Audio Module

Audio and Alsa Interface. More...

Classes
class	cSoftHdAudio
	Audio Interface. More...
class	cPidController
	PID Controller. More...
class	cSoftHdRingbuffer
	Ringbuffer (FIFO) Implementation. More...

Macros
#define	atomic_set(ptr, val)   __atomic_store_n(ptr, val, __ATOMIC_SEQ_CST)
#define	atomic_read(ptr)   __atomic_load_n(ptr, __ATOMIC_SEQ_CST)
#define	atomic_inc(ptr)   __atomic_add_fetch(ptr, 1, __ATOMIC_SEQ_CST)
#define	atomic_dec(ptr)   __atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST)
#define	atomic_add(val, ptr)   __atomic_add_fetch(ptr, val, __ATOMIC_SEQ_CST)
#define	atomic_sub(val, ptr)   __atomic_sub_fetch(ptr, val, __ATOMIC_SEQ_CST)

Typedefs
typedef volatile int	atomic_t
	Atomic Wrapper Macros.

Functions
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 >	GetAlsaChannelLayoutAsArray (snd_pcm_t *pcmHandle)
	Put Alsa channel layout in a dynamic array of strings.
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 std::string	BuildChannelMapFilter (snd_pcm_t *pcmHandle, const AVChannelLayout &layout)
	Build the "|"-separated mappings list for the channelmap filter.
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.

Detailed Description

Audio and Alsa Interface.

Handles the audio stream and ALSA interface

Macro Definition Documentation

atomic_add

#define atomic_add	(		val,
			ptr
	)		__atomic_add_fetch(ptr, val, __ATOMIC_SEQ_CST)

Definition at line 32 of file ringbuffer.h.

atomic_dec

#define atomic_dec

(

ptr

)

__atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST)

Definition at line 31 of file ringbuffer.h.

atomic_inc

#define atomic_inc

(

ptr

)

__atomic_add_fetch(ptr, 1, __ATOMIC_SEQ_CST)

Definition at line 30 of file ringbuffer.h.

atomic_read

#define atomic_read

(

ptr

)

__atomic_load_n(ptr, __ATOMIC_SEQ_CST)

Definition at line 29 of file ringbuffer.h.

atomic_set

#define atomic_set	(		ptr,
			val
	)		__atomic_store_n(ptr, val, __ATOMIC_SEQ_CST)

Definition at line 28 of file ringbuffer.h.

atomic_sub

#define atomic_sub	(		val,
			ptr
	)		__atomic_sub_fetch(ptr, val, __ATOMIC_SEQ_CST)

Definition at line 33 of file ringbuffer.h.

Typedef Documentation

atomic_t

typedef volatile int atomic_t

Atomic Wrapper Macros.

atomic type, 24 bit useable

Definition at line 26 of file ringbuffer.h.

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 1916 of file audio.cpp.

Referenced by cSoftHdAudio::AlsaInit().

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 325 of file audio.cpp.

Referenced by GetAlsaChannelLayoutAsArray().

BuildChannelMapFilter()

static std::string BuildChannelMapFilter ( snd_pcm_t *  pcmHandle, const AVChannelLayout &  layout  )

static

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

Parameters

pcmHandle	current Alsa PCM Handle
layout	current FFmpeg channel layout

Returns

mapping string to feed into the channelmap filter

Definition at line 416 of file audio.cpp.

References GetAlsaChannelLayoutAsArray(), GetFFmpegChannelLayoutAsArray(), L_SOUND, LayoutsMatch(), LOGDEBUG2, and LOGWARNING.

Referenced by cSoftHdAudio::InitFilter().

GetAlsaChannelLayoutAsArray()

static std::vector< std::string > GetAlsaChannelLayoutAsArray ( snd_pcm_t *  pcmHandle )

static

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 342 of file audio.cpp.

References alsaToFFmpegChannel().

Referenced by cSoftHdAudio::AlsaSetup(), and BuildChannelMapFilter().

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 368 of file audio.cpp.

Referenced by 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 393 of file audio.cpp.

Referenced by BuildChannelMapFilter().