FFmpeg
Macros | Functions
oss.c File Reference
#include "config.h"
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#include "libavutil/file_open.h"
#include "libavutil/log.h"
#include "avdevice.h"
#include "oss.h"

Go to the source code of this file.

Macros

#define CHECK_IOCTL_ERROR(event)
 

Functions

int ff_oss_audio_open (AVFormatContext *s1, int is_output, const char *audio_device)
 
int ff_oss_audio_close (OSSAudioData *s)
 

Macro Definition Documentation

◆ CHECK_IOCTL_ERROR

#define CHECK_IOCTL_ERROR (   event)
Value:
if (err < 0) { \
av_log(s1, AV_LOG_ERROR, #event ": %s\n", av_err2str(AVERROR(errno)));\
goto fail; \
}

Function Documentation

◆ ff_oss_audio_open()

int ff_oss_audio_open ( AVFormatContext *  s1,
int  is_output,
const char *  audio_device 
)

Definition at line 40 of file oss.c.

Referenced by audio_read_header(), and audio_write_header().

◆ ff_oss_audio_close()

int ff_oss_audio_close ( OSSAudioData *  s)

Definition at line 137 of file oss.c.

Referenced by audio_read_close(), and audio_write_trailer().

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
fail
#define fail()
Definition: checkasm.h:189
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:209
av_err2str
#define av_err2str(errnum)
Convenience macro, the return value should be used only directly in function arguments but never stan...
Definition: error.h:122
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