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_array(count + 1, sizeof(*fmts))))
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;
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)
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)
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  if (dump != NULL) {
306  fputs(dump, stderr);
307  fflush(stderr);
308  av_free(dump);
309  } else {
310  FAIL(AVERROR(ENOMEM));
311  }
312  }
313 
314  /* fill each stream with the information in the corresponding sink */
315  for (i = 0; i < lavfi->nb_sinks; i++) {
316  AVFilterContext *sink = lavfi->sinks[lavfi->stream_sink_map[i]];
317  AVRational time_base = av_buffersink_get_time_base(sink);
318  AVStream *st = avctx->streams[i];
320  avpriv_set_pts_info(st, 64, time_base.num, time_base.den);
324  st->codecpar->width = av_buffersink_get_w(sink);
325  st->codecpar->height = av_buffersink_get_h(sink);
326  st ->sample_aspect_ratio =
328  avctx->probesize = FFMAX(avctx->probesize,
331  30);
332  } else if (av_buffersink_get_type(sink) == AVMEDIA_TYPE_AUDIO) {
338  if (st->codecpar->codec_id == AV_CODEC_ID_NONE)
339  av_log(avctx, AV_LOG_ERROR,
340  "Could not find PCM codec for sample format %s.\n",
342  }
343  }
344 
345  if ((ret = create_subcc_streams(avctx)) < 0)
346  goto end;
347 
348  if (!(lavfi->decoded_frame = av_frame_alloc()))
349  FAIL(AVERROR(ENOMEM));
350 
351 end:
352  av_free(pix_fmts);
353  avfilter_inout_free(&input_links);
354  avfilter_inout_free(&output_links);
355  if (ret < 0)
356  lavfi_read_close(avctx);
357  return ret;
358 }
359 
361  int sink_idx)
362 {
363  LavfiContext *lavfi = avctx->priv_data;
364  AVFrameSideData *sd;
365  int stream_idx, ret;
366 
367  if ((stream_idx = lavfi->sink_stream_subcc_map[sink_idx]) < 0)
368  return 0;
370  return 0;
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  AVStream *st;
390 
391  if (lavfi->subcc_packet.size) {
393  return pkt->size;
394  }
395 
396  /* iterate through all the graph sinks. Select the sink with the
397  * minimum PTS */
398  for (i = 0; i < lavfi->nb_sinks; i++) {
400  double d;
401  int ret;
402 
403  if (lavfi->sink_eof[i])
404  continue;
405 
408  if (ret == AVERROR_EOF) {
409  ff_dlog(avctx, "EOF sink_idx:%d\n", i);
410  lavfi->sink_eof[i] = 1;
411  continue;
412  } else if (ret < 0)
413  return ret;
415  ff_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
417 
418  if (d < min_pts) {
419  min_pts = d;
420  min_pts_sink_idx = i;
421  }
422  }
423  if (min_pts == DBL_MAX)
424  return AVERROR_EOF;
425 
426  ff_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
427 
428  av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
429  stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
430  st = avctx->streams[stream_idx];
431 
432  if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO) {
433  size = av_image_get_buffer_size(frame->format, frame->width, frame->height, 1);
434  if ((ret = av_new_packet(pkt, size)) < 0)
435  goto fail;
436 
437  av_image_copy_to_buffer(pkt->data, size, (const uint8_t **)frame->data, frame->linesize,
438  frame->format, frame->width, frame->height, 1);
439  } else if (st->codecpar->codec_type == AVMEDIA_TYPE_AUDIO) {
440  size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
441  frame->channels;
442  if ((ret = av_new_packet(pkt, size)) < 0)
443  goto fail;
444  memcpy(pkt->data, frame->data[0], size);
445  }
446 
447  frame_metadata = frame->metadata;
448  if (frame_metadata) {
449  size_t size;
450  uint8_t *metadata = av_packet_pack_dictionary(frame_metadata, &size);
451 
452  if (!metadata) {
453  ret = AVERROR(ENOMEM);
454  goto fail;
455  }
457  metadata, size)) < 0) {
458  av_freep(&metadata);
459  goto fail;
460  }
461  }
462 
463  if ((ret = create_subcc_packet(avctx, frame, min_pts_sink_idx)) < 0) {
464  goto fail;
465  }
466 
467  pkt->stream_index = stream_idx;
468  pkt->pts = frame->pts;
469  pkt->pos = frame->pkt_pos;
471  return size;
472 fail:
474  return ret;
475 
476 }
477 
478 #define OFFSET(x) offsetof(LavfiContext, x)
479 
480 #define DEC AV_OPT_FLAG_DECODING_PARAM
481 
482 static const AVOption options[] = {
483  { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
484  { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
485  { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
486  { NULL },
487 };
488 
489 static const AVClass lavfi_class = {
490  .class_name = "lavfi indev",
491  .item_name = av_default_item_name,
492  .option = options,
493  .version = LIBAVUTIL_VERSION_INT,
494  .category = AV_CLASS_CATEGORY_DEVICE_INPUT,
495 };
496 
498  .name = "lavfi",
499  .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
500  .priv_data_size = sizeof(LavfiContext),
504  .flags = AVFMT_NOFILE,
505  .priv_class = &lavfi_class,
506 };
AV_CODEC_ID_EIA_608
@ AV_CODEC_ID_EIA_608
Definition: codec_id.h:529
AVMEDIA_TYPE_SUBTITLE
@ AVMEDIA_TYPE_SUBTITLE
Definition: avutil.h:204
AV_BPRINT_SIZE_UNLIMITED
#define AV_BPRINT_SIZE_UNLIMITED
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:119
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
avformat_new_stream
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:4374
LavfiContext::stream_sink_map
int * stream_sink_map
Definition: lavfi.c:55
AVCodecParameters::codec_type
enum AVMediaType codec_type
General type of the encoded data.
Definition: codec_par.h:56
FAIL
#define FAIL(ERR)
LavfiContext::graph_str
char * graph_str
Definition: lavfi.c:48
av_bprint_finalize
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
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:616
sample_fmts
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:953
av_pix_fmt_desc_get
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:2541
AVERROR_EOF
#define AVERROR_EOF
End of file.
Definition: error.h:55
LavfiContext::nb_sinks
int nb_sinks
Definition: lavfi.c:58
AV_FRAME_DATA_A53_CC
@ AV_FRAME_DATA_A53_CC
ATSC A53 Part 4 Closed Captions.
Definition: frame.h:58
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:140
create_subcc_packet
static int create_subcc_packet(AVFormatContext *avctx, AVFrame *frame, int sink_idx)
Definition: lavfi.c:360
AV_TIME_BASE_Q
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avutil.h:260
av_opt_set_int_list
#define av_opt_set_int_list(obj, name, val, term, flags)
Set a binary option to an integer list.
Definition: opt.h:714
AV_CODEC_ID_RAWVIDEO
@ AV_CODEC_ID_RAWVIDEO
Definition: codec_id.h:62
av_frame_free
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:111
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:303
pixdesc.h
AVFormatContext::streams
AVStream ** streams
A list of all streams in the file.
Definition: avformat.h:1174
AVPacket::data
uint8_t * data
Definition: packet.h:365
AVOption
AVOption.
Definition: opt.h:248
LavfiContext::dump_graph
char * dump_graph
Definition: lavfi.c:50
float.h
AVDictionary
Definition: dict.c:30
LavfiContext::graph
AVFilterGraph * graph
Definition: lavfi.c:51
AVFormatContext::probesize
int64_t probesize
Maximum size of the data read from input for determining the input container format.
Definition: avformat.h:1255
AVFilter::name
const char * name
Filter name.
Definition: avfilter.h:149
lavfi_read_packet
static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: lavfi.c:380
av_malloc
#define av_malloc(s)
Definition: tableprint_vlc.h:31
avfilter_graph_free
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
Definition: avfiltergraph.c:120
AV_PIX_FMT_NB
@ AV_PIX_FMT_NB
number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of...
Definition: pixfmt.h:353
AVFormatContext::interrupt_callback
AVIOInterruptCB interrupt_callback
Custom interrupt callbacks for the I/O layer.
Definition: avformat.h:1367
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:139
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
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:1146
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:186
LavfiContext::graph_filename
char * graph_filename
Definition: lavfi.c:49
fail
#define fail()
Definition: checkasm.h:134
avfilter_graph_alloc
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
Definition: avfiltergraph.c:83
AV_PIX_FMT_FLAG_HWACCEL
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:129
read_close
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
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:46
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:98
AV_PKT_DATA_STRINGS_METADATA
@ AV_PKT_DATA_STRINGS_METADATA
A list of zero terminated key/value strings.
Definition: packet.h:172
avfilter_inout_free
void avfilter_inout_free(AVFilterInOut **inout)
Free the supplied list of AVFilterInOut and set *inout to NULL.
Definition: graphparser.c:212
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:181
AVFrameSideData::size
size_t size
Definition: frame.h:212
AVInputFormat
Definition: avformat.h:616
av_cold
#define av_cold
Definition: attributes.h:90
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:89
LavfiContext::sink_stream_map
int * sink_stream_map
Definition: lavfi.c:53
LavfiContext
Definition: lavfi.c:46
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:94
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:1233
AVCodecParameters::sample_aspect_ratio
AVRational sample_aspect_ratio
Video only.
Definition: codec_par.h:136
AVInputFormat::name
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:621
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
lavfi_class
static const AVClass lavfi_class
Definition: lavfi.c:489
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)
pix_fmts
static enum AVPixelFormat pix_fmts[]
Definition: libkvazaar.c:289
options
static const AVOption options[]
Definition: lavfi.c:482
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:49
AVFormatContext
Format I/O context.
Definition: avformat.h:1106
avfilter_get_by_name
const AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: allfilters.c:547
internal.h
AVStream::codecpar
AVCodecParameters * codecpar
Codec parameters associated with this stream.
Definition: avformat.h:979
LIBAVUTIL_VERSION_INT
#define LIBAVUTIL_VERSION_INT
Definition: version.h:85
read_header
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:527
AVClass
Describe the class of an AVClass context structure.
Definition: log.h:67
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:1215
NULL
#define NULL
Definition: coverity.c:32
DEC
#define DEC
Definition: lavfi.c:480
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:1639
av_default_item_name
const char * av_default_item_name(void *ptr)
Return the context name.
Definition: log.c:235
parseutils.h
AV_ROUND_NEAR_INF
@ AV_ROUND_NEAR_INF
Round to nearest and halfway cases away from zero.
Definition: mathematics.h:84
AVFilterGraph
Definition: avfilter.h:798
av_buffersink_get_channel_layout
uint64_t av_buffersink_get_channel_layout(const AVFilterContext *ctx)
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:459
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
av_opt_set_int
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:586
av_bprint_is_complete
static int av_bprint_is_complete(const AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:185
for
for(j=16;j >0;--j)
Definition: h264pred_template.c:469
ff_lavfi_demuxer
const AVInputFormat ff_lavfi_demuxer
Definition: lavfi.c:497
AVFormatContext::nb_streams
unsigned int nb_streams
Number of elements in AVFormatContext.streams.
Definition: avformat.h:1162
ff_dlog
#define ff_dlog(a,...)
Definition: tableprint_vlc.h:29
AVIOContext
Bytestream IO Context.
Definition: avio.h:161
OFFSET
#define OFFSET(x)
Definition: lavfi.c:478
AVMediaType
AVMediaType
Definition: avutil.h:199
AVPacket::size
int size
Definition: packet.h:366
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:117
av_get_padded_bits_per_pixel
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:2506
avfilter_link
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:135
FFMAX
#define FFMAX(a, b)
Definition: common.h:103
avpriv_set_pts_info
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:4799
AVFormatContext::url
char * url
input or output URL.
Definition: avformat.h:1189
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
size
int size
Definition: twinvq_data.h:10344
AVFrameSideData::data
uint8_t * data
Definition: frame.h:211
AVFMT_NOFILE
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:458
LavfiContext::sinks
AVFilterContext ** sinks
Definition: lavfi.c:52
AVStream::sample_aspect_ratio
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:888
avdevice.h
AV_OPT_SEARCH_CHILDREN
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:560
LavfiContext::sink_stream_subcc_map
int * sink_stream_subcc_map
Definition: lavfi.c:56
av_image_get_buffer_size
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:463
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:296
av_buffersink_get_type
enum AVMediaType av_buffersink_get_type(const AVFilterContext *ctx)
buffersink.h
LavfiContext::subcc_packet
AVPacket subcc_packet
Definition: lavfi.c:59
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:1175
create_subcc_streams
static int create_subcc_streams(AVFormatContext *avctx)
Definition: lavfi.c:98
bprint.h
i
int i
Definition: input.c:407
log.h
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:47
AVPacket::pts
int64_t pts
Presentation timestamp in AVStream->time_base units; the time at which the decompressed packet will b...
Definition: packet.h:358
avio_internal.h
av_get_bytes_per_sample
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:106
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:549
internal.h
AV_SAMPLE_FMT_U8
@ AV_SAMPLE_FMT_U8
unsigned 8 bits
Definition: samplefmt.h:60
AVCodecParameters::height
int height
Definition: codec_par.h:127
av_malloc_array
#define av_malloc_array(a, b)
Definition: tableprint_vlc.h:32
AVSampleFormat
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
av_frame_unref
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:436
AV_SAMPLE_FMT_S16
@ AV_SAMPLE_FMT_S16
signed 16 bits
Definition: samplefmt.h:61
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:243
av_buffersink_get_h
int av_buffersink_get_h(const AVFilterContext *ctx)
AVFilter
Filter definition.
Definition: avfilter.h:145
AVStream::id
int id
Format-specific stream ID.
Definition: avformat.h:839
ret
ret
Definition: filter_design.txt:187
read_packet
static int read_packet(void *opaque, uint8_t *buf, int buf_size)
Definition: avio_reading.c:42
AVStream
Stream structure.
Definition: avformat.h:832
LavfiContext::sink_eof
int * sink_eof
Definition: lavfi.c:54
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:72
frame
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
Definition: filter_design.txt:264
avfilter_graph_dump
char * avfilter_graph_dump(AVFilterGraph *graph, const char *options)
Dump a graph into a human-readable string representation.
Definition: graphdump.c:154
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:937
suffix
const char * suffix
Definition: checkasm.c:209
lavfi_read_close
static av_cold int lavfi_read_close(AVFormatContext *avctx)
Definition: lavfi.c:83
channel_layout.h
av_buffersink_get_sample_rate
int av_buffersink_get_sample_rate(const AVFilterContext *ctx)
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:561
AVRational::den
int den
Denominator.
Definition: rational.h:60
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
avfilter.h
av_buffersink_get_channels
int av_buffersink_get_channels(const AVFilterContext *ctx)
create_all_formats
static int * create_all_formats(int n)
Definition: lavfi.c:62
file.h
AVPacket::stream_index
int stream_index
Definition: packet.h:367
AVERROR_FILTER_NOT_FOUND
#define AVERROR_FILTER_NOT_FOUND
Filter not found.
Definition: error.h:58
AVFilterContext
An instance of a filter.
Definition: avfilter.h:333
AVIO_FLAG_READ
#define AVIO_FLAG_READ
read-only
Definition: avio.h:674
av_strdup
char * av_strdup(const char *s)
Duplicate a string.
Definition: mem.c:259
desc
const char * desc
Definition: libsvtav1.c:79
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
mem.h
AVFrameSideData
Structure to hold side data for an AVFrame.
Definition: frame.h:209
AVCodecParameters::format
int format
Definition: codec_par.h:84
AVPixFmtDescriptor
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:70
av_free
#define av_free(p)
Definition: tableprint_vlc.h:34
av_image_copy_to_buffer
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:498
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:108
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:342
av_freep
#define av_freep(p)
Definition: tableprint_vlc.h:35
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:70
AVPacket::pos
int64_t pos
byte position in stream, -1 if unknown
Definition: packet.h:385
AVCodecParameters::channel_layout
uint64_t channel_layout
Audio only.
Definition: codec_par.h:162
d
d
Definition: ffmpeg_filter.c:156
imgutils.h
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
AV_SAMPLE_FMT_DBL
@ AV_SAMPLE_FMT_DBL
double
Definition: samplefmt.h:64
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:62
AVFilterInOut
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:958
AVFormatContext::priv_data
void * priv_data
Format private data.
Definition: avformat.h:1134
AV_SAMPLE_FMT_FLT
@ AV_SAMPLE_FMT_FLT
float
Definition: samplefmt.h:63
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
av_bprint_chars
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
LavfiContext::decoded_frame
AVFrame * decoded_frame
Definition: lavfi.c:57