libavfilter/buffersink.c File Reference

buffer sink More...

#include "libavutil/audio_fifo.h"
#include "libavutil/audioconvert.h"
#include "libavutil/fifo.h"
#include "libavutil/mathematics.h"
#include "audio.h"
#include "avfilter.h"
#include "buffersink.h"

Go to the source code of this file.

Data Structures
struct	BufferSinkContext
Defines
#define	FIFO_INIT_SIZE   8
Functions
static av_cold void	uninit (AVFilterContext *ctx)
static av_cold int	init (AVFilterContext *ctx, const char *args, void *opaque)
static void	write_buf (AVFilterContext *ctx, AVFilterBufferRef *buf)
static void	end_frame (AVFilterLink *link)
static void	filter_samples (AVFilterLink *link, AVFilterBufferRef *buf)
int	av_buffersink_read (AVFilterContext *ctx, AVFilterBufferRef **buf)
	Get a buffer with filtered data from sink and put it in buf.
static int	read_from_fifo (AVFilterContext *ctx, AVFilterBufferRef **pbuf, int nb_samples)
int	av_buffersink_read_samples (AVFilterContext *ctx, AVFilterBufferRef **pbuf, int nb_samples)
	Same as av_buffersink_read, but with the ability to specify the number of samples read.
Variables
AVFilter	avfilter_vsink_buffer
AVFilter	avfilter_asink_abuffer

---

Detailed Description

buffer sink

Definition in file buffersink.c.

---

Define Documentation

#define FIFO_INIT_SIZE   8

Definition at line 42 of file buffersink.c.

Referenced by common_init(), and init().

---

Function Documentation

int av_buffersink_read	(	AVFilterContext *	sink,
		AVFilterBufferRef **	buf
	)

Get a buffer with filtered data from sink and put it in buf.

Parameters:

	sink	pointer to a context of a buffersink or abuffersink AVFilter.
	buf	pointer to the buffer will be written here if buf is non-NULL. buf must be freed by the caller using avfilter_unref_buffer(). Buf may also be NULL to query whether a buffer is ready to be output.

Returns:

>= 0 in case of success, a negative AVERROR code in case of failure.

Definition at line 95 of file buffersink.c.

Referenced by av_buffersink_read_samples(), and poll_filters().

int av_buffersink_read_samples	(	AVFilterContext *	ctx,
		AVFilterBufferRef **	buf,
		int	nb_samples
	)

Same as av_buffersink_read, but with the ability to specify the number of samples read.

This function is less efficient than av_buffersink_read(), because it copies the data around.

Parameters:

	sink	pointer to a context of the abuffersink AVFilter.
	buf	pointer to the buffer will be written here if buf is non-NULL. buf must be freed by the caller using avfilter_unref_buffer(). buf will contain exactly nb_samples audio samples, except at the end of stream, when it can contain less than nb_samples. Buf may also be NULL to query whether a buffer is ready to be output.

Warning:

do not mix this function with av_buffersink_read(). Use only one or the other with a single sink, not both.

Definition at line 140 of file buffersink.c.

Referenced by poll_filters().

static void end_frame

(

AVFilterLink *

link

)

[static]

Definition at line 84 of file buffersink.c.

static void filter_samples	(	AVFilterLink *	link,
		AVFilterBufferRef *	buf
	)			[static]

Definition at line 90 of file buffersink.c.

static av_cold int init	(	AVFilterContext *	ctx,
		const char *	args,
		void *	opaque
	)			[static]

Definition at line 59 of file buffersink.c.

static int read_from_fifo	(	AVFilterContext *	ctx,
		AVFilterBufferRef **	pbuf,
		int	nb_samples
	)			[static]

Definition at line 120 of file buffersink.c.

Referenced by av_buffersink_read_samples().

static av_cold void uninit

(

AVFilterContext *

ctx

)

[static]

Definition at line 44 of file buffersink.c.

static void write_buf	(	AVFilterContext *	ctx,
		AVFilterBufferRef *	buf
	)			[static]

Definition at line 71 of file buffersink.c.

Referenced by end_frame(), and filter_samples().

---

Variable Documentation

AVFilter avfilter_asink_abuffer

Initial value:

 {
    .name      = "abuffersink_old",
    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
    .priv_size = sizeof(BufferSinkContext),
    .init      = init,
    .uninit    = uninit,

    .inputs    = (AVFilterPad[]) {{ .name           = "default",
                                    .type           = AVMEDIA_TYPE_AUDIO,
                                    .filter_samples = filter_samples,
                                    .min_perms      = AV_PERM_READ, },
                                  { .name = NULL }},
    .outputs   = (AVFilterPad[]) {{ .name = NULL }},
}

Definition at line 195 of file buffersink.c.

Referenced by avfilter_register_all().

AVFilter avfilter_vsink_buffer

Initial value:

 {
    .name      = "buffersink_old",
    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them available to the end of the filter graph."),
    .priv_size = sizeof(BufferSinkContext),
    .init      = init,
    .uninit    = uninit,

    .inputs    = (AVFilterPad[]) {{ .name          = "default",
                                    .type          = AVMEDIA_TYPE_VIDEO,
                                    .end_frame     = end_frame,
                                    .min_perms     = AV_PERM_READ, },
                                  { .name = NULL }},
    .outputs   = (AVFilterPad[]) {{ .name = NULL }},
}

Definition at line 180 of file buffersink.c.

Referenced by avfilter_register_all().