FFmpeg  2.1.1
lavfi.c
Go to the documentation of this file.
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"
31 #include "libavutil/channel_layout.h"
32 #include "libavutil/file.h"
33 #include "libavutil/log.h"
34 #include "libavutil/mem.h"
35 #include "libavutil/opt.h"
36 #include "libavutil/parseutils.h"
37 #include "libavutil/pixdesc.h"
38 #include "libavfilter/avfilter.h"
39 #include "libavfilter/avfiltergraph.h"
40 #include "libavfilter/buffersink.h"
41 #include "libavformat/internal.h"
42 #include "avdevice.h"
43 
44 typedef struct {
45  AVClass *class; ///< class for private options
46  char *graph_str;
48  char *dump_graph;
52  int *sink_eof;
55 } LavfiContext;
56 
57 static int *create_all_formats(int n)
58 {
59  int i, j, *fmts, count = 0;
60 
61  for (i = 0; i < n; i++) {
62  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
63  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
64  count++;
65  }
66 
67  if (!(fmts = av_malloc((count+1) * sizeof(int))))
68  return NULL;
69  for (j = 0, i = 0; i < n; i++) {
70  const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(i);
71  if (!(desc->flags & AV_PIX_FMT_FLAG_HWACCEL))
72  fmts[j++] = i;
73  }
74  fmts[j] = -1;
75  return fmts;
76 }
77 
79 {
80  LavfiContext *lavfi = avctx->priv_data;
81 
82  av_freep(&lavfi->sink_stream_map);
83  av_freep(&lavfi->sink_eof);
84  av_freep(&lavfi->stream_sink_map);
85  av_freep(&lavfi->sinks);
86  avfilter_graph_free(&lavfi->graph);
88 
89  return 0;
90 }
91 
93 {
94  LavfiContext *lavfi = avctx->priv_data;
95  AVFilterInOut *input_links = NULL, *output_links = NULL, *inout;
96  AVFilter *buffersink, *abuffersink;
97  int *pix_fmts = create_all_formats(AV_PIX_FMT_NB);
98  enum AVMediaType type;
99  int ret = 0, i, n;
100 
101 #define FAIL(ERR) { ret = ERR; goto end; }
102 
103  if (!pix_fmts)
104  FAIL(AVERROR(ENOMEM));
105 
107 
108  buffersink = avfilter_get_by_name("buffersink");
109  abuffersink = avfilter_get_by_name("abuffersink");
110 
111  if (lavfi->graph_filename && lavfi->graph_str) {
112  av_log(avctx, AV_LOG_ERROR,
113  "Only one of the graph or graph_file options must be specified\n");
114  FAIL(AVERROR(EINVAL));
115  }
116 
117  if (lavfi->graph_filename) {
118  uint8_t *file_buf, *graph_buf;
119  size_t file_bufsize;
120  ret = av_file_map(lavfi->graph_filename,
121  &file_buf, &file_bufsize, 0, avctx);
122  if (ret < 0)
123  goto end;
124 
125  /* create a 0-terminated string based on the read file */
126  graph_buf = av_malloc(file_bufsize + 1);
127  if (!graph_buf) {
128  av_file_unmap(file_buf, file_bufsize);
129  FAIL(AVERROR(ENOMEM));
130  }
131  memcpy(graph_buf, file_buf, file_bufsize);
132  graph_buf[file_bufsize] = 0;
133  av_file_unmap(file_buf, file_bufsize);
134  lavfi->graph_str = graph_buf;
135  }
136 
137  if (!lavfi->graph_str)
138  lavfi->graph_str = av_strdup(avctx->filename);
139 
140  /* parse the graph, create a stream for each open output */
141  if (!(lavfi->graph = avfilter_graph_alloc()))
142  FAIL(AVERROR(ENOMEM));
143 
144  if ((ret = avfilter_graph_parse_ptr(lavfi->graph, lavfi->graph_str,
145  &input_links, &output_links, avctx)) < 0)
146  FAIL(ret);
147 
148  if (input_links) {
149  av_log(avctx, AV_LOG_ERROR,
150  "Open inputs in the filtergraph are not acceptable\n");
151  FAIL(AVERROR(EINVAL));
152  }
153 
154  /* count the outputs */
155  for (n = 0, inout = output_links; inout; n++, inout = inout->next);
156 
157  if (!(lavfi->sink_stream_map = av_malloc(sizeof(int) * n)))
158  FAIL(AVERROR(ENOMEM));
159  if (!(lavfi->sink_eof = av_mallocz(sizeof(int) * n)))
160  FAIL(AVERROR(ENOMEM));
161  if (!(lavfi->stream_sink_map = av_malloc(sizeof(int) * n)))
162  FAIL(AVERROR(ENOMEM));
163 
164  for (i = 0; i < n; i++)
165  lavfi->stream_sink_map[i] = -1;
166 
167  /* parse the output link names - they need to be of the form out0, out1, ...
168  * create a mapping between them and the streams */
169  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
170  int stream_idx;
171  if (!strcmp(inout->name, "out"))
172  stream_idx = 0;
173  else if (sscanf(inout->name, "out%d\n", &stream_idx) != 1) {
174  av_log(avctx, AV_LOG_ERROR,
175  "Invalid outpad name '%s'\n", inout->name);
176  FAIL(AVERROR(EINVAL));
177  }
178 
179  if ((unsigned)stream_idx >= n) {
180  av_log(avctx, AV_LOG_ERROR,
181  "Invalid index was specified in output '%s', "
182  "must be a non-negative value < %d\n",
183  inout->name, n);
184  FAIL(AVERROR(EINVAL));
185  }
186 
187  /* is an audio or video output? */
188  type = inout->filter_ctx->output_pads[inout->pad_idx].type;
189  if (type != AVMEDIA_TYPE_VIDEO && type != AVMEDIA_TYPE_AUDIO) {
190  av_log(avctx, AV_LOG_ERROR,
191  "Output '%s' is not a video or audio output, not yet supported\n", inout->name);
192  FAIL(AVERROR(EINVAL));
193  }
194 
195  if (lavfi->stream_sink_map[stream_idx] != -1) {
196  av_log(avctx, AV_LOG_ERROR,
197  "An output with stream index %d was already specified\n",
198  stream_idx);
199  FAIL(AVERROR(EINVAL));
200  }
201  lavfi->sink_stream_map[i] = stream_idx;
202  lavfi->stream_sink_map[stream_idx] = i;
203  }
204 
205  /* for each open output create a corresponding stream */
206  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
207  AVStream *st;
208  if (!(st = avformat_new_stream(avctx, NULL)))
209  FAIL(AVERROR(ENOMEM));
210  st->id = i;
211  }
212 
213  /* create a sink for each output and connect them to the graph */
214  lavfi->sinks = av_malloc(sizeof(AVFilterContext *) * avctx->nb_streams);
215  if (!lavfi->sinks)
216  FAIL(AVERROR(ENOMEM));
217 
218  for (i = 0, inout = output_links; inout; i++, inout = inout->next) {
219  AVFilterContext *sink;
220 
221  type = inout->filter_ctx->output_pads[inout->pad_idx].type;
222 
223  if (type == AVMEDIA_TYPE_VIDEO && ! buffersink ||
224  type == AVMEDIA_TYPE_AUDIO && ! abuffersink) {
225  av_log(avctx, AV_LOG_ERROR, "Missing required buffersink filter, aborting.\n");
227  }
228 
229  if (type == AVMEDIA_TYPE_VIDEO) {
230  ret = avfilter_graph_create_filter(&sink, buffersink,
231  inout->name, NULL,
232  NULL, lavfi->graph);
233  if (ret >= 0)
234  ret = av_opt_set_int_list(sink, "pix_fmts", pix_fmts, AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
235  if (ret < 0)
236  goto end;
237  } else if (type == AVMEDIA_TYPE_AUDIO) {
242  AV_SAMPLE_FMT_DBL, -1 };
243 
244  ret = avfilter_graph_create_filter(&sink, abuffersink,
245  inout->name, NULL,
246  NULL, lavfi->graph);
247  if (ret >= 0)
248  ret = av_opt_set_int_list(sink, "sample_fmts", sample_fmts, AV_SAMPLE_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
249  if (ret < 0)
250  goto end;
251  }
252 
253  lavfi->sinks[i] = sink;
254  if ((ret = avfilter_link(inout->filter_ctx, inout->pad_idx, sink, 0)) < 0)
255  FAIL(ret);
256  }
257 
258  /* configure the graph */
259  if ((ret = avfilter_graph_config(lavfi->graph, avctx)) < 0)
260  FAIL(ret);
261 
262  if (lavfi->dump_graph) {
263  char *dump = avfilter_graph_dump(lavfi->graph, lavfi->dump_graph);
264  fputs(dump, stderr);
265  fflush(stderr);
266  av_free(dump);
267  }
268 
269  /* fill each stream with the information in the corresponding sink */
270  for (i = 0; i < avctx->nb_streams; i++) {
271  AVFilterLink *link = lavfi->sinks[lavfi->stream_sink_map[i]]->inputs[0];
272  AVStream *st = avctx->streams[i];
273  st->codec->codec_type = link->type;
274  avpriv_set_pts_info(st, 64, link->time_base.num, link->time_base.den);
275  if (link->type == AVMEDIA_TYPE_VIDEO) {
277  st->codec->pix_fmt = link->format;
278  st->codec->time_base = link->time_base;
279  st->codec->width = link->w;
280  st->codec->height = link->h;
281  st ->sample_aspect_ratio =
283  avctx->probesize = FFMAX(avctx->probesize,
284  link->w * link->h *
286  30);
287  } else if (link->type == AVMEDIA_TYPE_AUDIO) {
288  st->codec->codec_id = av_get_pcm_codec(link->format, -1);
290  st->codec->sample_fmt = link->format;
291  st->codec->sample_rate = link->sample_rate;
292  st->codec->time_base = link->time_base;
293  st->codec->channel_layout = link->channel_layout;
294  if (st->codec->codec_id == AV_CODEC_ID_NONE)
295  av_log(avctx, AV_LOG_ERROR,
296  "Could not find PCM codec for sample format %s.\n",
298  }
299  }
300 
301  if (!(lavfi->decoded_frame = av_frame_alloc()))
302  FAIL(AVERROR(ENOMEM));
303 
304 end:
305  av_free(pix_fmts);
306  avfilter_inout_free(&input_links);
307  avfilter_inout_free(&output_links);
308  if (ret < 0)
309  lavfi_read_close(avctx);
310  return ret;
311 }
312 
314 {
315  LavfiContext *lavfi = avctx->priv_data;
316  double min_pts = DBL_MAX;
317  int stream_idx, min_pts_sink_idx = 0;
318  AVFrame *frame = lavfi->decoded_frame;
319  AVPicture pict;
320  AVDictionary *frame_metadata;
321  int ret, i;
322  int size = 0;
323 
324  /* iterate through all the graph sinks. Select the sink with the
325  * minimum PTS */
326  for (i = 0; i < avctx->nb_streams; i++) {
327  AVRational tb = lavfi->sinks[i]->inputs[0]->time_base;
328  double d;
329  int ret;
330 
331  if (lavfi->sink_eof[i])
332  continue;
333 
334  ret = av_buffersink_get_frame_flags(lavfi->sinks[i], frame,
336  if (ret == AVERROR_EOF) {
337  av_dlog(avctx, "EOF sink_idx:%d\n", i);
338  lavfi->sink_eof[i] = 1;
339  continue;
340  } else if (ret < 0)
341  return ret;
342  d = av_rescale_q(frame->pts, tb, AV_TIME_BASE_Q);
343  av_dlog(avctx, "sink_idx:%d time:%f\n", i, d);
344  av_frame_unref(frame);
345 
346  if (d < min_pts) {
347  min_pts = d;
348  min_pts_sink_idx = i;
349  }
350  }
351  if (min_pts == DBL_MAX)
352  return AVERROR_EOF;
353 
354  av_dlog(avctx, "min_pts_sink_idx:%i\n", min_pts_sink_idx);
355 
356  av_buffersink_get_frame_flags(lavfi->sinks[min_pts_sink_idx], frame, 0);
357  stream_idx = lavfi->sink_stream_map[min_pts_sink_idx];
358 
359  if (frame->width /* FIXME best way of testing a video */) {
360  size = avpicture_get_size(frame->format, frame->width, frame->height);
361  if ((ret = av_new_packet(pkt, size)) < 0)
362  return ret;
363 
364  memcpy(pict.data, frame->data, 4*sizeof(frame->data[0]));
365  memcpy(pict.linesize, frame->linesize, 4*sizeof(frame->linesize[0]));
366 
367  avpicture_layout(&pict, frame->format, frame->width, frame->height,
368  pkt->data, size);
369  } else if (av_frame_get_channels(frame) /* FIXME test audio */) {
370  size = frame->nb_samples * av_get_bytes_per_sample(frame->format) *
371  av_frame_get_channels(frame);
372  if ((ret = av_new_packet(pkt, size)) < 0)
373  return ret;
374  memcpy(pkt->data, frame->data[0], size);
375  }
376 
377  frame_metadata = av_frame_get_metadata(frame);
378  if (frame_metadata) {
379  uint8_t *metadata;
380  AVDictionaryEntry *e = NULL;
381  AVBPrint meta_buf;
382 
384  while ((e = av_dict_get(frame_metadata, "", e, AV_DICT_IGNORE_SUFFIX))) {
385  av_bprintf(&meta_buf, "%s", e->key);
386  av_bprint_chars(&meta_buf, '\0', 1);
387  av_bprintf(&meta_buf, "%s", e->value);
388  av_bprint_chars(&meta_buf, '\0', 1);
389  }
390  if (!av_bprint_is_complete(&meta_buf) ||
392  meta_buf.len))) {
393  av_bprint_finalize(&meta_buf, NULL);
394  return AVERROR(ENOMEM);
395  }
396  memcpy(metadata, meta_buf.str, meta_buf.len);
397  av_bprint_finalize(&meta_buf, NULL);
398  }
399 
400  pkt->stream_index = stream_idx;
401  pkt->pts = frame->pts;
402  pkt->pos = av_frame_get_pkt_pos(frame);
403  pkt->size = size;
404  av_frame_unref(frame);
405  return size;
406 }
407 
408 #define OFFSET(x) offsetof(LavfiContext, x)
409 
410 #define DEC AV_OPT_FLAG_DECODING_PARAM
411 
412 static const AVOption options[] = {
413  { "graph", "set libavfilter graph", OFFSET(graph_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
414  { "graph_file","set libavfilter graph filename", OFFSET(graph_filename), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC},
415  { "dumpgraph", "dump graph to stderr", OFFSET(dump_graph), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, DEC },
416  { NULL },
417 };
418 
419 static const AVClass lavfi_class = {
420  .class_name = "lavfi indev",
421  .item_name = av_default_item_name,
422  .option = options,
423  .version = LIBAVUTIL_VERSION_INT,
424 };
425 
427  .name = "lavfi",
428  .long_name = NULL_IF_CONFIG_SMALL("Libavfilter virtual input device"),
429  .priv_data_size = sizeof(LavfiContext),
433  .flags = AVFMT_NOFILE,
434  .priv_class = &lavfi_class,
435 };
void av_bprint_chars(AVBPrint *buf, char c, unsigned n)
Append char c n times to a print buffer.
Definition: bprint.c:140
char * key
Definition: dict.h:81
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:96
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:47
AVOption.
Definition: opt.h:253
const char * name
Filter name.
Definition: avfilter.h:468
const char * name
A comma separated list of short names for the format.
Definition: avformat.h:478
int linesize[AV_NUM_DATA_POINTERS]
number of bytes per line
Definition: avcodec.h:3123
#define AVERROR_FILTER_NOT_FOUND
#define LIBAVUTIL_VERSION_INT
Definition: avcodec.h:820
int64_t pos
byte position in stream, -1 if unknown
Definition: avcodec.h:1092
static av_cold int lavfi_read_close(AVFormatContext *avctx)
Definition: lavfi.c:78
char * av_strdup(const char *s) av_malloc_attrib
Duplicate the string s.
Definition: mem.c:256
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:3922
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:180
#define av_opt_set_int_list(obj, name, val, term, flags)
Set a binary option to an integer list.
Definition: opt.h:674
AVDictionaryEntry * av_dict_get(AVDictionary *m, const char *key, const AVDictionaryEntry *prev, int flags)
Get a dictionary entry with matching key.
Definition: dict.c:39
AVCodecContext * codec
Codec context associated with this stream.
Definition: avformat.h:686
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown)
Definition: avformat.h:733
int num
numerator
Definition: rational.h:44
int size
Definition: avcodec.h:1064
AVRational sample_aspect_ratio
sample aspect ratio (0 if unknown) That is the width of a pixel divided by the height of the pixel...
Definition: avcodec.h:1517
void avfilter_graph_free(AVFilterGraph **graph)
Free a graph, destroy its links, and set *graph to NULL.
void av_log(void *avcl, int level, const char *fmt,...) av_printf_format(3
Send the specified message to the log if the level is less than or equal to the current av_log_level...
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1342
int avpicture_layout(const AVPicture *src, enum AVPixelFormat pix_fmt, int width, int height, unsigned char *dest, int dest_size)
Copy pixel data from an AVPicture into a buffer.
Definition: avpicture.c:41
enum AVMediaType type
AVFilterPad type.
Definition: internal.h:71
av_dlog(ac->avr,"%d samples - audio_convert: %s to %s (%s)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt), use_generic?ac->func_descr_generic:ac->func_descr)
Pixel format.
Definition: avcodec.h:4533
Picture data structure.
Definition: avcodec.h:3121
#define av_cold
Definition: avcodec.h:653
int * sink_eof
Definition: lavfi.c:52
unsigned 8 bits
Definition: samplefmt.h:51
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1265
void av_freep(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc() and set the pointer ...
Definition: mem.c:234
Format I/O context.
Definition: avformat.h:968
AVInputFormat ff_lavfi_demuxer
Definition: lavfi.c:426
#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:103
int avfilter_link(AVFilterContext *src, unsigned srcpad, AVFilterContext *dst, unsigned dstpad)
Link two filters together.
Definition: avfilter.c:128
const char * av_default_item_name(void *ctx)
Return the context name.
Definition: log.c:145
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1881
uint8_t
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:55
static av_cold int end(AVCodecContext *avctx)
Definition: avrndec.c:67
int id
Format-specific stream ID.
Definition: avformat.h:674
#define OFFSET(x)
Definition: lavfi.c:408
static const AVClass lavfi_class
Definition: lavfi.c:419
int64_t pts
Presentation timestamp in time_base units (time when frame should be shown to user).
Definition: frame.h:182
void avfilter_register_all(void)
Initialize the filter system.
Definition: allfilters.c:40
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.
signed 32 bits
Definition: samplefmt.h:53
static av_cold int read_close(AVFormatContext *ctx)
Definition: libcdio.c:145
#define AVFMT_NOFILE
Demuxer will use avio_open, no opened file should be provided by the caller.
Definition: avformat.h:347
AVFrame * decoded_frame
Definition: lavfi.c:54
int * sink_stream_map
Definition: lavfi.c:51
AVStream * avformat_new_stream(AVFormatContext *s, const AVCodec *c)
Add a new stream to a media file.
Definition: utils.c:3348
uint8_t * data[AV_NUM_DATA_POINTERS]
pointers to the image data planes
Definition: avcodec.h:3122
const OptionDef options[]
Definition: ffserver.c:4682
signed 16 bits
Definition: samplefmt.h:52
static AVFrame * frame
Definition: demuxing.c:51
int64_t av_rescale_q(int64_t a, AVRational bq, AVRational cq) av_const
Rescale a 64-bit integer by 2 rational numbers.
Definition: mathematics.c:130
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:83
int width
width and height of the video frame
Definition: frame.h:145
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: avcodec.h:4147
void av_free(void *ptr)
Free a memory block which has been allocated with av_malloc(z)() or av_realloc(). ...
Definition: mem.c:219
char * dump_graph
Definition: lavfi.c:48
void * priv_data
Format private data.
Definition: avformat.h:988
char filename[1024]
input or output filename
Definition: avformat.h:1018
#define AV_BPRINT_SIZE_UNLIMITED
Convenience macros for special values for av_bprint_init() size_max parameter.
Definition: bprint.h:91
int avfilter_link_get_channels(AVFilterLink *link)
Get the number of channels of a link.
Definition: avfilter.c:172
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:110
int av_bprint_finalize(AVBPrint *buf, char **ret_str)
Finalize a print buffer.
Definition: bprint.c:235
int av_frame_get_channels(const AVFrame *frame)
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:123
uint8_t * av_packet_new_side_data(AVPacket *pkt, enum AVPacketSideDataType type, int size)
Allocate new information of a packet.
Definition: avpacket.c:298
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1934
void av_bprint_init(AVBPrint *buf, unsigned size_init, unsigned size_max)
Init a print buffer.
Definition: bprint.c:69
static av_cold int lavfi_read_header(AVFormatContext *avctx)
Definition: lavfi.c:92
unsigned int nb_streams
A list of all streams in the file.
Definition: avformat.h:1015
int 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:127
Buffer to print data progressively.
Definition: bprint.h:77
static int av_bprint_is_complete(AVBPrint *buf)
Test if the print buffer is complete (not truncated).
Definition: bprint.h:182
void av_frame_unref(AVFrame *frame)
Unreference all the buffers referenced by frame and reset the frame fields.
Definition: frame.c:351
#define AV_OPT_SEARCH_CHILDREN
Search in possible children of the given object first.
Definition: opt.h:540
ret
Definition: avfilter.c:961
int width
picture width / height.
Definition: avcodec.h:1314
AVStream ** streams
Definition: avformat.h:1016
AVDictionary * av_frame_get_metadata(const AVFrame *frame)
void * av_malloc(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:73
char * value
Definition: dict.h:82
AVFilterGraph * avfilter_graph_alloc(void)
Allocate a filter graph.
Definition: avfiltergraph.c:77
int n
Definition: avisynth_c.h:588
unsigned int probesize
decoding: size of data to probe; encoding: unused.
Definition: avformat.h:1064
AVFilterContext ** sinks
Definition: lavfi.c:50
static int read_header(FFV1Context *f)
Definition: ffv1dec.c:592
const AVPixFmtDescriptor * av_pix_fmt_desc_get(enum AVPixelFormat pix_fmt)
Definition: pixdesc.c:1938
Stream structure.
Definition: avformat.h:667
A linked-list of the inputs/outputs of the filter chain.
Definition: avfilter.h:1338
int format
format of the frame, -1 if unknown or unset Values correspond to enum AVPixelFormat for video frames...
Definition: frame.h:157
AVSampleFormat
Audio Sample Formats.
Definition: samplefmt.h:49
#define AV_PIX_FMT_FLAG_HWACCEL
Pixel format is an HW accelerated format.
Definition: pixdesc.h:106
enum AVMediaType codec_type
Definition: avcodec.h:1154
A list of zero terminated key/value strings.
Definition: avcodec.h:985
#define FFMAX(a, b)
Definition: avcodec.h:923
enum AVCodecID av_get_pcm_codec(enum AVSampleFormat fmt, int be)
Return the PCM codec associated with a sample format.
Definition: utils.c:2907
enum AVCodecID codec_id
Definition: avcodec.h:1157
#define AV_TIME_BASE_Q
Internal time base represented as fractional value.
Definition: avcodec.h:2290
int sample_rate
samples per second
Definition: avcodec.h:1873
uint8_t flags
Definition: pixdesc.h:78
Descriptor that unambiguously describes how the bits of a pixel are stored in the up to 4 data planes...
Definition: pixdesc.h:57
Main libavdevice API header.
int * stream_sink_map
Definition: lavfi.c:53
static int read_packet(AVFormatContext *ctx, AVPacket *pkt)
Definition: libcdio.c:114
Describe the class of an AVClass context structure.
Definition: log.h:50
Filter definition.
Definition: avfilter.h:464
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:635
rational number numerator/denominator
Definition: rational.h:43
static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
Definition: lavfi.c:313
char * graph_filename
Definition: lavfi.c:47
uint8_t * data
Definition: avcodec.h:1063
AVMediaType
Definition: avutil.h:180
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:124
AVFilter * avfilter_get_by_name(const char *name)
Get a filter definition matching the given name.
Definition: avfilter.c:460
#define type
number of pixel formats, DO NOT USE THIS if you want to link with shared libav* because the number of...
Definition: avcodec.h:4730
#define FAIL(ERR)
static int flags
Definition: cpu.c:45
#define AVERROR_EOF
AVFilterGraph * graph
Definition: lavfi.c:49
char * graph_str
Definition: lavfi.c:46
void av_file_unmap(uint8_t *bufptr, size_t size)
Unmap or free the buffer bufptr created by av_file_map().
Definition: file.c:129
int den
denominator
Definition: rational.h:45
void av_bprintf(AVBPrint *buf, const char *fmt,...) av_printf_format(2
Append a formatted string to a print buffer.
int channels
number of audio channels
Definition: avcodec.h:1874
char * avfilter_graph_dump(AVFilterGraph *graph, const char *options)
Dump a graph into a human-readable string representation.
Definition: graphdump.c:153
AVFilterPad * output_pads
array of output pads
Definition: avfilter.h:641
int avpicture_get_size(enum AVPixelFormat pix_fmt, int width, int height)
Calculate the size in bytes that a picture of the given width and height would occupy if stored in th...
Definition: avpicture.c:49
#define AVERROR(e)
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:1904
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:523
An instance of a filter.
Definition: avfilter.h:627
static enum AVSampleFormat sample_fmts[]
Definition: adpcmenc.c:700
int height
Definition: frame.h:145
int av_file_map(const char *filename, uint8_t **bufptr, size_t *size, int log_offset, void *log_ctx)
Read the file with name filename, and put its content in a newly allocated buffer or map it with mmap...
Definition: file.c:49
void INT64 INT64 count
Definition: avisynth_c.h:594
#define AV_DICT_IGNORE_SUFFIX
Definition: dict.h:68
static AVPacket pkt
Definition: demuxing.c:52
static int * create_all_formats(int n)
Definition: lavfi.c:57
int stream_index
Definition: avcodec.h:1065
int av_get_bytes_per_sample(enum AVSampleFormat sample_fmt)
Return number of bytes per sample.
Definition: samplefmt.c:104
This structure stores compressed data.
Definition: avcodec.h:1040
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:150
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:107
int64_t av_frame_get_pkt_pos(const AVFrame *frame)
int64_t pts
Presentation timestamp in AVStream-&gt;time_base units; the time at which the decompressed packet will b...
Definition: avcodec.h:1056
for(j=16;j >0;--j)
#define tb
Definition: regdef.h:68
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:241
#define DEC
Definition: lavfi.c:410