buffersrc.c File Reference

memory buffer source filter More...

#include <float.h>
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "audio.h"
#include "avfilter.h"
#include "buffersrc.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

Classes
struct	BufferSourceContext

Macros
#define	CHECK_VIDEO_PARAM_CHANGE(s, c, width, height, format)
#define	CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format)
#define	OFFSET(x)   offsetof(BufferSourceContext, x)
#define	A   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM
#define	V   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Typedefs
typedef struct BufferSourceContext	BufferSourceContext

Functions
AVBufferSrcParameters *	av_buffersrc_parameters_alloc (void)
	Allocate a new AVBufferSrcParameters instance. More...
int	av_buffersrc_parameters_set (AVFilterContext *ctx, AVBufferSrcParameters *param)
	Initialize the buffersrc or abuffersrc filter with the provided parameters. More...
int attribute_align_arg	av_buffersrc_write_frame (AVFilterContext *ctx, const AVFrame *frame)
	Add a frame to the buffer source. More...
int attribute_align_arg	av_buffersrc_add_frame (AVFilterContext *ctx, AVFrame *frame)
	Add a frame to the buffer source. More...
int attribute_align_arg	av_buffersrc_add_frame_flags (AVFilterContext *ctx, AVFrame *frame, int flags)
	Add a frame to the buffer source. More...
int	av_buffersrc_close (AVFilterContext *ctx, int64_t pts, unsigned flags)
	Close the buffer source after EOF. More...
unsigned	av_buffersrc_get_nb_failed_requests (AVFilterContext *buffer_src)
	Get the number of failed requests. More...
	AVFILTER_DEFINE_CLASS (buffer)
	AVFILTER_DEFINE_CLASS (abuffer)

Variables
AVFilter	ff_vsrc_buffer
AVFilter	ff_asrc_abuffer

Detailed Description

memory buffer source filter

Macro Definition Documentation

CHECK_AUDIO_PARAM_CHANGE

#define CHECK_AUDIO_PARAM_CHANGE	(		s,
			c,
			srate,
			ch_layout,
			ch_count,
			format
	)

Value:

if (c->sample_fmt != format || c->sample_rate != srate ||\
        c->channel_layout != ch_layout || c->channels != ch_count) {\
        av_log(s, AV_LOG_ERROR, "Changing frame properties on the fly is not supported.\n");\
        return AVERROR(EINVAL);\
    }

CHECK_VIDEO_PARAM_CHANGE

#define CHECK_VIDEO_PARAM_CHANGE	(		s,
			c,
			width,
			height,
			format
	)

Value:

if (c->w != width || c->h != height || c->pix_fmt != format) {\
        av_log(s, AV_LOG_INFO, "Changing frame properties on the fly is not supported by all filters.\n");\
    }

Variable Documentation

ff_asrc_abuffer

AVFilter ff_asrc_abuffer

Initial value:

= {
    .name          = "abuffer",
    .description   = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
    .priv_size     = sizeof(BufferSourceContext),
    .query_formats = query_formats,

    .init      = init_audio,
    .uninit    = uninit,

    .inputs    = NULL,
    .outputs   = avfilter_asrc_abuffer_outputs,
    .priv_class = &abuffer_class,
}

ff_vsrc_buffer

AVFilter ff_vsrc_buffer

Initial value:

= {
    .name      = "buffer",
    .description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
    .priv_size = sizeof(BufferSourceContext),
    .query_formats = query_formats,

    .init      = init_video,
    .uninit    = uninit,

    .inputs    = NULL,
    .outputs   = avfilter_vsrc_buffer_outputs,
    .priv_class = &buffer_class,
}