Audio Namespace Reference

Classes dealing with audio output drivers and decoding/playing audio files. More...

Classes
struct	AudioFormat
	Audio format, somewhat ripped off from libao. More...
class	AudioException
	Exception for audio output problems. More...
class	Initializer
	Initialize the audio output libraries; uninitialize on destruction. More...
class	Output
	Base audio output class (abstract). More...
class	AvDeviceOutput
	Output class for libavdevice. More...
struct	FrameDeleter
struct	PacketDeleter
class	LavAudioException
	Exception for ffmpeg audio output problems. More...
class	LavAdapter
	Adapter to feed a ffmpeg stream to an audio output. More...
class	LavGenericAdapter
	Adapter to feed a ffmpeg stream to a generic audio output. More...
class	LibavMediaReader
	Base class for reading media streams via ffmpeg. More...
class	LavPlayer
	ffmpeg audio player More...
class	GstreamerAudioException
	Exception for gstreamer audio output problems. More...
class	GstreamerSimplePipeline
	Base class for gstreamer pipelines. More...
class	GstreamerDoublePipeline
	Class for gstreamer pipelines that need sources wired to downstream elements dynamically when autoplugging. More...
class	GstreamerMediaReader
	Class for reading media streams via gstreamer. More...
class	GstreamerReaderWithBus
	Base class for gstreamer pipelines, both readers and outputs. More...
class	GstreamerPlayer
	Play media or a stream using gstreamer. More...
class	GstreamerOutput
	Audio output class utilizing gstreamer for output. More...
class	LibaoOutput
	Audio output class utilizing libao for output. More...
class	LibsdlOutput
	Audio output class utilizing SDL for output. More...
class	AVFoundationPlayer
	Base class for OS X's AVFoundation audio player. More...

Enumerations
enum	SampleArrangement { Native , Big , Little }
enum	SampleSignedness { Signed , Unsigned }

Functions
static const AVOutputFormat *	findDevice (const AudioSettings &settings)
	Find the audio output device. More...
void	flogav (const char *func, int err)
	Log an ffmpeg error. More...
static void	audio_fetch_callback (void *context, uint8_t *buffer, int length)
	The audio function callback takes the following parameters: buffer: A pointer to the audio buffer to be filled length: The length (in bytes) of the audio buffer. More...
Media::Player *	getAVFoundationPlayer (const AudioSettings &AudioSettings, const std::string &media_url, float initial_audio_gain)
	Old-style C interface to provide bridge from C++ to Objective-C compiled code. More...

Variables
union {
unsigned char   Audio::bytes [4]
uint32_t   Audio::value
}	B4_host_order = { { 0, 1, 2, 3 } }
	Constants to determine byte ordering on-the-fly. More...
union {
unsigned char   Audio::bytes [2]
uint16_t   Audio::value
}	B2_host_order = { { 0, 1 } }
	Constants to determine byte ordering of 2-byte values. More...

Detailed Description

Classes dealing with audio output drivers and decoding/playing audio files.

Enumeration Type Documentation

SampleArrangement

enum Audio::SampleArrangement

Enumerator
Native
Big
Little

SampleSignedness

enum Audio::SampleSignedness

Enumerator
Signed
Unsigned

Function Documentation

audio_fetch_callback()

static void Audio::audio_fetch_callback ( void *  context, uint8_t *  buffer, int  length  )

static

The audio function callback takes the following parameters: buffer: A pointer to the audio buffer to be filled length: The length (in bytes) of the audio buffer.

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findDevice()

static const AVOutputFormat* Audio::findDevice ( const AudioSettings &  settings )

static

Find the audio output device.

If a driver is specified in the settings, use that. Otherwise, use the first device found.

Parameters

settings

The audio settings to match.

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flogav()

void Audio::flogav	(	const char *	func,
		int	err
	)

Log an ffmpeg error.

Parameters

func	The function name causing the error.
err	The ffmpeg error number.

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getAVFoundationPlayer()

Media::Player * Audio::getAVFoundationPlayer	(	const AudioSettings &	AudioSettings,
		const std::string &	media_url,
		float	initial_audio_gain
	)

Old-style C interface to provide bridge from C++ to Objective-C compiled code.

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Variable Documentation

const { ... } Audio::B2_host_order

Constants to determine byte ordering of 2-byte values.

const { ... } Audio::B4_host_order

Constants to determine byte ordering on-the-fly.

Credit to Cristoph

See also

http://stackoverflow.com/questions/2100331/c-macro-definition-to-determine-big-endian-or-little-endian-machine

bytes

unsigned char Audio::bytes[2]

value

uint16_t Audio::value