FFmpeg
Data Structures | Macros | Functions | Variables
buffersrc.c File Reference
#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 351 of file buffersrc.c.

◆ query_formats()

static int query_formats ( AVFilterContext *  ctx)
static

Definition at line 357 of file buffersrc.c.

◆ config_props()

static int config_props ( AVFilterLink *  link)
static

Definition at line 392 of file buffersrc.c.

◆ request_frame()

static int request_frame ( AVFilterLink *  link)
static

Definition at line 421 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 431 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 441 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 455 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 465 of file buffersrc.c.

AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:200
init
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:31
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
AV_OPT_TYPE_SAMPLE_FMT
@ AV_OPT_TYPE_SAMPLE_FMT
Definition: opt.h:237
A
#define A
Definition: buffersrc.c:271
w
uint8_t w
Definition: llviddspenc.c:39
OFFSET
#define OFFSET(x)
Definition: buffersrc.c:270
AV_OPT_TYPE_RATIONAL
@ AV_OPT_TYPE_RATIONAL
Definition: opt.h:230
sample_rate
sample_rate
Definition: ffmpeg_filter.c:170
uninit
static av_cold void uninit(AVFilterContext *ctx)
Definition: buffersrc.c:351
pts
static int64_t pts
Definition: transcode_aac.c:652
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:194
width
#define width
s
#define s(width, name)
Definition: cbs_vp9.c:257
format
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample format(the sample packing is implied by the sample format) and sample rate. The lists are not just lists
AVMEDIA_TYPE_AUDIO
@ AVMEDIA_TYPE_AUDIO
Definition: avutil.h:202
BufferSourceContext
Definition: buffersrc.c:44
avfilter_vsrc_buffer_outputs
static const AVFilterPad avfilter_vsrc_buffer_outputs[]
Definition: buffersrc.c:431
outputs
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
channels
channels
Definition: aptx.h:33
pix_fmt
static enum AVPixelFormat pix_fmt
Definition: demuxing_decoding.c:40
av_get_sample_fmt_name
const char * av_get_sample_fmt_name(enum AVSampleFormat sample_fmt)
Return the name of sample_fmt, or NULL if sample_fmt is not recognized.
Definition: samplefmt.c:49
NULL
#define NULL
Definition: coverity.c:32
AV_OPT_TYPE_IMAGE_SIZE
@ AV_OPT_TYPE_IMAGE_SIZE
offset must point to two consecutive integers
Definition: opt.h:235
inputs
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several inputs
Definition: filter_design.txt:243
c
Undefined Behavior In the C some operations are like signed integer dereferencing freed accessing outside allocated Undefined Behavior must not occur in a C it is not safe even if the output of undefined operations is unused The unsafety may seem nit picking but Optimizing compilers have in fact optimized code on the assumption that no undefined Behavior occurs Optimizing code based on wrong assumptions can and has in some cases lead to effects beyond the output of computations The signed integer overflow problem in speed critical code Code which is highly optimized and works with signed integers sometimes has the problem that often the output of the computation does not c
Definition: undefined.txt:32
V
#define V
Definition: buffersrc.c:272
av_ts2timestr
#define av_ts2timestr(ts, tb)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: timestamp.h:76
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification.
Definition: internal.h:117
config_props
static int config_props(AVFilterLink *link)
Definition: buffersrc.c:392
AV_SAMPLE_FMT_NONE
@ AV_SAMPLE_FMT_NONE
Definition: samplefmt.h:59
height
#define height
request_frame
static int request_frame(AVFilterLink *link)
Definition: buffersrc.c:421
init_audio
static av_cold int init_audio(AVFilterContext *ctx)
Definition: buffersrc.c:302
AV_LOG_INFO
#define AV_LOG_INFO
Standard information.
Definition: log.h:205
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: buffersrc.c:357
init_video
static av_cold int init_video(AVFilterContext *ctx)
Definition: buffersrc.c:242
AV_PIX_FMT_NONE
@ AV_PIX_FMT_NONE
Definition: pixfmt.h:65
AV_OPT_TYPE_INT
@ AV_OPT_TYPE_INT
Definition: opt.h:225
AV_OPT_TYPE_PIXEL_FMT
@ AV_OPT_TYPE_PIXEL_FMT
Definition: opt.h:236
AVMEDIA_TYPE_VIDEO
@ AVMEDIA_TYPE_VIDEO
Definition: avutil.h:201
h
h
Definition: vp9dsp_template.c:2038
AV_OPT_TYPE_STRING
@ AV_OPT_TYPE_STRING
Definition: opt.h:229
avfilter_asrc_abuffer_outputs
static const AVFilterPad avfilter_asrc_abuffer_outputs[]
Definition: buffersrc.c:455
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