ADPCM Decoder. More...

#include <ADPCMDecoder.h>

Inheritance diagram for adpcm_ffmpeg::ADPCMDecoder:

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Collaboration diagram for adpcm_ffmpeg::ADPCMDecoder:

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Public Member Functions
bool	begin (int sampleRate, int channels)

void	end ()

AVFrame &	decode (uint8_t *data, size_t size)

AVFrame &	decode (AVPacket &packet)

virtual std::vector< AVSampleFormat >	get_sample_format ()

void	flush ()

AVCodecContext &	ctx ()

void	setCodecID (AVCodecID id)

AVCodecID	codecID ()

void	setFrameSize (int fs)

virtual void	setBlockSize (int size)

int	blockSize ()

int	frameSize ()

int	channels ()

bool	isPlanar ()

Protected Types
enum	DataSource { Undefined , FromFrame , FromExtended }

Protected Member Functions
DataSource	getDataSource (int16_t frame_data, int16_t ext_data, int len)

virtual int	adpcm_decode_init ()
	Init decoder.

int16_t	adpcm_ima_expand_nibble (ADPCMChannelStatus *c, int8_t nibble, int shift)

int16_t	adpcm_ima_mtf_expand_nibble (ADPCMChannelStatus *c, int nibble)

int16_t	adpcm_ima_cunning_expand_nibble (ADPCMChannelStatus *c, int8_t nibble)

int	adpcm_ima_qt_expand_nibble (ADPCMChannelStatus *c, int nibble)

int16_t	adpcm_yamaha_expand_nibble (ADPCMChannelStatus *c, uint8_t nibble)

int	get_nb_samples (GetByteContext gb, int buf_size, int coded_samples, int *approx_nb_samples)

virtual void	adpcm_flush ()
	Flush decoder.

virtual int	decode_frame_impl (AVFrame frame, int got_frame_ptr, AVPacket *avpkt)=0

virtual int	adpcm_decode_frame (AVFrame frame, int got_frame_ptr, AVPacket *avpkt)
	Decode a pcm frame.

int	decode_frame_init (AVFrame frame, int got_frame_ptr, AVPacket *avpkt)

int	av_get_bits_per_sample ()

int	ff_get_encode_buffer (AVCodecContext avctx, AVPacket avpkt, int64_t size, int flags)

int	ff_get_buffer (AVCodecContext avctx, AVFrame frame, int flags)

void	avpriv_request_sample (void avc, const char msg,...)

Protected Attributes
AVPacket	packet

AVFrame	frame

DataSource	data_source = Undefined

bool	is_frame_data = true

std::vector< int16_t >	frame_data_vector

std::vector< std::vector< int16_t > >	frame_extended_data_vectors

int16_t *	extended_data [2] = {NULL}

uint8_t *	data [AV_NUM_DATA_POINTERS] = {NULL}

const uint8_t *	buf

int	buf_size

ADPCMDecodeContext *	c

int16_t *	samples

int16_t **	samples_p

int	st

int	nb_samples

int	coded_samples

int	approx_nb_samples

int	ret

GetByteContext	gb

AVCodecContext	avctx

ADPCMEncodeContext	enc_ctx

std::vector< AVSampleFormat >	sample_formats

Detailed Description

ADPCM Decoder.

Author: Phil Schatzmann

Copyright: GPLv3

Member Function Documentation

◆ decode()

AVFrame& adpcm_ffmpeg::ADPCMDecoder::decode ( AVPacket & packet )

inline

determine data source: only once

◆ get_nb_samples()

int adpcm_ffmpeg::ADPCMDecoder::get_nb_samples	(	GetByteContext *	gb,
		int	buf_size,
		int *	coded_samples,
		int *	approx_nb_samples
	)

inlineprotected

Get the number of samples (per channel) that will be decoded from the packet. In one case, this is actually the maximum number of samples possible to decode with the given buf_size.

Parameters

[out]	coded_samples	set to the number of samples as coded in the packet, or 0 if the codec does not encode the number of samples in each frame.
[out]	approx_nb_samples	set to non-zero if the number of samples returned is an approximation.

◆ getDataSource()

DataSource adpcm_ffmpeg::ADPCMDecoder::getDataSource	(	int16_t *	frame_data,
		int16_t *	ext_data,
		int	len
	)

inlineprotected

The result is not returned consistently: sometimes it is in the frame data, sometimes it is in the extra data. Here we check where it actually is!

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

src/ADPCMDecoder.h

Public Member Functions

Protected Types

Protected Member Functions

Protected Attributes

Detailed Description

Member Function Documentation

◆ decode()

◆ get_nb_samples()

◆ getDataSource()