FFmpeg
Data Structures | Macros | 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"

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, unref_fn, get_fmt, none, desc)
 

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 ff_af_aformat
 

Detailed Description

format audio filter

Definition in file af_aformat.c.

Macro Definition Documentation

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

Definition at line 48 of file af_aformat.c.

#define A   AV_OPT_FLAG_AUDIO_PARAM

Definition at line 49 of file af_aformat.c.

Definition at line 50 of file af_aformat.c.

#define PARSE_FORMATS (   str,
  type,
  list,
  add_to_list,
  unref_fn,
  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) { \
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); \
} \
if ((ret = add_to_list(&list, fmt)) < 0) { \
unref_fn(&list); \
} \
\
cur = next; \
} \
} while (0)
const char * fmt
Definition: avisynth_c.h:861
#define AV_LOG_WARNING
Something somehow does not look correct.
Definition: log.h:182
const char * desc
Definition: nvenc.c:68
GLint GLenum type
Definition: opengl_enc.c:104
#define av_log(a,...)
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVFormatContext * ctx
Definition: movenc.c:48
if(ret)
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 list
int
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 For filters that do not use the this method is called when a frame is wanted on an output For a 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 or at least make progress towards producing a it should return
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

Definition at line 60 of file af_aformat.c.

Referenced by init().

Function Documentation

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

Definition at line 91 of file af_aformat.c.

Referenced by init().

static av_cold int init ( AVFilterContext ctx)
static

Definition at line 97 of file af_aformat.c.

static int query_formats ( AVFilterContext ctx)
static

Definition at line 112 of file af_aformat.c.

Variable Documentation

const AVOption aformat_options[]
static
Initial value:
= {
{ "sample_fmts", "A '|'-separated list of sample formats.", OFFSET(formats_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "sample_rates", "A '|'-separated list of sample rates.", OFFSET(sample_rates_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ "channel_layouts", "A '|'-separated list of channel layouts.", OFFSET(channel_layouts_str), AV_OPT_TYPE_STRING, .flags = A|F },
{ NULL }
}
#define NULL
Definition: coverity.c:32
#define F
Definition: af_aformat.c:50
#define A
Definition: af_aformat.c:49
#define OFFSET(x)
Definition: af_aformat.c:48

Definition at line 51 of file af_aformat.c.

const AVFilterPad avfilter_af_aformat_inputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}
#define NULL
Definition: coverity.c:32

Definition at line 129 of file af_aformat.c.

const AVFilterPad avfilter_af_aformat_outputs[]
static
Initial value:
= {
{
.name = "default",
},
{ NULL }
}
#define NULL
Definition: coverity.c:32

Definition at line 137 of file af_aformat.c.

AVFilter ff_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,
}
static const AVFilterPad avfilter_af_aformat_inputs[]
Definition: af_aformat.c:129
static int query_formats(AVFilterContext *ctx)
Definition: af_aformat.c:112
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
static av_cold int init(AVFilterContext *ctx)
Definition: af_aformat.c:97
static const AVFilterPad outputs[]
Definition: af_acontrast.c:203
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
static const AVFilterPad avfilter_af_aformat_outputs[]
Definition: af_aformat.c:137

Definition at line 145 of file af_aformat.c.