libavfilter/sink_buffer.c File Reference

buffer sink More...

#include "libavutil/audioconvert.h"
#include "libavutil/avassert.h"
#include "libavutil/fifo.h"
#include "avfilter.h"
#include "buffersink.h"
#include "audio.h"
#include "internal.h"

Go to the source code of this file.

Data Structures

struct  BufferSinkContext

Defines

#define FIFO_INIT_SIZE   8

Functions

AVBufferSinkParamsav_buffersink_params_alloc (void)
 Create an AVBufferSinkParams structure.
AVABufferSinkParamsav_abuffersink_params_alloc (void)
 Create an AVABufferSinkParams structure.
static av_cold int common_init (AVFilterContext *ctx)
static av_cold void common_uninit (AVFilterContext *ctx)
static int add_buffer_ref (AVFilterContext *ctx, AVFilterBufferRef *ref)
static int end_frame (AVFilterLink *inlink)
void av_buffersink_set_frame_size (AVFilterContext *ctx, unsigned frame_size)
 Set the frame size for an audio buffer sink.
int av_buffersink_get_buffer_ref (AVFilterContext *ctx, AVFilterBufferRef **bufref, int flags)
 Get an audio/video buffer data from buffer_sink and put it in bufref.
AVRational av_buffersink_get_frame_rate (AVFilterContext *ctx)
 Get the frame rate of the input.
int av_buffersink_poll_frame (AVFilterContext *ctx)
 Get the number of immediately available frames.
static av_cold int vsink_init (AVFilterContext *ctx, const char *args, void *opaque)
static av_cold void vsink_uninit (AVFilterContext *ctx)
static int vsink_query_formats (AVFilterContext *ctx)
static int filter_samples (AVFilterLink *link, AVFilterBufferRef *samplesref)
static av_cold int asink_init (AVFilterContext *ctx, const char *args, void *opaque)
static av_cold void asink_uninit (AVFilterContext *ctx)
static int asink_query_formats (AVFilterContext *ctx)
int av_buffersink_read (AVFilterContext *ctx, AVFilterBufferRef **buf)
 Get a buffer with filtered data from sink and put it in buf.
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.

Variables

AVFilter avfilter_vsink_ffbuffersink
AVFilter avfilter_vsink_buffersink
AVFilter avfilter_asink_ffabuffersink
AVFilter avfilter_asink_abuffersink
AVFilter avfilter_vsink_buffer
AVFilter avfilter_asink_abuffer


Detailed Description

buffer sink

Definition in file sink_buffer.c.


Define Documentation

#define FIFO_INIT_SIZE   8

Definition at line 71 of file sink_buffer.c.

Referenced by common_init().


Function Documentation

static int add_buffer_ref ( AVFilterContext ctx,
AVFilterBufferRef ref 
) [static]

Definition at line 101 of file sink_buffer.c.

Referenced by av_buffersink_read_samples(), and end_frame().

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

Definition at line 277 of file sink_buffer.c.

static int asink_query_formats ( AVFilterContext ctx  )  [static]

Definition at line 310 of file sink_buffer.c.

static av_cold void asink_uninit ( AVFilterContext ctx  )  [static]

Definition at line 301 of file sink_buffer.c.

AVABufferSinkParams* av_abuffersink_params_alloc ( void   ) 

Create an AVABufferSinkParams structure.

Must be freed with av_free().

Definition at line 45 of file sink_buffer.c.

Referenced by init_filters(), and lavfi_read_header().

int av_buffersink_get_buffer_ref ( AVFilterContext buffer_sink,
AVFilterBufferRef **  bufref,
int  flags 
)

Get an audio/video buffer data from buffer_sink and put it in bufref.

This function works with both audio and video buffer sinks.

Parameters:
buffer_sink pointer to a buffersink or abuffersink context
flags a combination of AV_BUFFERSINK_FLAG_* flags
Returns:
>= 0 in case of success, a negative AVERROR code in case of failure

Definition at line 149 of file sink_buffer.c.

Referenced by av_buffersink_read(), av_buffersink_read_samples(), lavfi_read_packet(), main(), reap_filters(), and video_thread().

AVRational av_buffersink_get_frame_rate ( AVFilterContext ctx  ) 

Get the frame rate of the input.

Definition at line 181 of file sink_buffer.c.

Referenced by transcode_init().

AVBufferSinkParams* av_buffersink_params_alloc ( void   ) 

Create an AVBufferSinkParams structure.

Must be freed with av_free().

Definition at line 34 of file sink_buffer.c.

Referenced by configure_output_video_filter(), init_filters(), and lavfi_read_header().

int av_buffersink_poll_frame ( AVFilterContext ctx  ) 

Get the number of immediately available frames.

Definition at line 189 of file sink_buffer.c.

void av_buffersink_set_frame_size ( AVFilterContext ctx,
unsigned  frame_size 
)

Set the frame size for an audio buffer sink.

All calls to av_buffersink_get_buffer_ref will return a buffer with exactly the specified number of samples, or AVERROR(EAGAIN) if there is not enough. The last buffer at EOF will be padded with 0.

Definition at line 141 of file sink_buffer.c.

Referenced by decode_audio(), and transcode_init().

static av_cold int common_init ( AVFilterContext ctx  )  [static]

Definition at line 73 of file sink_buffer.c.

static av_cold void common_uninit ( AVFilterContext ctx  )  [static]

Definition at line 86 of file sink_buffer.c.

Referenced by asink_uninit(), and vsink_uninit().

static int end_frame ( AVFilterLink inlink  )  [static]

Definition at line 120 of file sink_buffer.c.

static int filter_samples ( AVFilterLink link,
AVFilterBufferRef samplesref 
) [static]

Definition at line 271 of file sink_buffer.c.

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

Definition at line 202 of file sink_buffer.c.

static int vsink_query_formats ( AVFilterContext ctx  )  [static]

Definition at line 225 of file sink_buffer.c.

static av_cold void vsink_uninit ( AVFilterContext ctx  )  [static]

Definition at line 218 of file sink_buffer.c.


Variable Documentation

Definition at line 162 of file buffersink.c.

Referenced by avfilter_register_all().

Initial value:

 {
    .name      = "abuffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
    .init_opaque = asink_init,
    .uninit    = asink_uninit,
    .priv_size = sizeof(BufferSinkContext),
    .query_formats = asink_query_formats,

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

Definition at line 347 of file sink_buffer.c.

Initial value:

 {
    .name      = "ffabuffersink",
    .description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them available to the end of the filter graph."),
    .init_opaque = asink_init,
    .uninit    = asink_uninit,
    .priv_size = sizeof(BufferSinkContext),
    .query_formats = asink_query_formats,

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

Definition at line 331 of file sink_buffer.c.

Definition at line 143 of file buffersink.c.

Referenced by avfilter_register_all().

Initial value:

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

    .query_formats = vsink_query_formats,

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

Definition at line 254 of file sink_buffer.c.

Initial value:

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

    .query_formats = vsink_query_formats,

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

Definition at line 237 of file sink_buffer.c.


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