FFmpeg
buffersink.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  * buffer sink
24  */
25 
26 #include "libavutil/avassert.h"
28 #include "libavutil/common.h"
29 #include "libavutil/internal.h"
30 #include "libavutil/opt.h"
31 
32 #define FF_INTERNAL_FIELDS 1
33 #include "framequeue.h"
34 
35 #include "audio.h"
36 #include "avfilter.h"
37 #include "buffersink.h"
38 #include "filters.h"
39 #include "internal.h"
40 
41 typedef struct BufferSinkContext {
42  const AVClass *class;
43  unsigned warning_limit;
44 
45  /* only used for video */
46  enum AVPixelFormat *pixel_fmts; ///< list of accepted pixel formats, must be terminated with -1
48 
49  /* only used for audio */
50  enum AVSampleFormat *sample_fmts; ///< list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
52  int64_t *channel_layouts; ///< list of accepted channel layouts, terminated by -1
54  int *channel_counts; ///< list of accepted channel counts, terminated by -1
57  int *sample_rates; ///< list of accepted sample rates, terminated by -1
59 
62 
63 #define NB_ITEMS(list) (list ## _size / sizeof(*list))
64 
66 {
67  return av_buffersink_get_frame_flags(ctx, frame, 0);
68 }
69 
71 {
72  if ((flags & AV_BUFFERSINK_FLAG_PEEK)) {
73  buf->peeked_frame = in;
74  return out ? av_frame_ref(out, in) : 0;
75  } else {
76  av_assert1(out);
77  buf->peeked_frame = NULL;
78  av_frame_move_ref(out, in);
79  av_frame_free(&in);
80  return 0;
81  }
82 }
83 
85 {
86  BufferSinkContext *buf = ctx->priv;
87  AVFilterLink *inlink = ctx->inputs[0];
88  int status, ret;
89  AVFrame *cur_frame;
90  int64_t pts;
91 
92  if (buf->peeked_frame)
93  return return_or_keep_frame(buf, frame, buf->peeked_frame, flags);
94 
95  while (1) {
96  ret = samples ? ff_inlink_consume_samples(inlink, samples, samples, &cur_frame) :
97  ff_inlink_consume_frame(inlink, &cur_frame);
98  if (ret < 0) {
99  return ret;
100  } else if (ret) {
101  /* TODO return the frame instead of copying it */
102  return return_or_keep_frame(buf, frame, cur_frame, flags);
103  } else if (ff_inlink_acknowledge_status(inlink, &status, &pts)) {
104  return status;
105  } else if ((flags & AV_BUFFERSINK_FLAG_NO_REQUEST)) {
106  return AVERROR(EAGAIN);
107  } else if (inlink->frame_wanted_out) {
108  ret = ff_filter_graph_run_once(ctx->graph);
109  if (ret < 0)
110  return ret;
111  } else {
112  ff_inlink_request_frame(inlink);
113  }
114  }
115 }
116 
118 {
119  return get_frame_internal(ctx, frame, flags, ctx->inputs[0]->min_samples);
120 }
121 
123  AVFrame *frame, int nb_samples)
124 {
125  return get_frame_internal(ctx, frame, 0, nb_samples);
126 }
127 
128 #if FF_API_NEXT
129 AVBufferSinkParams *av_buffersink_params_alloc(void)
130 {
131  static const int pixel_fmts[] = { AV_PIX_FMT_NONE };
132  AVBufferSinkParams *params = av_malloc(sizeof(AVBufferSinkParams));
133  if (!params)
134  return NULL;
135 
136  params->pixel_fmts = pixel_fmts;
137  return params;
138 }
139 
140 AVABufferSinkParams *av_abuffersink_params_alloc(void)
141 {
142  AVABufferSinkParams *params = av_mallocz(sizeof(AVABufferSinkParams));
143 
144  if (!params)
145  return NULL;
146  return params;
147 }
148 #endif
149 
151 {
152  BufferSinkContext *buf = ctx->priv;
153 
154  buf->warning_limit = 100;
155  return 0;
156 }
157 
159 {
160  BufferSinkContext *buf = ctx->priv;
161 
162  if (buf->warning_limit &&
163  ff_framequeue_queued_frames(&ctx->inputs[0]->fifo) >= buf->warning_limit) {
164  av_log(ctx, AV_LOG_WARNING,
165  "%d buffers queued in %s, something may be wrong.\n",
166  buf->warning_limit,
167  (char *)av_x_if_null(ctx->name, ctx->filter->name));
168  buf->warning_limit *= 10;
169  }
170 
171  /* The frame is queued, the rest is up to get_frame_internal */
172  return 0;
173 }
174 
176 {
177  AVFilterLink *inlink = ctx->inputs[0];
178 
179  inlink->min_samples = inlink->max_samples =
180  inlink->partial_buf_size = frame_size;
181 }
182 
183 #define MAKE_AVFILTERLINK_ACCESSOR(type, field) \
184 type av_buffersink_get_##field(const AVFilterContext *ctx) { \
185  av_assert0(ctx->filter->activate == activate); \
186  return ctx->inputs[0]->field; \
187 }
188 
192 
193 MAKE_AVFILTERLINK_ACCESSOR(AVRational , frame_rate )
196 MAKE_AVFILTERLINK_ACCESSOR(AVRational , sample_aspect_ratio)
197 
199 MAKE_AVFILTERLINK_ACCESSOR(uint64_t , channel_layout )
201 
202 MAKE_AVFILTERLINK_ACCESSOR(AVBufferRef * , hw_frames_ctx )
203 
204 #define CHECK_LIST_SIZE(field) \
205  if (buf->field ## _size % sizeof(*buf->field)) { \
206  av_log(ctx, AV_LOG_ERROR, "Invalid size for " #field ": %d, " \
207  "should be multiple of %d\n", \
208  buf->field ## _size, (int)sizeof(*buf->field)); \
209  return AVERROR(EINVAL); \
210  }
212 {
213  BufferSinkContext *buf = ctx->priv;
215  unsigned i;
216  int ret;
217 
219  if (buf->pixel_fmts_size) {
220  for (i = 0; i < NB_ITEMS(buf->pixel_fmts); i++)
221  if ((ret = ff_add_format(&formats, buf->pixel_fmts[i])) < 0)
222  return ret;
223  if ((ret = ff_set_common_formats(ctx, formats)) < 0)
224  return ret;
225  } else {
226  if ((ret = ff_default_query_formats(ctx)) < 0)
227  return ret;
228  }
229 
230  return 0;
231 }
232 
234 {
235  BufferSinkContext *buf = ctx->priv;
238  unsigned i;
239  int ret;
240 
245 
246  if (buf->sample_fmts_size) {
247  for (i = 0; i < NB_ITEMS(buf->sample_fmts); i++)
248  if ((ret = ff_add_format(&formats, buf->sample_fmts[i])) < 0)
249  return ret;
250  if ((ret = ff_set_common_formats(ctx, formats)) < 0)
251  return ret;
252  }
253 
254  if (buf->channel_layouts_size || buf->channel_counts_size ||
255  buf->all_channel_counts) {
256  for (i = 0; i < NB_ITEMS(buf->channel_layouts); i++)
257  if ((ret = ff_add_channel_layout(&layouts, buf->channel_layouts[i])) < 0)
258  return ret;
259  for (i = 0; i < NB_ITEMS(buf->channel_counts); i++)
260  if ((ret = ff_add_channel_layout(&layouts, FF_COUNT2LAYOUT(buf->channel_counts[i]))) < 0)
261  return ret;
262  if (buf->all_channel_counts) {
263  if (layouts)
264  av_log(ctx, AV_LOG_WARNING,
265  "Conflicting all_channel_counts and list in options\n");
266  else if (!(layouts = ff_all_channel_counts()))
267  return AVERROR(ENOMEM);
268  }
269  if ((ret = ff_set_common_channel_layouts(ctx, layouts)) < 0)
270  return ret;
271  }
272 
273  if (buf->sample_rates_size) {
274  formats = NULL;
275  for (i = 0; i < NB_ITEMS(buf->sample_rates); i++)
276  if ((ret = ff_add_format(&formats, buf->sample_rates[i])) < 0)
277  return ret;
278  if ((ret = ff_set_common_samplerates(ctx, formats)) < 0)
279  return ret;
280  }
281 
282  return 0;
283 }
284 
285 #define OFFSET(x) offsetof(BufferSinkContext, x)
286 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM
287 static const AVOption buffersink_options[] = {
288  { "pix_fmts", "set the supported pixel formats", OFFSET(pixel_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
289  { NULL },
290 };
291 #undef FLAGS
292 #define FLAGS AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
293 static const AVOption abuffersink_options[] = {
294  { "sample_fmts", "set the supported sample formats", OFFSET(sample_fmts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
295  { "sample_rates", "set the supported sample rates", OFFSET(sample_rates), AV_OPT_TYPE_BINARY, .flags = FLAGS },
296  { "channel_layouts", "set the supported channel layouts", OFFSET(channel_layouts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
297  { "channel_counts", "set the supported channel counts", OFFSET(channel_counts), AV_OPT_TYPE_BINARY, .flags = FLAGS },
298  { "all_channel_counts", "accept all channel counts", OFFSET(all_channel_counts), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS },
299  { NULL },
300 };
301 #undef FLAGS
302 
303 AVFILTER_DEFINE_CLASS(buffersink);
304 AVFILTER_DEFINE_CLASS(abuffersink);
305 
307  {
308  .name = "default",
309  .type = AVMEDIA_TYPE_VIDEO,
310  },
311  { NULL }
312 };
313 
315  .name = "buffersink",
316  .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
317  .priv_size = sizeof(BufferSinkContext),
318  .priv_class = &buffersink_class,
319  .init = common_init,
321  .activate = activate,
322  .inputs = avfilter_vsink_buffer_inputs,
323  .outputs = NULL,
324 };
325 
327  {
328  .name = "default",
329  .type = AVMEDIA_TYPE_AUDIO,
330  },
331  { NULL }
332 };
333 
335  .name = "abuffersink",
336  .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
337  .priv_class = &abuffersink_class,
338  .priv_size = sizeof(BufferSinkContext),
339  .init = common_init,
341  .activate = activate,
342  .inputs = avfilter_asink_abuffer_inputs,
343  .outputs = NULL,
344 };
int ff_inlink_consume_frame(AVFilterLink *link, AVFrame **rframe)
Take a frame from the link&#39;s FIFO and update the link&#39;s stats.
Definition: avfilter.c:1476
#define NULL
Definition: coverity.c:32
int ff_set_common_channel_layouts(AVFilterContext *ctx, AVFilterChannelLayouts *layouts)
A helper for query_formats() which sets all links to the same list of channel layouts/sample rates...
Definition: formats.c:581
enum AVSampleFormat * sample_fmts
list of accepted sample formats, terminated by AV_SAMPLE_FMT_NONE
Definition: buffersink.c:50
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
AVOption.
Definition: opt.h:246
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
Main libavfilter public API header.
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int * sample_rates
list of accepted sample rates, terminated by -1
Definition: buffersink.c:57
static const AVOption abuffersink_options[]
Definition: buffersink.c:293
int * channel_counts
list of accepted channel counts, terminated by -1
Definition: buffersink.c:54
GLint GLenum type
Definition: opengl_enc.c:104
static int return_or_keep_frame(BufferSinkContext *buf, AVFrame *out, AVFrame *in, int flags)
Definition: buffersink.c:70
void av_frame_move_ref(AVFrame *dst, AVFrame *src)
Move everything contained in src to dst and reset src.
Definition: frame.c:583
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:237
AVFrame * peeked_frame
Definition: buffersink.c:60
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 format(the sample packing is implied by the sample format) and sample rate.The lists are not just lists
void ff_inlink_request_frame(AVFilterLink *link)
Mark that a frame is wanted on the link.
Definition: avfilter.c:1602
struct AVFilterGraph * graph
filtergraph this filter belongs to
Definition: avfilter.h:355
memory buffer sink API for audio and video
const char * name
Pad name.
Definition: internal.h:60
int ff_filter_graph_run_once(AVFilterGraph *graph)
Run one round of processing on a filter graph.
AVFilterLink ** inputs
array of pointers to input links
Definition: avfilter.h:346
char * name
name of this filter instance
Definition: avfilter.h:343
#define av_cold
Definition: attributes.h:88
#define av_malloc(s)
AVOptions.
AVBufferSinkParams * av_buffersink_params_alloc(void)
Definition: buffersink.c:129
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:444
static const AVOption buffersink_options[]
Definition: buffersink.c:287
#define CHECK_LIST_SIZE(field)
Definition: buffersink.c:204
channels
Definition: aptx.h:33
#define FLAGS
Definition: buffersink.c:292
#define av_log(a,...)
#define AV_BUFFERSINK_FLAG_NO_REQUEST
Tell av_buffersink_get_buffer_ref() not to request a frame from its input.
Definition: buffersink.h:60
A filter pad used for either input or output.
Definition: internal.h:54
static void * av_x_if_null(const void *p, const void *x)
Return x default pointer in case p is NULL.
Definition: avutil.h:308
AVFILTER_DEFINE_CLASS(buffersink)
int ff_inlink_acknowledge_status(AVFilterLink *link, int *rstatus, int64_t *rpts)
Test and acknowledge the change of status on the link.
Definition: avfilter.c:1431
static int vsink_query_formats(AVFilterContext *ctx)
Definition: buffersink.c:211
AVABufferSinkParams * av_abuffersink_params_alloc(void)
Definition: buffersink.c:140
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
int ff_set_common_formats(AVFilterContext *ctx, AVFilterFormats *formats)
A helper for query_formats() which sets all links to the same list of formats.
Definition: formats.c:600
int ff_add_channel_layout(AVFilterChannelLayouts **l, uint64_t channel_layout)
Definition: formats.c:342
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
void * priv
private data for use by the filter
Definition: avfilter.h:353
static int activate(AVFilterContext *ctx)
Definition: buffersink.c:158
GLenum GLint * params
Definition: opengl_enc.c:113
simple assert() macros that are a bit more flexible than ISO C assert().
static const AVFilterPad avfilter_asink_abuffer_inputs[]
Definition: buffersink.c:326
int ff_add_format(AVFilterFormats **avff, int64_t fmt)
Add fmt to the list of media formats contained in *avff.
Definition: formats.c:336
int channel_layouts_size
Definition: buffersink.c:53
AVFilter ff_vsink_buffer
Definition: buffersink.c:314
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:117
common internal API header
int64_t * channel_layouts
list of accepted channel layouts, terminated by -1
Definition: buffersink.c:52
audio channel layout utility functions
#define av_assert1(cond)
assert() equivalent, that does not lie in speed critical code.
Definition: avassert.h:53
uint8_t w
Definition: llviddspenc.c:38
int attribute_align_arg av_buffersink_get_samples(AVFilterContext *ctx, AVFrame *frame, int nb_samples)
Same as av_buffersink_get_frame(), but with the ability to specify the number of samples read...
Definition: buffersink.c:122
AVFormatContext * ctx
Definition: movenc.c:48
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
enum AVPixelFormat * pixel_fmts
list of accepted pixel formats, must be terminated with -1
Definition: buffersink.c:46
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
offset must point to a pointer immediately followed by an int for the length
Definition: opt.h:229
AVFilter ff_asink_abuffer
Definition: buffersink.c:334
A list of supported channel layouts.
Definition: formats.h:85
int ff_default_query_formats(AVFilterContext *ctx)
Definition: formats.c:629
sample_rate
int frame_size
Definition: mxfenc.c:2139
#define OFFSET(x)
Definition: buffersink.c:285
AVSampleFormat
Audio sample formats.
Definition: samplefmt.h:58
int ff_inlink_consume_samples(AVFilterLink *link, unsigned min, unsigned max, AVFrame **rframe)
Take samples from the link&#39;s FIFO and update the link&#39;s stats.
Definition: avfilter.c:1495
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 inputs
uint8_t pi<< 24) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0f/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_U8, uint8_t,(*(const uint8_t *) pi-0x80)*(1.0/(1<< 7))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S16, int16_t,(*(const int16_t *) pi >> 8)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0f/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S16, int16_t,*(const int16_t *) pi *(1.0/(1<< 15))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_S32, int32_t,(*(const int32_t *) pi >> 24)+0x80) CONV_FUNC_GROUP(AV_SAMPLE_FMT_FLT, float, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0f/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_DBL, double, AV_SAMPLE_FMT_S32, int32_t,*(const int32_t *) pi *(1.0/(1U<< 31))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_FLT, float, av_clip_uint8(lrintf(*(const float *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_FLT, float, av_clip_int16(lrintf(*(const float *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_FLT, float, av_clipl_int32(llrintf(*(const float *) pi *(1U<< 31)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_U8, uint8_t, AV_SAMPLE_FMT_DBL, double, av_clip_uint8(lrint(*(const double *) pi *(1<< 7))+0x80)) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S16, int16_t, AV_SAMPLE_FMT_DBL, double, av_clip_int16(lrint(*(const double *) pi *(1<< 15)))) CONV_FUNC_GROUP(AV_SAMPLE_FMT_S32, int32_t, AV_SAMPLE_FMT_DBL, double, av_clipl_int32(llrint(*(const double *) pi *(1U<< 31))))#define SET_CONV_FUNC_GROUP(ofmt, ifmt) static void set_generic_function(AudioConvert *ac){}void ff_audio_convert_free(AudioConvert **ac){if(!*ac) return;ff_dither_free(&(*ac) ->dc);av_freep(ac);}AudioConvert *ff_audio_convert_alloc(AVAudioResampleContext *avr, enum AVSampleFormat out_fmt, enum AVSampleFormat in_fmt, int channels, int sample_rate, int apply_map){AudioConvert *ac;int in_planar, out_planar;ac=av_mallocz(sizeof(*ac));if(!ac) return NULL;ac->avr=avr;ac->out_fmt=out_fmt;ac->in_fmt=in_fmt;ac->channels=channels;ac->apply_map=apply_map;if(avr->dither_method!=AV_RESAMPLE_DITHER_NONE &&av_get_packed_sample_fmt(out_fmt)==AV_SAMPLE_FMT_S16 &&av_get_bytes_per_sample(in_fmt) > 2){ac->dc=ff_dither_alloc(avr, out_fmt, in_fmt, channels, sample_rate, apply_map);if(!ac->dc){av_free(ac);return NULL;}return ac;}in_planar=ff_sample_fmt_is_planar(in_fmt, channels);out_planar=ff_sample_fmt_is_planar(out_fmt, channels);if(in_planar==out_planar){ac->func_type=CONV_FUNC_TYPE_FLAT;ac->planes=in_planar?ac->channels:1;}else if(in_planar) ac->func_type=CONV_FUNC_TYPE_INTERLEAVE;else ac->func_type=CONV_FUNC_TYPE_DEINTERLEAVE;set_generic_function(ac);if(ARCH_AARCH64) ff_audio_convert_init_aarch64(ac);if(ARCH_ARM) ff_audio_convert_init_arm(ac);if(ARCH_X86) ff_audio_convert_init_x86(ac);return ac;}int ff_audio_convert(AudioConvert *ac, AudioData *out, AudioData *in){int use_generic=1;int len=in->nb_samples;int p;if(ac->dc){av_log(ac->avr, AV_LOG_TRACE,"%d samples - audio_convert: %s to %s (dithered)\n", len, av_get_sample_fmt_name(ac->in_fmt), av_get_sample_fmt_name(ac->out_fmt));return ff_convert_dither(ac-> in
Describe the class of an AVClass context structure.
Definition: log.h:67
Filter definition.
Definition: avfilter.h:144
Rational number (pair of numerator and denominator).
Definition: rational.h:58
they must not be accessed directly The fifo field contains the frames that are queued in the input for processing by the filter The status_in and status_out fields contains the queued status(EOF or error) of the link
#define NB_ITEMS(list)
Definition: buffersink.c:63
AVMediaType
Definition: avutil.h:199
const char * name
Filter name.
Definition: avfilter.h:148
enum MovChannelLayoutTag * layouts
Definition: mov_chan.c:434
static int64_t pts
#define flags(name, subs,...)
Definition: cbs_av1.c:564
The exact code depends on how similar the blocks are and how related they are to the and needs to apply these operations to the correct inlink or outlink if there are several Macros are available to factor that when no extra processing is inlink
static int get_frame_internal(AVFilterContext *ctx, AVFrame *frame, int flags, int samples)
Definition: buffersink.c:84
A reference to a data buffer.
Definition: buffer.h:81
static int query_formats(AVFilterContext *ctx)
Definition: aeval.c:244
static size_t ff_framequeue_queued_frames(const FFFrameQueue *fq)
Get the number of queued frames.
Definition: framequeue.h:146
common internal and external API header
void av_buffersink_set_frame_size(AVFilterContext *ctx, unsigned frame_size)
Set the frame size for an audio buffer sink.
Definition: buffersink.c:175
static av_cold int common_init(AVFilterContext *ctx)
Definition: buffersink.c:150
#define AV_BUFFERSINK_FLAG_PEEK
Tell av_buffersink_get_buffer_ref() to read video/samples buffer reference, but not remove it from th...
Definition: buffersink.h:53
static int asink_query_formats(AVFilterContext *ctx)
Definition: buffersink.c:233
A list of supported formats for one end of a filter link.
Definition: formats.h:64
An instance of a filter.
Definition: avfilter.h:338
FILE * out
Definition: movenc.c:54
Filter the word “frame” indicates either a video frame or a group of audio samples
#define FF_COUNT2LAYOUT(c)
Encode a channel count as a channel layout.
Definition: formats.h:102
static const AVFilterPad avfilter_vsink_buffer_inputs[]
Definition: buffersink.c:306
formats
Definition: signature.h:48
internal API functions
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
AVFilterChannelLayouts * ff_all_channel_counts(void)
Construct an AVFilterChannelLayouts coding for any channel layout, with known or unknown disposition...
Definition: formats.c:440
#define MAKE_AVFILTERLINK_ACCESSOR(type, field)
Definition: buffersink.c:183
int attribute_align_arg av_buffersink_get_frame(AVFilterContext *ctx, AVFrame *frame)
Get a frame with filtered data from sink and put it in frame.
Definition: buffersink.c:65
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
unsigned warning_limit
Definition: buffersink.c:43
const AVFilter * filter
the AVFilter of which this is an instance
Definition: avfilter.h:341
int ff_set_common_samplerates(AVFilterContext *ctx, AVFilterFormats *samplerates)
Definition: formats.c:588