buffersrc.c File Reference

memory buffer source filter More...

#include <float.h>
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/frame.h"
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/opt.h"
#include "libavutil/samplefmt.h"
#include "libavutil/timestamp.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, pts)
#define	CHECK_AUDIO_PARAM_CHANGE(s, c, srate, ch_layout, ch_count, format, pts)
#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

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...
static int	push_frame (AVFilterGraph *graph)
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...
static av_cold int	init_video (AVFilterContext *ctx)
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)
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)

Variables
static const AVOption	buffer_options []
static const AVOption	abuffer_options []
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

CHECK_VIDEO_PARAM_CHANGE

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

Value:

    if (c->w != width || c->h != height || c->pix_fmt != format) {\
        av_log(s, AV_LOG_INFO, "filter context - w: %d h: %d fmt: %d, incoming frame - w: %d h: %d fmt: %d pts_time: %s\n",\
               c->w, c->h, c->pix_fmt, width, height, format, av_ts2timestr(pts, &s->outputs[0]->time_base));\
        av_log(s, AV_LOG_WARNING, "Changing video frame properties on the fly is not supported by all filters.\n");\
    }

Definition at line 70 of file buffersrc.c.

CHECK_AUDIO_PARAM_CHANGE

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

Value:

    if (c->sample_fmt != format || c->sample_rate != srate ||\
        c->channel_layout != ch_layout || c->channels != ch_count) {\
        av_log(s, AV_LOG_INFO, "filter context - fmt: %s r: %d layout: %"PRIX64" ch: %d, incoming frame - fmt: %s r: %d layout: %"PRIX64" ch: %d pts_time: %s\n",\
               av_get_sample_fmt_name(c->sample_fmt), c->sample_rate, c->channel_layout, c->channels,\
               av_get_sample_fmt_name(format), srate, ch_layout, ch_count, av_ts2timestr(pts, &s->outputs[0]->time_base));\
        av_log(s, AV_LOG_ERROR, "Changing audio frame properties on the fly is not supported.\n");\
        return AVERROR(EINVAL);\
    }

Definition at line 77 of file buffersrc.c.

OFFSET

#define OFFSET

(

x

)

offsetof(BufferSourceContext, x)

Definition at line 270 of file buffersrc.c.

A

#define A   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

Definition at line 271 of file buffersrc.c.

V

#define V   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 272 of file buffersrc.c.

Function Documentation

push_frame()

static int push_frame ( AVFilterGraph *  graph )

static

Definition at line 152 of file buffersrc.c.

Referenced by av_buffersrc_add_frame_flags(), and av_buffersrc_close().

init_video()

static av_cold int init_video ( AVFilterContext *  ctx )

static

Definition at line 242 of file buffersrc.c.

AVFILTER_DEFINE_CLASS() [1/2]

AVFILTER_DEFINE_CLASS

(

buffer

)

AVFILTER_DEFINE_CLASS() [2/2]

AVFILTER_DEFINE_CLASS

(

abuffer

)

init_audio()

static av_cold int init_audio ( AVFilterContext *  ctx )

static

Definition at line 302 of file buffersrc.c.

uninit()

static av_cold void uninit ( AVFilterContext *  ctx )

static

Definition at line 356 of file buffersrc.c.

query_formats()

static int query_formats ( AVFilterContext *  ctx )

static

Definition at line 362 of file buffersrc.c.

config_props()

static int config_props ( AVFilterLink *  link )

static

Definition at line 397 of file buffersrc.c.

request_frame()

static int request_frame ( AVFilterLink *  link )

static

Definition at line 426 of file buffersrc.c.

Variable Documentation

buffer_options

const AVOption buffer_options[]

static

Initial value:

= {
    { "width",         NULL,                     OFFSET(w),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
    { "video_size",    NULL,                     OFFSET(w),                AV_OPT_TYPE_IMAGE_SIZE,                .flags = V },
    { "height",        NULL,                     OFFSET(h),                AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, V },
    { "pix_fmt",       NULL,                     OFFSET(pix_fmt),          AV_OPT_TYPE_PIXEL_FMT, { .i64 = AV_PIX_FMT_NONE }, .min = AV_PIX_FMT_NONE, .max = INT_MAX, .flags = V },
    { "sar",           "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
    { "pixel_aspect",  "sample aspect ratio",    OFFSET(pixel_aspect),     AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
    { "time_base",     NULL,                     OFFSET(time_base),        AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
    { "frame_rate",    NULL,                     OFFSET(frame_rate),       AV_OPT_TYPE_RATIONAL, { .dbl = 0 }, 0, DBL_MAX, V },
 
    { "sws_param",     NULL,                     OFFSET(sws_param),        AV_OPT_TYPE_STRING,                    .flags = V },
 
    { NULL },
}

Definition at line 274 of file buffersrc.c.

abuffer_options

const AVOption abuffer_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),          AV_OPT_TYPE_SAMPLE_FMT, { .i64 = AV_SAMPLE_FMT_NONE }, .min = AV_SAMPLE_FMT_NONE, .max = INT_MAX, .flags = A },
    { "channel_layout", NULL, OFFSET(channel_layout_str),  AV_OPT_TYPE_STRING,             .flags = A },
    { "channels",       NULL, OFFSET(channels),            AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
    { NULL },
}

Definition at line 291 of file buffersrc.c.

avfilter_vsrc_buffer_outputs

const AVFilterPad avfilter_vsrc_buffer_outputs[]

static

Initial value:

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

Definition at line 436 of file buffersrc.c.

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,
}

Definition at line 446 of file buffersrc.c.

avfilter_asrc_abuffer_outputs

const AVFilterPad avfilter_asrc_abuffer_outputs[]

static

Initial value:

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

Definition at line 460 of file buffersrc.c.

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,
}

Definition at line 470 of file buffersrc.c.