Data Structures | Macros | Typedefs | Functions | Variables
af_aformat.c File Reference

format audio filter More...

#include "libavutil/avstring.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.h"
#include "libavutil/opt.h"
#include "audio.h"
#include "avfilter.h"
#include "formats.h"
#include "internal.h"
Include dependency graph for af_aformat.c:

Go to the source code of this file.

Data Structures

struct  AFormatContext
 

Macros

#define OFFSET(x)   offsetof(AFormatContext, x)
 
#define A   AV_OPT_FLAG_AUDIO_PARAM
 
#define F   AV_OPT_FLAG_FILTERING_PARAM
 
#define PARSE_FORMATS(str, type, list, add_to_list, get_fmt, none, desc)
 

Typedefs

typedef struct AFormatContext AFormatContext
 

Functions

 AVFILTER_DEFINE_CLASS (aformat)
 
static int get_sample_rate (const char *samplerate)
 
static av_cold int init (AVFilterContext *ctx)
 
static int query_formats (AVFilterContext *ctx)
 

Variables

static const AVOption aformat_options []
 
static const AVFilterPad avfilter_af_aformat_inputs []
 
static const AVFilterPad avfilter_af_aformat_outputs []
 
AVFilter avfilter_af_aformat
 

Detailed Description

format audio filter

Definition in file af_aformat.c.

Macro Definition Documentation

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 49 of file af_aformat.c.

#define F   AV_OPT_FLAG_FILTERING_PARAM

Definition at line 50 of file af_aformat.c.

Referenced by idct().

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

Definition at line 48 of file af_aformat.c.

#define PARSE_FORMATS (   str,
  type,
  list,
  add_to_list,
  get_fmt,
  none,
  desc 
)
Value:
do { \
char *next, *cur = str, sep; \
\
if (str && strchr(str, ',')) { \
av_log(ctx, AV_LOG_WARNING, "This syntax is deprecated, use '|' to "\
"separate %s.\n", desc); \
sep = ','; \
} else \
sep = '|'; \
\
while (cur) { \
type fmt; \
next = strchr(cur, sep); \
if (next) \
*next++ = 0; \
\
if ((fmt = get_fmt(cur)) == none) { \
av_log(ctx, AV_LOG_ERROR, "Error parsing " desc ": %s.\n", cur);\
return AVERROR(EINVAL); \
} \
add_to_list(&list, fmt); \
\
cur = next; \
} \
} while (0)
fmt
const char * fmt
Definition: avisynth_c.h:669
AV_LOG_WARNING
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:154
list
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer 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 list
Definition: filter_design.txt:23
if
initialize output if(nPeaks >3)%at least 3 peaks in spectrum for trying to find f0 nf0peaks
av_log
void av_log(void *avcl, int level, const char *fmt,...)
Definition: log.c:246
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:148
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFilterBuffer 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.Buffer references ownership and permissions
type
#define type
while
Synth Windw Norm while(pin< pend)%Until the end...%---Analysis x_w
return
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 the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame This method is called when a frame is wanted on an output For an it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return it should return
Definition: filter_design.txt:216

Definition at line 60 of file af_aformat.c.

Referenced by init().

Typedef Documentation

typedef struct AFormatContext AFormatContext

Function Documentation

AVFILTER_DEFINE_CLASS ( aformat  )
static int get_sample_rate ( const char *  samplerate)
static

Definition at line 87 of file af_aformat.c.

Referenced by init().

static av_cold int init ( AVFilterContext *  ctx)
static

Definition at line 93 of file af_aformat.c.

static int query_formats ( AVFilterContext *  ctx)
static

Definition at line 108 of file af_aformat.c.

Variable Documentation

const AVOption aformat_options[]
static
Initial value:
= {
{ "sample_fmts", "A comma-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "sample_rates", "A comma-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "channel_layouts", "A comma-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ NULL },
}
AV_OPT_TYPE_STRING
Definition: opt.h:226
F
#define F
Definition: af_aformat.c:50
A
#define A
Definition: af_aformat.c:49
OFFSET
#define OFFSET(x)
Definition: af_aformat.c:48
NULL
NULL
Definition: eval.c:55

Definition at line 51 of file af_aformat.c.

AVFilter avfilter_af_aformat
Initial value:
= {
.name = "aformat",
.description = NULL_IF_CONFIG_SMALL("Convert the input audio to one of the specified formats."),
.init = init,
.query_formats = query_formats,
.priv_size = sizeof(AFormatContext),
.priv_class = &aformat_class,
.inputs = avfilter_af_aformat_inputs,
.outputs = avfilter_af_aformat_outputs,
}
outputs
static const AVFilterPad outputs[]
Definition: af_ashowinfo.c:117
avfilter_af_aformat_inputs
static const AVFilterPad avfilter_af_aformat_inputs[]
Definition: af_aformat.c:122
AFormatContext
struct AFormatContext AFormatContext
query_formats
static int query_formats(AVFilterContext *ctx)
Definition: af_aformat.c:108
NULL_IF_CONFIG_SMALL
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: libavutil/internal.h:123
init
static av_cold int init(AVFilterContext *ctx)
Definition: af_aformat.c:93
avfilter_af_aformat_outputs
static const AVFilterPad avfilter_af_aformat_outputs[]
Definition: af_aformat.c:130
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:216

Definition at line 138 of file af_aformat.c.

const AVFilterPad avfilter_af_aformat_inputs[]
static
Initial value:
= {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
},
{ NULL }
}
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:144
NULL
NULL
Definition: eval.c:55

Definition at line 122 of file af_aformat.c.

const AVFilterPad avfilter_af_aformat_outputs[]
static
Initial value:
= {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO
},
{ NULL }
}
AVMEDIA_TYPE_AUDIO
Definition: avutil.h:144
NULL
NULL
Definition: eval.c:55

Definition at line 130 of file af_aformat.c.

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