Audio Module

Audio Interface. More...

Classes
class	cAlsaDevice
	Alsa Interface. More...
class	cAudioStream
	Audio Interface. More...
class	cAudioProcessor
	Audio Manipulation. More...
class	cPidController
	PID Controller. More...
class	cRingbuffer
	Ringbuffer (FIFO) Implementation. More...

Functions
static void	AlsaNoopCallback (__attribute__((unused)) const char *file, __attribute__((unused)) int line, __attribute__((unused)) const char *function, __attribute__((unused)) int err, __attribute__((unused)) const char *fmt,...)
	Empty log callback.
static const char *	alsaToFFmpegChannel (const char *alsaName)
	FFmpeg does not have channels called "RL" or "RR" So "rename" Alsas RL (rear left) and RR (rear right) to FFmpegs BL (back left) and BR (back right) to make the channelmap filter parser happy.
static std::vector< std::string >	GetFFmpegChannelLayoutAsArray (const AVChannelLayout &layout)
	Put FFmpeg channel layout in a dynamic array of strings.
static bool	LayoutsMatch (const std::vector< std::string > &ff, const std::vector< std::string > &alsa)
	Check, if FFmpeg and Alsa channel layout match.
static bool	LayoutIsValid (const std::vector< std::string > &channelLayout)
	Check, if the channel layout has channels named "NA" (N/A, silent)
std::vector< std::string >	cAlsaDevice::GetChannelLayoutAsArray (void)
	Put ALSA channel layout in a dynamic array of strings.
std::string	cAudioStream::BuildChannelMapFilter (const AVChannelLayout &)
	Build the "|"-separated mappings list for the channelmap filter.

Detailed Description

Audio Interface.

Handles the audio stream

Function Documentation

AlsaNoopCallback()

static void AlsaNoopCallback ( __attribute__((unused)) const char *  file, __attribute__((unused)) int  line, __attribute__((unused)) const char *  function, __attribute__((unused)) int  err, __attribute__((unused)) const char *  fmt,   ...  )

static

Empty log callback.

Definition at line 30 of file alsadevice.cpp.

Referenced by cAlsaDevice::Init().

alsaToFFmpegChannel()

static const char * alsaToFFmpegChannel ( const char *  alsaName )

static

FFmpeg does not have channels called "RL" or "RR" So "rename" Alsas RL (rear left) and RR (rear right) to FFmpegs BL (back left) and BR (back right) to make the channelmap filter parser happy.

Definition at line 605 of file alsadevice.cpp.

Referenced by cAlsaDevice::GetChannelLayoutAsArray().

BuildChannelMapFilter()

std::string cAudioStream::BuildChannelMapFilter ( const AVChannelLayout &  layout )

private

Build the "|"-separated mappings list for the channelmap filter.

Parameters

layout

current FFmpeg channel layout

Returns

mapping string to feed into the channelmap filter

Definition at line 141 of file audio.cpp.

References cAlsaDevice::GetChannelLayoutAsArray(), GetFFmpegChannelLayoutAsArray(), L_SOUND, LayoutIsValid(), LayoutsMatch(), LOGDEBUG2, LOGWARNING, and cAudioStream::m_alsa.

Referenced by cAudioStream::InitFilter().

GetChannelLayoutAsArray()

std::vector< std::string > cAlsaDevice::GetChannelLayoutAsArray

(

void

)

Put ALSA channel layout in a dynamic array of strings.

Parameters

pcmHandle

current Alsa PCM handle

Returns

ALSA channel layout as an array of strings

Definition at line 622 of file alsadevice.cpp.

References alsaToFFmpegChannel(), and cAlsaDevice::m_pPCMHandle.

Referenced by cAudioStream::BuildChannelMapFilter(), and cAlsaDevice::Setup().

GetFFmpegChannelLayoutAsArray()

static std::vector< std::string > GetFFmpegChannelLayoutAsArray ( const AVChannelLayout &  layout )

static

Put FFmpeg channel layout in a dynamic array of strings.

Parameters

layout

current FFmpeg channel layout

Returns

ffmpeg layout as an array of strings

Definition at line 80 of file audio.cpp.

Referenced by cAudioStream::BuildChannelMapFilter().

LayoutIsValid()

static bool LayoutIsValid ( const std::vector< std::string > &  channelLayout )

static

Check, if the channel layout has channels named "NA" (N/A, silent)

Parameters

channelLayout

channel layout

Returns

true if the channel layout doesn't contain "NA" (N/A, silent)

Definition at line 127 of file audio.cpp.

Referenced by cAudioStream::BuildChannelMapFilter().

LayoutsMatch()

static bool LayoutsMatch ( const std::vector< std::string > &  ff, const std::vector< std::string > &  alsa  )

static

Check, if FFmpeg and Alsa channel layout match.

Parameters

ff	Array of FFmpeg channel layout
alsa	Array of Alsa channel layout

Returns

true if the channel layouts match

Definition at line 105 of file audio.cpp.

Referenced by cAudioStream::BuildChannelMapFilter().