All toFloat variants require 16 byte aligned input and output buffers on x86 for SSE optimised operation The SSE code processes 16 bytes at a time and leaves any remainder for the C. More...

#include <libmyth/audio/audiooutpututil.h>

Static Public Member Functions
static bool	has_optimized_SIMD ()
	Returns true if the processor supports MythTV's optimized SIMD for AudioOutputUtil/AudioConvert. More...

static void	AdjustVolume (void *buffer, int len, int volume, bool music, bool upmix)
	Adjust the volume of samples. More...

static void	MuteChannel (int obits, int channels, int ch, void *buffer, int bytes)
	Mute individual channels through mono->stereo duplication. More...

static char *	GeneratePinkFrames (char *frames, int channels, int channel, int count, int bits=16)

static int	DecodeAudio (AVCodecContext ctx, uint8_t buffer, int &data_size, const AVPacket *pkt)
	DecodeAudio Decode an audio packet, and compact it if data is planar Return negative error code if an error occurred during decoding or the number of bytes consumed from the input AVPacket data_size contains the size of decoded data copied into buffer. More...

static int	toFloat (AudioFormat format, void out, const void in, int bytes)
	Convert integer samples to floats. More...

static int	fromFloat (AudioFormat format, void out, const void in, int bytes)
	Convert float samples to integers. More...

static void	MonoToStereo (void dst, const void src, int samples)
	Convert a mono stream to stereo by copying and interleaving samples. More...

static void	DeinterleaveSamples (AudioFormat format, int channels, uint8_t output, const uint8_t input, int data_size)
	Deinterleave input samples Deinterleave audio samples and compact them. More...

static void	InterleaveSamples (AudioFormat format, int channels, uint8_t output, const uint8_t const *input, int data_size)
	Interleave input samples Planar audio is contained in array of pointers Interleave audio samples (convert from planar format) More...

static void	InterleaveSamples (AudioFormat format, int channels, uint8_t output, const uint8_t input, int data_size)
	Interleave input samples Interleave audio samples (convert from planar format) More...

Detailed Description

All toFloat variants require 16 byte aligned input and output buffers on x86 for SSE optimised operation The SSE code processes 16 bytes at a time and leaves any remainder for the C.

there is no remainder in practice

Definition at line 12 of file audiooutpututil.h.

Member Function Documentation

◆ has_optimized_SIMD()

bool AudioOutputUtil::has_optimized_SIMD ( )

static

Returns true if the processor supports MythTV's optimized SIMD for AudioOutputUtil/AudioConvert.

Currently, only SSE2 is implemented.

Definition at line 52 of file audiooutpututil.cpp.

Referenced by AvFormatDecoder::DecoderWillDownmix().

◆ AdjustVolume()

void AudioOutputUtil::AdjustVolume	(	void *	buf,
		int	len,
		int	volume,
		bool	music,
		bool	upmix
	)

static

Adjust the volume of samples.

Makes a crude attempt to normalise the relative volumes of PCM from mythmusic, PCM from video and upmixed AC-3

Definition at line 97 of file audiooutpututil.cpp.

Referenced by AudioOutputBase::AddData().

◆ MuteChannel()

void AudioOutputUtil::MuteChannel	(	int	obits,
		int	channels,
		int	ch,
		void *	buffer,
		int	bytes
	)

static

Mute individual channels through mono->stereo duplication.

Mute given channel (left or right) by copying right or left channel over.

Definition at line 175 of file audiooutpututil.cpp.

Referenced by AudioOutputBase::GetAudioData().

◆ GeneratePinkFrames()

char * AudioOutputUtil::GeneratePinkFrames	(	char *	frames,
		int	channels,
		int	channel,
		int	count,
		int	bits = `16`
	)

static

Definition at line 188 of file audiooutpututil.cpp.

Referenced by AudioTestThread::run().

◆ DecodeAudio()

int AudioOutputUtil::DecodeAudio	(	AVCodecContext *	ctx,
		uint8_t *	buffer,
		int &	data_size,
		const AVPacket *	pkt
	)

static

DecodeAudio Decode an audio packet, and compact it if data is planar Return negative error code if an error occurred during decoding or the number of bytes consumed from the input AVPacket data_size contains the size of decoded data copied into buffer.

Definition at line 232 of file audiooutpututil.cpp.

Referenced by MythRAOPConnection::decodeAudioPacket().

◆ toFloat()

int AudioOutputUtil::toFloat	(	AudioFormat	format,
		void *	out,
		const void *	in,
		int	bytes
	)

static

Convert integer samples to floats.

Consumes 'bytes' bytes from in and returns the numer of bytes written to out

Definition at line 66 of file audiooutpututil.cpp.

Referenced by AudioOutputBase::AddData(), and MythAVFormatWriter::WriteAudioFrame().

◆ fromFloat()

int AudioOutputUtil::fromFloat	(	AudioFormat	format,
		void *	out,
		const void *	in,
		int	bytes
	)

static

Convert float samples to integers.

Consumes 'bytes' bytes from in and returns the numer of bytes written to out

Definition at line 77 of file audiooutpututil.cpp.

Referenced by AudioOutputDigitalEncoder::Encode(), and AudioOutputBase::GetAudioData().

◆ MonoToStereo()

void AudioOutputUtil::MonoToStereo	(	void *	dst,
		const void *	src,
		int	samples
	)

static

Convert a mono stream to stereo by copying and interleaving samples.

Definition at line 86 of file audiooutpututil.cpp.

Referenced by AudioOutputBase::CopyWithUpmix().

◆ DeinterleaveSamples()

void AudioOutputUtil::DeinterleaveSamples	(	AudioFormat	format,
		int	channels,
		uint8_t *	output,
		const uint8_t *	input,
		int	data_size
	)

static

Deinterleave input samples Deinterleave audio samples and compact them.

Definition at line 304 of file audiooutpututil.cpp.

Referenced by AudioOutputDigitalEncoder::Encode(), and MythAVFormatWriter::WriteAudioFrame().

◆ InterleaveSamples() [1/2]

void AudioOutputUtil::InterleaveSamples	(	AudioFormat	format,
		int	channels,
		uint8_t *	output,
		const uint8_t const	input,
		int	data_size
	)

static

Interleave input samples Planar audio is contained in array of pointers Interleave audio samples (convert from planar format)

Definition at line 316 of file audiooutpututil.cpp.

Referenced by DecodeAudio().

◆ InterleaveSamples() [2/2]

void AudioOutputUtil::InterleaveSamples	(	AudioFormat	format,
		int	channels,
		uint8_t *	output,
		const uint8_t *	input,
		int	data_size
	)

static

Interleave input samples Interleave audio samples (convert from planar format)

Definition at line 327 of file audiooutpututil.cpp.

The documentation for this class was generated from the following files:

mythtv/libs/libmyth/audio/audiooutpututil.h
mythtv/libs/libmyth/audio/audiooutpututil.cpp

Static Public Member Functions

Detailed Description

Member Function Documentation

◆ has_optimized_SIMD()

◆ AdjustVolume()

◆ MuteChannel()

◆ GeneratePinkFrames()

◆ DecodeAudio()

◆ toFloat()

◆ fromFloat()

◆ MonoToStereo()

◆ DeinterleaveSamples()

◆ InterleaveSamples() [1/2]

◆ InterleaveSamples() [2/2]