buffersrc.c File Reference

memory buffer source filter More...

#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/fifo.h"
#include "libavutil/imgutils.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"

Go to the source code of this file.

Data Structures
struct	BufferSourceContext

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

Functions
int	av_buffersrc_write_frame (AVFilterContext *buffer_filter, const AVFrame *frame)
	Add a frame to the buffer source. More...
int	av_buffersrc_buffer (AVFilterContext *s, AVFilterBufferRef *buf)
	Add a buffer to the filtergraph s. More...
static av_cold int	init_video (AVFilterContext *ctx, const char *args)
static av_cold int	init_audio (AVFilterContext *ctx, const char *args)
static av_cold void	uninit (AVFilterContext *ctx)
static int	query_formats (AVFilterContext *ctx)
static int	config_props (AVFilterLink *link)
static int	request_frame (AVFilterLink *link)
static int	poll_frame (AVFilterLink *link)

Variables
static const AVOption	audio_options []
static const AVClass	abuffer_class
static const AVFilterPad	avfilter_vsrc_buffer_outputs []
AVFilter	avfilter_vsrc_buffer
static const AVFilterPad	avfilter_asrc_abuffer_outputs []
AVFilter	avfilter_asrc_abuffer

Detailed Description

memory buffer source filter

Definition in file buffersrc.c.

Macro Definition Documentation

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 192 of file buffersrc.c.

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

Value:

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

Definition at line 65 of file buffersrc.c.

Referenced by av_buffersrc_buffer(), and av_buffersrc_write_frame().

#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_ERROR, "Changing frame properties on the fly is not supported.\n");\
        return AVERROR(EINVAL);\
    }

Definition at line 59 of file buffersrc.c.

Referenced by av_buffersrc_buffer(), and av_buffersrc_write_frame().

#define OFFSET

(

x

)

offsetof(BufferSourceContext, x)

Definition at line 191 of file buffersrc.c.

Function Documentation

int av_buffersrc_buffer	(	AVFilterContext *	s,
		AVFilterBufferRef *	buf
	)

Add a buffer to the filtergraph s.

Parameters

buf	buffer containing frame data to be passed down the filtergraph. This function will take ownership of buf, the user must not free it. A NULL buf signals EOF – i.e. no more frames will be sent to this filter.

Definition at line 128 of file buffersrc.c.

Referenced by decode_audio(), decode_video(), and video_thread().

int av_buffersrc_write_frame	(	AVFilterContext *	s,
		const AVFrame *	frame
	)

Add a frame to the buffer source.

Parameters

s	an instance of the buffersrc filter.
frame	frame to be added.

Warning

frame data will be memcpy()ed, which may be a big performance hit. Use av_buffersrc_buffer() to avoid copying the data.

Definition at line 72 of file buffersrc.c.

Referenced by decode_video(), and video_thread().

static int config_props ( AVFilterLink *  link )

static

Definition at line 295 of file buffersrc.c.

static av_cold int init_audio ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 208 of file buffersrc.c.

static av_cold int init_video ( AVFilterContext *  ctx, const char *  args  )

static

Definition at line 162 of file buffersrc.c.

static int poll_frame ( AVFilterLink *  link )

static

Definition at line 335 of file buffersrc.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 266 of file buffersrc.c.

static int request_frame ( AVFilterLink *  link )

static

Definition at line 317 of file buffersrc.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 254 of file buffersrc.c.

Variable Documentation

const AVClass abuffer_class

static

Initial value:

= {
    .class_name = "abuffer source",
    .item_name  = av_default_item_name,
    .option     = audio_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 201 of file buffersrc.c.

Referenced by init_audio().

const AVOption audio_options[]

static

Initial value:

= {
    { "time_base",      NULL, OFFSET(time_base),           AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, INT_MAX, A },
    { "sample_rate",    NULL, OFFSET(sample_rate),         AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
    { "sample_fmt",     NULL, OFFSET(sample_fmt_str),      AV_OPT_TYPE_STRING,             .flags = A },
    { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
    { NULL },
}

Definition at line 193 of file buffersrc.c.

AVFilter avfilter_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,
}

Definition at line 379 of file buffersrc.c.

const AVFilterPad avfilter_asrc_abuffer_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_AUDIO,
        .request_frame = request_frame,
        .poll_frame    = poll_frame,
        .config_props  = config_props,
    },
    { NULL }
}

Definition at line 368 of file buffersrc.c.

AVFilter avfilter_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,
}

Definition at line 355 of file buffersrc.c.

const AVFilterPad avfilter_vsrc_buffer_outputs[]

static

Initial value:

= {
    {
        .name          = "default",
        .type          = AVMEDIA_TYPE_VIDEO,
        .request_frame = request_frame,
        .poll_frame    = poll_frame,
        .config_props  = config_props,
    },
    { NULL }
}

Definition at line 344 of file buffersrc.c.