FFmpeg: libavcodec/atrac3plus.h File Reference

Enumerator:: CH_UNIT_MONO
unit containing one coded channel

CH_UNIT_STEREO
unit containing two jointly-coded channels

CH_UNIT_EXTENSION
unit containing extension information

CH_UNIT_TERMINATOR
unit sequence terminator

Definition at line 50 of file atrac3plus.h.

Function Documentation

void ff_atrac3p_init_vlcs ( void )

Initialize VLC tables for bitstream parsing.

Definition at line 83 of file atrac3plus.c.

Referenced by atrac3p_decode_init().

int ff_atrac3p_decode_channel_unit ( GetBitContext * gb,

Atrac3pChanUnitCtx * ctx,

int num_channels,

AVCodecContext * avctx

)

Decode bitstream data of a channel unit.

Parameters: [in] gb the GetBit context

[in,out] ctx ptr to the channel unit context

[in] num_channels number of channels to process

[in] avctx ptr to the AVCodecContext

Returns: result code: 0 = OK, otherwise - error code

Definition at line 1764 of file atrac3plus.c.

Referenced by atrac3p_decode_frame().

void ff_atrac3p_init_imdct ( AVCodecContext * avctx,

FFTContext * mdct_ctx

)

Initialize IMDCT transform.

Parameters: [in] avctx ptr to the AVCodecContext

[in] mdct_ctx pointer to MDCT transform context

Definition at line 79 of file atrac3plusdsp.c.

Referenced by atrac3p_decode_init().

void ff_atrac3p_init_wave_synth ( void )

Initialize sine waves synthesizer.

Definition at line 96 of file atrac3plusdsp.c.

Referenced by atrac3p_decode_init().

void ff_atrac3p_generate_tones ( Atrac3pChanUnitCtx * ch_unit,

AVFloatDSPContext * fdsp,

int ch_num,

int sb,

float * out

)

Synthesize sine waves for a particular subband.

Parameters: [in] ch_unit pointer to the channel unit context

[in] fdsp pointer to float DSP context

[in] ch_num which channel to process

[in] sb which subband to process

[out] out receives processed data

Definition at line 177 of file atrac3plusdsp.c.

Referenced by reconstruct_frame().

void ff_atrac3p_power_compensation ( Atrac3pChanUnitCtx * ctx,

int ch_index,

float * sp,

int rng_index,

int sb_num

)

Perform power compensation aka noise dithering.

Parameters: [in] ctx ptr to the channel context

[in] ch_index which channel to process

[in,out] sp ptr to channel spectrum to process

[in] rng_index indicates which RNG table to use

[in] sb_num which subband to process

Definition at line 411 of file atrac3plusdsp.c.

Referenced by decode_residual_spectrum().

void ff_atrac3p_imdct ( AVFloatDSPContext * fdsp,

FFTContext * mdct_ctx,

float * pIn,

float * pOut,

int wind_id,

int sb

)

Regular IMDCT and windowing without overlapping, with spectrum reversal in the odd subbands.

Parameters: [in] fdsp pointer to float DSP context

[in] mdct_ctx pointer to MDCT transform context

[in] pIn float input

[out] pOut float output

[in] wind_id which MDCT window to apply

[in] sb subband number

Definition at line 457 of file atrac3plusdsp.c.

Referenced by reconstruct_frame().

void ff_atrac3p_ipqf ( FFTContext * dct_ctx,

Atrac3pIPQFChannelCtx * hist,

const float * in,

float * out

)

Subband synthesis filter based on the polyphase quadrature (pseudo-QMF) filter bank.

Parameters: [in] dct_ctx ptr to the pre-initialized IDCT context

[in,out] hist ptr to the filter history

[in] in input data to process

[out] out receives processed data

Definition at line 598 of file atrac3plusdsp.c.

Referenced by reconstruct_frame().

Variable Documentation

const uint16_t ff_atrac3p_qu_to_spec_pos[33]

Map quant unit number to its position in the spectrum.

To get the number of spectral lines in each quant unit do the following: num_specs = qu_to_spec_pos[i+1] - qu_to_spec_pos[i]

Definition at line 41 of file atrac3plusdsp.c.

Referenced by decode_residual_spectrum(), decode_spectrum(), and ff_atrac3p_power_compensation().

const float ff_atrac3p_sf_tab[64]

Definition at line 51 of file atrac3plusdsp.c.

Referenced by decode_residual_spectrum(), and ff_atrac3p_power_compensation().

const float ff_atrac3p_mant_tab[8]

Definition at line 66 of file atrac3plusdsp.c.

Referenced by decode_residual_spectrum(), and ff_atrac3p_power_compensation().

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