474 
475 }
476 
477 #define OFFSET(x) offsetof(LavfiContext, x)
478 
479 #define DEC AV_OPT_FLAG_DECODING_PARAM
480 
481 static const AVOption options[] = {
482  { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
483  { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
484  { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
485  { NULL },
486 };
487 
488 static const AVClass lavfi_class = {
489  .class_name = "lavfi indev",
490  .item_name = av_default_item_name,
491  .option = options,
492  .version = LIBAVUTIL_VERSION_INT,
493  .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
494 };
495 
497  .name = "lavfi",
498  .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
499  .priv_data_size = sizeof(LavfiContext),
503  .flags = AVFMT_NOFILE,
504  .priv_class = &lavfi_class,
505  .flags_internal = FF_FMT_INIT_CLEANUP,
506 };
AV_CODEC_ID_EIA_608
@ AV_CODEC_ID_EIA_608
Definition: codec_id.h:562
FF_ENABLE_DEPRECATION_WARNINGS
#define FF_ENABLE_DEPRECATION_WARNINGS
Definition: internal.h:73
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
av_buffersink_get_ch_layout
int av_buffersink_get_ch_layout(const AVFilterContext *ctx, AVChannelLayout *out)
Definition: buffersink.c:234
av_buffersink_get_sample_aspect_ratio
AVRational av_buffersink_get_sample_aspect_ratio(const AVFilterContext *ctx)
lavfi_read_header
static av_cold int lavfi_read_header(AVFormatContext *avctx)
Definition: lavfi.c:99
FF_FMT_INIT_CLEANUP
#define FF_FMT_INIT_CLEANUP
For an AVInputFormat with this flag set read_close() needs to be called by the caller upon read_heade...
Definition: internal.h:46
AVERROR
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
opt.h
LavfiContext::stream_sink_map
int * stream_sink_map
Definition: lavfi.c:54
lavfi_free_frame
static void lavfi_free_frame(void *opaque, uint8_t *data)
Definition: lavfi.c:357
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:51
FAIL
#define FAIL(ERR)
LavfiContext::graph_str
char * graph_str
Definition: lavfi.c:47
av_bprint_init
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Definition: bprint.c:69
av_frame_get_side_data
AVFrameSideData * av_frame_get_side_data(const AVFrame *frame, enum AVFrameSideDataType type)
Definition: frame.c:824
AVCodecParameters
This struct describes the properties of an encoded stream.
Definition: codec_par.h:47
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const struct AVCodec *c)
Add a new stream to a media file.
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:947
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:57
AVBufferRef::data
uint8_t * data
The data buffer.
Definition: buffer.h:90
LavfiContext::nb_sinks
int nb_sinks
Definition: lavfi.c:56
AV_FRAME_DATA_A53_CC
@ AV_FRAME_DATA_A53_CC
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:59
av_buffersink_get_frame_flags
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:151
create_subcc_packet
static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame, int sink_idx)
Definition: lavfi.c:333
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:264
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:100
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:340
pixdesc.h
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1431
AVFrame::pts
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:452
AVPacket::data
uint8_t * data
Definition: packet.h:522
AVOption
AVOption.
Definition: opt.h:251
AVStream::avg_frame_rate
AVRational avg_frame_rate
Average framerate.
Definition: avformat.h:930
data
const char data[16]
Definition: mxf.c:148
LavfiContext::dump_graph
char * dump_graph
Definition: lavfi.c:49
float.h
AVDictionary
Definition: dict.c:34
LavfiContext::graph
AVFilterGraph * graph
Definition: lavfi.c:50
FFMAX
#define FFMAX(a, b)
Definition: macros.h:47
AVFormatContext::probesize
int64_t probesize
Maximum number of bytes read from input in order to determine stream properties.
Definition: avformat.h:1517
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:170
lavfi_read_packet
static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: lavfi.c:363
AVChannelLayout::nb_channels
int nb_channels
Number of channels in this layout.
Definition: channel_layout.h:323
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:361
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:30
avfilter_graph_free
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
Definition: avfiltergraph.c:116
AVFormatContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1629
avfilter_graph_create_filter
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.
Definition: avfiltergraph.c:137
avpriv_set_pts_info
void avpriv_set_pts_info(AVStream *st, int pts_wrap_bits, unsigned int pts_num, unsigned int pts_den)
Set the time base and wrapping info for a given stream.
Definition: avformat.c:843
avio_open2
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:1329
av_packet_add_side_data
int av_packet_add_side_data(AVPacket *pkt, enum AVPacketSideDataType type, uint8_t *data, size_t size)
Wrap an existing array as a packet side data.
Definition: avpacket.c:197
LavfiContext::graph_filename
char * graph_filename
Definition: lavfi.c:48
fail
#define fail()
Definition: checkasm.h:179
avfilter_graph_alloc
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
Definition: avfiltergraph.c:82
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:143
AVFrame::ch_layout
AVChannelLayout ch_layout
Channel layout of the audio data.
Definition: frame.h:802
type
it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf type
Definition: writing_filters.txt:86
AV_CLASS_CATEGORY_DEVICE_INPUT
@ AV_CLASS_CATEGORY_DEVICE_INPUT
Definition: log.h:45
AVRational::num
int num
Numerator.
Definition: rational.h:59
av_frame_alloc
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:88
avfilter_inout_free
void avfilter_inout_free(AVFilterInOut **inout)
Free the supplied list of AVFilterInOut and set *inout to NULL.
Definition: graphparser.c:76
pkt
AVPacket * pkt
Definition: movenc.c:59
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:180
AVFrameSideData::size
size_t size
Definition: frame.h:249
AVInputFormat
Definition: avformat.h:549
av_cold
#define av_cold
Definition: attributes.h:90
av_buffersink_get_frame_rate
AVRational av_buffersink_get_frame_rate(const AVFilterContext *ctx)
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_read_callback.c:41
AV_BUFFERSINK_FLAG_PEEK
#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:90
LavfiContext::sink_stream_map
int * sink_stream_map
Definition: lavfi.c:52
LavfiContext
Definition: lavfi.c:45
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:98
avio_read_to_bprint
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:1435
AVCodecParameters::sample_aspect_ratio
AVRational sample_aspect_ratio
Video only.
Definition: codec_par.h:131
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:554
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:121
lavfi_class
static const AVClass lavfi_class
Definition: lavfi.c:488
av_buffersink_get_format
int av_buffersink_get_format(const AVFilterContext *ctx)
av_buffersink_get_time_base
AVRational av_buffersink_get_time_base(const AVFilterContext *ctx)
options
static const AVOption options[]
Definition: lavfi.c:481
av_get_sample_fmt_name
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:51
AV_CODEC_ID_WRAPPED_AVFRAME
@ AV_CODEC_ID_WRAPPED_AVFRAME
Passthrough codec, AVFrames wrapped in AVPacket.
Definition: codec_id.h:603
frame
static AVFrame * frame
Definition: demux_decode.c:54
AVFormatContext
Format I/O context.
Definition: avformat.h:1363
avfilter_get_by_name
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: allfilters.c:629
internal.h
AVPacket::buf
AVBufferRef * buf
A reference to the reference-counted buffer where the packet data is stored.
Definition: packet.h:505
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:864
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:550
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:66
avfilter_graph_config
int avfilter_graph_config(AVFilterGraph *graphctx, void *log_ctx)
Check validity and configure all the links and formats in the graph.
Definition: avfiltergraph.c:1325
AVStream::time_base
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented.
Definition: avformat.h:880
NULL
#define NULL
Definition: coverity.c:32
av_opt_set_bin
int av_opt_set_bin(void *obj, const char *name, const uint8_t *val, int len, int search_flags)
Definition: opt.c:649
DEC
#define DEC
Definition: lavfi.c:479
AVRational
Rational number (pair of numerator and denominator).
Definition: rational.h:58
AVFormatContext::protocol_whitelist
char * protocol_whitelist
',' separated list of allowed protocols.
Definition: avformat.h:1900
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:237
parseutils.h
AV_ROUND_NEAR_INF
@ AV_ROUND_NEAR_INF
Round to nearest and halfway cases away from zero.
Definition: mathematics.h:135
AVFilterGraph
Definition: avfilter.h:830
AVCodecParameters::ch_layout
AVChannelLayout ch_layout
Audio only.
Definition: codec_par.h:206
av_packet_move_ref
void av_packet_move_ref(AVPacket *dst, AVPacket *src)
Move every field in src to dst and reset src.
Definition: avpacket.c:484
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:171
av_opt_set_int
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:634
av_buffer_create
AVBufferRef * av_buffer_create(uint8_t *data, size_t size, void(*free)(void *opaque, uint8_t *data), void *opaque, int flags)
Create an AVBuffer from an existing array.
Definition: buffer.c:55
ff_lavfi_demuxer
const AVInputFormat ff_lavfi_demuxer
Definition: lavfi.c:496
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1419
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:28
AVIOContext
Bytestream IO Context.
Definition: avio.h:166
OFFSET
#define OFFSET(x)
Definition: lavfi.c:477
AVMediaType
AVMediaType
Definition: avutil.h:199
AVPacket::size
int size
Definition: packet.h:523
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:106
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:240
for
for(k=2;k<=8;++k)
Definition: h264pred_template.c:425
avfilter_link
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:148
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1446
size
int size
Definition: twinvq_data.h:10344
AVFrameSideData::data
uint8_t * data
Definition: frame.h:248
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:469
AVFrame::pkt_pos
attribute_deprecated int64_t pkt_pos
reordered pos from the last AVPacket that has been input into the decoder
Definition: frame.h:687
LavfiContext::sinks
AVFilterContext ** sinks
Definition: lavfi.c:51
AVFrame::format
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames,...
Definition: frame.h:427
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:919
avdevice.h
AV_OPT_SEARCH_CHILDREN
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:563
LavfiContext::sink_stream_subcc_map
int * sink_stream_subcc_map
Definition: lavfi.c:55
av_packet_pack_dictionary
uint8_t * av_packet_pack_dictionary(AVDictionary *dict, size_t *size)
Pack a dictionary for use in side_data.
Definition: avpacket.c:312
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:528
av_dict_free
void av_dict_free(AVDictionary **pm)
Free all the memory allocated for an AVDictionary struct and all keys and values.
Definition: dict.c:225
av_buffersink_get_type
enum AVMediaType av_buffersink_get_type(const AVFilterContext *ctx)
AVBufferRef::size
size_t size
Size of data in bytes.
Definition: buffer.h:94
buffersink.h
AV_PKT_DATA_STRINGS_METADATA
@ AV_PKT_DATA_STRINGS_METADATA
A list of zero terminated key/value strings.
Definition: packet.h:173
LavfiContext::subcc_packet
AVPacket subcc_packet
Definition: lavfi.c:57
av_buffersink_get_w
int av_buffersink_get_w(const AVFilterContext *ctx)
avio_closep
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:1368
create_subcc_streams
static int create_subcc_streams(AVFormatContext *avctx)
Definition: lavfi.c:74
AVFrame::nb_samples
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:420
bprint.h
log.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:50
i
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:255
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:515
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:108
avfilter_graph_parse_ptr
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:919
internal.h
AV_SAMPLE_FMT_U8
@ AV_SAMPLE_FMT_U8
unsigned 8 bits
Definition: samplefmt.h:57
AVCodecParameters::height
int height
Definition: codec_par.h:122
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:31
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:55
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:622
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:58
tb
#define tb
Definition: regdef.h:68
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:254
av_buffersink_get_h
int av_buffersink_get_h(const AVFilterContext *ctx)
AVFilter
Filter definition.
Definition: avfilter.h:166
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:853
ret
ret
Definition: filter_design.txt:187
AVStream
Stream structure.
Definition: avformat.h:841
LavfiContext::sink_eof
int * sink_eof
Definition: lavfi.c:53
AVClass::class_name
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:71
avfilter_graph_dump
char * avfilter_graph_dump(AVFilterGraph *graph, const char *options)
Dump a graph into a human-readable string representation.
Definition: graphdump.c:155
avfilter_pad_get_type
enum AVMediaType avfilter_pad_get_type(const AVFilterPad *pads, int pad_idx)
Get the type of an AVFilterPad.
Definition: avfilter.c:966
suffix
const char * suffix
Definition: checkasm.c:252
lavfi_read_close
static av_cold int lavfi_read_close(AVFormatContext *avctx)
Definition: lavfi.c:60
channel_layout.h
av_buffersink_get_sample_rate
int av_buffersink_get_sample_rate(const AVFilterContext *ctx)
AVRational::den
int den
Denominator.
Definition: rational.h:60
avfilter.h
AVFrame::metadata
AVDictionary * metadata
metadata.
Definition: frame.h:708
AVStream::r_frame_rate
AVRational r_frame_rate
Real base framerate of the stream.
Definition: avformat.h:1007
file.h
AVPacket::stream_index
int stream_index
Definition: packet.h:524
AVERROR_FILTER_NOT_FOUND
#define AVERROR_FILTER_NOT_FOUND
Filter not found.
Definition: error.h:60
AVFilterContext
An instance of a filter.
Definition: avfilter.h:409
FF_DISABLE_DEPRECATION_WARNINGS
#define FF_DISABLE_DEPRECATION_WARNINGS
Definition: internal.h:72
av_get_pcm_codec
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:536
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:636
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:270
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:246
AVCodecParameters::format
int format
Definition: codec_par.h:79
av_free
#define av_free(p)
Definition: tableprint_vlc.h:33
AV_ROUND_PASS_MINMAX
@ AV_ROUND_PASS_MINMAX
Flag telling rescaling functions to pass INT64_MIN/MAX through unchanged, avoiding special cases for ...
Definition: mathematics.h:159
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:55
AVPacket
This structure stores compressed data.
Definition: packet.h:499
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:34
av_dict_set
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:88
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:542
d
d
Definition: ffmpeg_filter.c:424
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:474
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:27
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:61
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
AV_SAMPLE_FMT_S32
@ AV_SAMPLE_FMT_S32
signed 32 bits
Definition: samplefmt.h:59
AVFilterInOut
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:978
AV_PKT_FLAG_TRUSTED
#define AV_PKT_FLAG_TRUSTED
The packet comes from a trusted source.
Definition: packet.h:591
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1391
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:60
av_rescale_q_rnd
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