FFMpeg Audio Decoder Frontend. More...

Classes
class	cAudioDecoder
	Audio Decoder. More...

Enumerations
enum	PassthroughMask { CODEC_AC3 = (1 << 2) , CODEC_EAC3 = (1 << 3) , CODEC_DTS = (1 << 4) }
	Bits used for the passthrough mask. More...

enum	IEC61937Type { IEC61937_NULL = 0x00 , IEC61937_AC3 = 0x01 , IEC61937_EAC3 = 0x15 , IEC61937_DTS1 = 0x0B , IEC61937_DTS2 = 0x0C , IEC61937_DTS3 = 0x0D , IEC61937_DTSHD = 0x11 , IEC61937_TRUEHD = 0x16 }
	IEC Data type. More...

enum	IEC61937Preamble { IEC61937_PREAMBLE1 = 0xF872 , IEC61937_PREAMBLE2 = 0x4E1F , DTS_PREAMBLE_16BE_1 = 0x7FFE , DTS_PREAMBLE_16BE_2 = 0x8001 }
	IEC Preambles. More...

enum	CodecFrameSizes { DTS1_FRAME_SIZE = 512 , DTS2_FRAME_SIZE = 1024 , DTS3_FRAME_SIZE = 2048 , AC3_FRAME_SIZE = 1536 , EAC3_FRAME_SIZE = 6144 , MAX_FRAME_SIZE = EAC3_FRAME_SIZE , TRUEHD_FRAME_SIZE = 15360 }
	Codec frame sizes for spdif. More...

Functions
	cAudioDecoder::cAudioDecoder (cSoftHdAudio *)
	Create a new audio decoder for the given audio context.

	cAudioDecoder::~cAudioDecoder (void)

void	cAudioDecoder::Open (AVCodecID, AVCodecParameters *=nullptr, AVRational={ .num=1,.den=90000 })
	Open and initiate the audio decoder.

void	cAudioDecoder::Close (void)
	Close the audio decoder.

int	cAudioDecoder::DecodePassthrough (const AVPacket , AVFrame )
	Passthrough audio data.

int	cAudioDecoder::UpdateFormat (void)
	Handle audio format changes.

void	cAudioDecoder::Decode (const AVPacket *)
	Decode an audio packet.

void	cAudioDecoder::FlushBuffers (void)
	Flush the audio decoder buffers.

void	cAudioDecoder::ResetSpdif (void)

void	cAudioDecoder::SetPassthroughMask (int)
	Set audio pass-through mask.

Detailed Description

FFMpeg Audio Decoder Frontend.

Enumeration Type Documentation

◆ CodecFrameSizes

enum CodecFrameSizes

Codec frame sizes for spdif.

Enumerator
DTS1_FRAME_SIZE
DTS2_FRAME_SIZE
DTS3_FRAME_SIZE
AC3_FRAME_SIZE
EAC3_FRAME_SIZE
MAX_FRAME_SIZE
TRUEHD_FRAME_SIZE	(not used)

Definition at line 67 of file codec_audio.h.

◆ IEC61937Preamble

enum IEC61937Preamble

IEC Preambles.

Enumerator
IEC61937_PREAMBLE1
IEC61937_PREAMBLE2
DTS_PREAMBLE_16BE_1
DTS_PREAMBLE_16BE_2

Definition at line 57 of file codec_audio.h.

◆ IEC61937Type

enum IEC61937Type

IEC Data type.

Enumerator
IEC61937_NULL	no data
IEC61937_AC3	AC-3 data.
IEC61937_EAC3	E-AC-3 data.
IEC61937_DTS1	DTS type I (512 samples)
IEC61937_DTS2	DTS type II (1024 samples)
IEC61937_DTS3	DTS type III (2048 samples)
IEC61937_DTSHD	DTS HD data (not used)
IEC61937_TRUEHD	TrueHD data (not used)

Definition at line 43 of file codec_audio.h.

◆ PassthroughMask

enum PassthroughMask

Bits used for the passthrough mask.

0x01 and 0x02 are kept unused for compatibility with an existing setup.conf

Enumerator
CODEC_AC3	AC-3 bit mask.
CODEC_EAC3	E-AC-3 bit mask.
CODEC_DTS	DTS bit mask.

Definition at line 34 of file codec_audio.h.

Function Documentation

◆ cAudioDecoder()

cAudioDecoder::cAudioDecoder ( cSoftHdAudio * audio )

Create a new audio decoder for the given audio context.

Parameters

audio audio context

Definition at line 41 of file codec_audio.cpp.

References L_CODEC, LOGDEBUG2, LOGFATAL, cAudioDecoder::m_passthroughMask, and cAudioDecoder::m_pFrame.

◆ Close()

void cAudioDecoder::Close ( void )

Close the audio decoder.

Definition at line 111 of file codec_audio.cpp.

References AV_NOPTS_VALUE, L_CODEC, LOGDEBUG2, cAudioDecoder::m_codecId, cAudioDecoder::m_lastPts, and cAudioDecoder::m_pAudioCtx.

Referenced by cSoftHdDevice::PlayAudio(), and cAudioDecoder::~cAudioDecoder().

◆ Decode()

void cAudioDecoder::Decode ( const AVPacket * avpkt )

Decode an audio packet.

Parameters

avpkt audio packet to decode

Definition at line 358 of file codec_audio.cpp.

References av_err2str, AV_NOPTS_VALUE, cAudioDecoder::DecodePassthrough(), cSoftHdAudio::Filter(), LOGERROR, cAudioDecoder::m_currentHwNumChannels, cAudioDecoder::m_currentHwSampleRate, cAudioDecoder::m_currentNumChannels, cAudioDecoder::m_currentPassthrough, cAudioDecoder::m_currentSampleRate, cAudioDecoder::m_lastPts, cAudioDecoder::m_passthroughMask, cAudioDecoder::m_pAudio, cAudioDecoder::m_pAudioCtx, cAudioDecoder::m_pFrame, and cAudioDecoder::UpdateFormat().

Referenced by cSoftHdDevice::PlayAudio(), and cSoftHdDevice::PlayAudioPkts().

◆ DecodePassthrough()

int cAudioDecoder::DecodePassthrough	(	const AVPacket *	avpkt,
		AVFrame *	frame
	)

private

Passthrough audio data.

Build spdif headers depending on the codec and send the data to the audio device. Currently supported: AC3, EAC3, DTS

Parameters

avpkt	undecoded audio packet
frame	decoded audio frame

Return values

0	codec is not supported for passthrough, use Filter to handle the data
-1	sth went wrong, data will be discarded
1	data accepted if finished, spdif header was created and data was sent to passthrough device

Definition at line 136 of file codec_audio.cpp.

References AC3_FRAME_SIZE, CODEC_AC3, CODEC_DTS, CODEC_EAC3, DTS1_FRAME_SIZE, DTS2_FRAME_SIZE, DTS3_FRAME_SIZE, DTS_PREAMBLE_16BE_1, DTS_PREAMBLE_16BE_2, EAC3_FRAME_SIZE, cSoftHdAudio::EnqueueSpdif(), IEC61937_AC3, IEC61937_DTS1, IEC61937_DTS2, IEC61937_DTS3, IEC61937_EAC3, IEC61937_NULL, IEC61937_PREAMBLE1, IEC61937_PREAMBLE2, LOGERROR, cAudioDecoder::m_currentHwSampleRate, cAudioDecoder::m_passthroughMask, cAudioDecoder::m_pAudio, cAudioDecoder::m_pAudioCtx, cAudioDecoder::m_spdifIndex, cAudioDecoder::m_spdifOutput, cAudioDecoder::m_spdifRepeatCount, cAudioDecoder::ResetSpdif(), and cSoftHdAudio::SetTimebase().