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"

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
#define	V   AV_OPT_FLAG_VIDEO_PARAM

Functions
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...
static av_cold int	init_video (AVFilterContext *ctx)
static av_cold int	init_audio (AVFilterContext *ctx)
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	video_options []
static const AVClass	buffer_class
static const AVOption	audio_options []
static const AVClass	abuffer_class
static const AVFilterPad	avfilter_vsrc_buffer_outputs []
AVFilter	ff_vsrc_buffer
static const AVFilterPad	avfilter_asrc_abuffer_outputs []
AVFilter	ff_asrc_abuffer

Detailed Description

memory buffer source filter

Definition in file buffersrc.c.

Macro Definition Documentation

#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 64 of file buffersrc.c.

Referenced by av_buffersrc_add_frame().

#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 70 of file buffersrc.c.

Referenced by av_buffersrc_add_frame().

#define OFFSET

(

x

)

offsetof(BufferSourceContext, x)

Definition at line 280 of file buffersrc.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 281 of file buffersrc.c.

#define V   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 282 of file buffersrc.c.

Function Documentation

static av_cold int init_video ( AVFilterContext *  ctx )

static

Definition at line 255 of file buffersrc.c.

static av_cold int init_audio ( AVFilterContext *  ctx )

static

Definition at line 323 of file buffersrc.c.

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 355 of file buffersrc.c.

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 367 of file buffersrc.c.

static int config_props ( AVFilterLink *  link )

static

Definition at line 396 of file buffersrc.c.

static int request_frame ( AVFilterLink *  link )

static

Definition at line 418 of file buffersrc.c.

static int poll_frame ( AVFilterLink *  link )

static

Definition at line 436 of file buffersrc.c.

Variable Documentation

const AVOption video_options[]

static

Initial value:

= {
    { "width",         NULL,                     OFFSET(w),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
    { "height",        NULL,                     OFFSET(h),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
    { "pix_fmt",       NULL,                     OFFSET(pix_fmt_str),      AV_OPT_TYPE_STRING,                    .flags = V },








    { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 1 }, 0, DBL_MAX, V },
    { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
    { NULL },
}

Definition at line 284 of file buffersrc.c.

const AVClass buffer_class

static

Initial value:

= {
    .class_name = "buffer source",
    .item_name  = av_default_item_name,
    .option     = video_options,
    .version    = LIBAVUTIL_VERSION_INT,
}

Definition at line 301 of file buffersrc.c.

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 308 of file buffersrc.c.

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 316 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 445 of file buffersrc.c.

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),
    .priv_class = &buffer_class,
    .query_formats = query_formats,

    .init      = init_video,
    .uninit    = uninit,

    .inputs    = NULL,
    .outputs   = avfilter_vsrc_buffer_outputs,
}

Definition at line 456 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 470 of file buffersrc.c.

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),
    .priv_class    = &abuffer_class,
    .query_formats = query_formats,

    .init      = init_audio,
    .uninit    = uninit,

    .inputs    = NULL,
    .outputs   = avfilter_asrc_abuffer_outputs,
}

Definition at line 481 of file buffersrc.c.