Libav
Data Structures | Macros | Functions | Variables
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

AVBufferSrcParametersav_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 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

◆ 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_ERROR, "Changing frame properties on the fly is not supported.\n");\
return AVERROR(EINVAL);\
}
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#define AVERROR(e)
Definition: error.h:43
static int width
Definition: utils.c:156
const char * format
Definition: movenc.c:47
int height
Definition: gxfenc.c:72

Definition at line 68 of file buffersrc.c.

Referenced by av_buffersrc_add_frame().

◆ CHECK_AUDIO_PARAM_CHANGE

#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);\
}
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:124
#define AVERROR(e)
Definition: error.h:43
const char * format
Definition: movenc.c:47

Definition at line 74 of file buffersrc.c.

Referenced by av_buffersrc_add_frame().

◆ OFFSET

#define OFFSET (   x)    offsetof(BufferSourceContext, x)

Definition at line 239 of file buffersrc.c.

◆ A

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 240 of file buffersrc.c.

◆ V

#define V   AV_OPT_FLAG_VIDEO_PARAM

Definition at line 241 of file buffersrc.c.

Function Documentation

◆ init_video()

static av_cold int init_video ( AVFilterContext ctx)
static

Definition at line 208 of file buffersrc.c.

◆ init_audio()

static av_cold int init_audio ( AVFilterContext ctx)
static

Definition at line 283 of file buffersrc.c.

◆ uninit()

static av_cold void uninit ( AVFilterContext ctx)
static

Definition at line 323 of file buffersrc.c.

◆ query_formats()

static int query_formats ( AVFilterContext ctx)
static

Definition at line 336 of file buffersrc.c.

◆ config_props()

static int config_props ( AVFilterLink link)
static

Definition at line 365 of file buffersrc.c.

◆ request_frame()

static int request_frame ( AVFilterLink link)
static

Definition at line 394 of file buffersrc.c.

◆ poll_frame()

static int poll_frame ( AVFilterLink link)
static

Definition at line 412 of file buffersrc.c.

Variable Documentation

◆ video_options

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 },
{ "time_base_num", "deprecated, do not use", OFFSET(time_base.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "time_base_den", "deprecated, do not use", OFFSET(time_base.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "sar_num", "deprecated, do not use", OFFSET(pixel_aspect.num), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "sar_den", "deprecated, do not use", OFFSET(pixel_aspect.den), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, V },
{ "sar", "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 },
{ NULL },
}
int num
numerator
Definition: rational.h:44
static const AVRational pixel_aspect[17]
Definition: h264_ps.c:43
#define OFFSET(x)
Definition: buffersrc.c:239
NULL
Definition: eval.c:55
#define V
Definition: buffersrc.c:241
int den
denominator
Definition: rational.h:45

Definition at line 243 of file buffersrc.c.

◆ buffer_class

const AVClass buffer_class
static
Initial value:
= {
.class_name = "buffer source",
.item_name = av_default_item_name,
.option = video_options,
}
static const AVOption video_options[]
Definition: buffersrc.c:243
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
av_default_item_name
Definition: dnxhdenc.c:55

Definition at line 261 of file buffersrc.c.

◆ audio_options

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 },
}
#define OFFSET(x)
Definition: buffersrc.c:239
#define A
Definition: buffersrc.c:240
NULL
Definition: eval.c:55

Definition at line 268 of file buffersrc.c.

◆ abuffer_class

const AVClass abuffer_class
static
Initial value:
= {
.class_name = "abuffer source",
.item_name = av_default_item_name,
.option = audio_options,
}
LIBAVUTIL_VERSION_INT
Definition: eval.c:55
av_default_item_name
Definition: dnxhdenc.c:55
static const AVOption audio_options[]
Definition: buffersrc.c:268

Definition at line 276 of file buffersrc.c.

◆ avfilter_vsrc_buffer_outputs

const AVFilterPad avfilter_vsrc_buffer_outputs[]
static
Initial value:
= {
{
.name = "default",
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props,
},
{ NULL }
}
static int poll_frame(AVFilterLink *link)
Definition: buffersrc.c:412
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:394
NULL
Definition: eval.c:55
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:365

Definition at line 421 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),
.priv_class = &buffer_class,
}
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:259
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:208
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:421
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:323
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
NULL
Definition: eval.c:55
static const AVClass buffer_class
Definition: buffersrc.c:261
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:248
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:336

Definition at line 432 of file buffersrc.c.

◆ avfilter_asrc_abuffer_outputs

const AVFilterPad avfilter_asrc_abuffer_outputs[]
static
Initial value:
= {
{
.name = "default",
.request_frame = request_frame,
.poll_frame = poll_frame,
.config_props = config_props,
},
{ NULL }
}
static int poll_frame(AVFilterLink *link)
Definition: buffersrc.c:412
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:394
NULL
Definition: eval.c:55
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:365

Definition at line 446 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),
.priv_class = &abuffer_class,
}
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:259
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:323
static const AVClass abuffer_class
Definition: buffersrc.c:276
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:446
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:148
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:283
NULL
Definition: eval.c:55
static const AVFilterPad inputs[]
Definition: af_ashowinfo.c:248
static av_cold int init(AVCodecParserContext *s)
Definition: h264_parser.c:582
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:336

Definition at line 457 of file buffersrc.c.