buffersrc.c File Reference

memory buffer source filter More...

#include <float.h>
#include "libavutil/channel_layout.h"
#include "libavutil/frame.h"
#include "libavutil/hwcontext.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/samplefmt.h"
#include "libavutil/timestamp.h"
#include "avfilter.h"
#include "avfilter_internal.h"
#include "buffersrc.h"
#include "filters.h"
#include "formats.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, csp, range, alpha, pts)
#define	CHECK_AUDIO_PARAM_CHANGE(s, c, srate, layout, format, pts)
#define	OFFSET(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.
int	av_buffersrc_parameters_set (AVFilterContext *ctx, AVBufferSrcParameters *param)
	Initialize the buffersrc or abuffersrc filter with the provided parameters.
int attribute_align_arg	av_buffersrc_write_frame (AVFilterContext *ctx, const AVFrame *frame)
	Add a frame to the buffer source.
int attribute_align_arg	av_buffersrc_add_frame (AVFilterContext *ctx, AVFrame *frame)
	Add a frame to the buffer source.
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.
int	av_buffersrc_close (AVFilterContext *ctx, int64_t pts, unsigned flags)
	Close the buffer source after EOF.
int	av_buffersrc_get_status (AVFilterContext *ctx)
	Returns 0 or a negative AVERROR code.
static av_cold int	common_init (AVFilterContext *ctx)
static av_cold int	init_video (AVFilterContext *ctx)
unsigned	av_buffersrc_get_nb_failed_requests (AVFilterContext *buffer_src)
	Get the number of failed requests.
	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 (const AVFilterContext *ctx, AVFilterFormatsConfig **cfg_in, AVFilterFormatsConfig **cfg_out)
static int	config_props (AVFilterLink *link)
static int	activate (AVFilterContext *ctx)

Variables
static const AVOption	buffer_options []
static const AVOption	abuffer_options []
static const AVFilterPad	avfilter_vsrc_buffer_outputs []
const FFFilter	ff_vsrc_buffer
static const AVFilterPad	avfilter_asrc_abuffer_outputs []
const FFFilter	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,
			csp,
			range,
			alpha,
			pts )

Value:

    c->link_delta = c->w != width || c->h != height || c->pix_fmt != format ||\
                    c->color_space != csp || c->color_range != range || c->alpha_mode != alpha;\
    c->prev_delta = c->prev_w != width || c->prev_h != height || c->prev_pix_fmt != format ||\
                    c->prev_color_space != csp || c->prev_color_range != range || c->prev_alpha_mode != alpha;\
    if (c->link_delta) {\
        int loglevel = c->prev_delta ? AV_LOG_WARNING : AV_LOG_DEBUG;\
        av_log(s, loglevel, "Changing video frame properties on the fly is not supported by all filters.\n");\
        av_log(s, loglevel, "filter context - w: %d h: %d fmt: %d csp: %s range: %s alpha: %s, incoming frame - w: %d h: %d fmt: %d csp: %s range: %s alpha: %s pts_time: %s\n",\
               c->w, c->h, c->pix_fmt, av_color_space_name(c->color_space), av_color_range_name(c->color_range), av_alpha_mode_name(c->alpha_mode),\
               width, height, format, av_color_space_name(csp), av_color_range_name(range), av_alpha_mode_name(alpha),\
               av_ts2timestr(pts, &s->outputs[0]->time_base));\
    }\
    if (c->prev_delta) {\
        if (!c->link_delta)\
            av_log(s, AV_LOG_VERBOSE, "video frame properties congruent with link at pts_time: %s\n", av_ts2timestr(pts, &s->outputs[0]->time_base));\
        c->prev_w = width;\
        c->prev_h = height;\
        c->prev_pix_fmt = format;\
        c->prev_color_space = csp;\
        c->prev_color_range = range;\
        c->prev_alpha_mode = alpha;\
    }

Definition at line 74 of file buffersrc.c.

Referenced by av_buffersrc_add_frame_flags().

CHECK_AUDIO_PARAM_CHANGE

#define CHECK_AUDIO_PARAM_CHANGE	(		s,
			c,
			srate,
			layout,
			format,
			pts )

Value:

    if (c->sample_fmt != format || c->sample_rate != srate ||\
        av_channel_layout_compare(&c->ch_layout, &layout) || c->channels != layout.nb_channels) {\
        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->ch_layout.order == AV_CHANNEL_ORDER_NATIVE ? c->ch_layout.u.mask : 0, c->channels,\
               av_get_sample_fmt_name(format), srate, layout.order == AV_CHANNEL_ORDER_NATIVE ? layout.u.mask : 0, layout.nb_channels, 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 98 of file buffersrc.c.

Referenced by av_buffersrc_add_frame_flags().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(BufferSourceContext, x)

Definition at line 357 of file buffersrc.c.

A

#define A   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_AUDIO_PARAM

Definition at line 358 of file buffersrc.c.

V

#define V   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 359 of file buffersrc.c.

Function Documentation

push_frame()

static int push_frame ( AVFilterGraph * graph )

static

Definition at line 196 of file buffersrc.c.

Referenced by av_buffersrc_add_frame_flags(), and av_buffersrc_close().

common_init()

static av_cold int common_init ( AVFilterContext * ctx )

static

Definition at line 310 of file buffersrc.c.

Referenced by init_audio(), and init_video().

init_video()

static av_cold int init_video ( AVFilterContext * ctx )

static

Definition at line 318 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 418 of file buffersrc.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 468 of file buffersrc.c.

query_formats()

static int query_formats ( const AVFilterContext * ctx, AVFilterFormatsConfig ** cfg_in, AVFilterFormatsConfig ** cfg_out )

static

Definition at line 476 of file buffersrc.c.

config_props()

static int config_props ( AVFilterLink * link )

static

Definition at line 549 of file buffersrc.c.

activate()

static int activate ( AVFilterContext * ctx )

static

Definition at line 593 of file buffersrc.c.

Variable Documentation

buffer_options

const AVOption buffer_options[]

static

Definition at line 361 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(ch_layout),           AV_OPT_TYPE_CHLAYOUT,           .flags = A },
    { "channels",       NULL, OFFSET(channels),            AV_OPT_TYPE_INT,      { .i64 = 0 }, 0, INT_MAX, A },
    { NULL },
}

Definition at line 407 of file buffersrc.c.

avfilter_vsrc_buffer_outputs

const AVFilterPad avfilter_vsrc_buffer_outputs[]

static

Initial value:

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

Definition at line 611 of file buffersrc.c.

ff_vsrc_buffer

const FFFilter ff_vsrc_buffer

Initial value:

= {
    .p.name        = "buffer",
    .p.description = NULL_IF_CONFIG_SMALL("Buffer video frames, and make them accessible to the filterchain."),
    .p.priv_class  = &buffer_class,
    .priv_size = sizeof(BufferSourceContext),
    .activate  = activate,
    .init      = init_video,
    .uninit    = uninit,
 
    FILTER_OUTPUTS(avfilter_vsrc_buffer_outputs),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 619 of file buffersrc.c.

avfilter_asrc_abuffer_outputs

const AVFilterPad avfilter_asrc_abuffer_outputs[]

static

Initial value:

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

Definition at line 632 of file buffersrc.c.

ff_asrc_abuffer

const FFFilter ff_asrc_abuffer

Initial value:

= {
    .p.name        = "abuffer",
    .p.description = NULL_IF_CONFIG_SMALL("Buffer audio frames, and make them accessible to the filterchain."),
    .p.priv_class  = &abuffer_class,
    .priv_size     = sizeof(BufferSourceContext),
    .activate  = activate,
    .init      = init_audio,
    .uninit    = uninit,
 
    FILTER_OUTPUTS(avfilter_asrc_abuffer_outputs),
    FILTER_QUERY_FUNC2(query_formats),
}

Definition at line 640 of file buffersrc.c.