#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include "libavutil/float_dsp.h"
#include "libavutil/libm.h"
#include "avcodec.h"
#include "get_bits.h"
#include "bytestream.h"
#include "fft.h"
#include "fmtconvert.h"
#include "atrac.h"
#include "atrac3data.h"
Go to the source code of this file.
Data Structures | |
| struct | gain_info |
| struct | gain_block |
| struct | tonal_component |
| struct | channel_unit |
| struct | ATRAC3Context |
Defines | |
| #define | JOINT_STEREO 0x12 |
| #define | STEREO 0x2 |
| #define | SAMPLES_PER_FRAME 1024 |
| #define | MDCT_SIZE 512 |
| #define | INTERPOLATE(old, new, nsample) ((old) + (nsample)*0.125*((new)-(old))) |
Functions | |
| static void | IMLT (ATRAC3Context *q, float *pInput, float *pOutput, int odd_band) |
| Regular 512 points IMDCT without overlapping, with the exception of the swapping of odd bands caused by the reverse spectra of the QMF. | |
| static int | decode_bytes (const uint8_t *inbuffer, uint8_t *out, int bytes) |
| Atrac 3 indata descrambling, only used for data coming from the rm container. | |
| static av_cold int | init_atrac3_transforms (ATRAC3Context *q, int is_float) |
| static av_cold int | atrac3_decode_close (AVCodecContext *avctx) |
| Atrac3 uninit, free all allocated memory. | |
| static void | readQuantSpectralCoeffs (GetBitContext *gb, int selector, int codingFlag, int *mantissas, int numCodes) |
| / * Mantissa decoding | |
| static int | decodeSpectrum (GetBitContext *gb, float *pOut) |
| Restore the quantized band spectrum coefficients. | |
| static int | decodeTonalComponents (GetBitContext *gb, tonal_component *pComponent, int numBands) |
| Restore the quantized tonal components. | |
| static int | decodeGainControl (GetBitContext *gb, gain_block *pGb, int numBands) |
| Decode gain parameters for the coded bands. | |
| static void | gainCompensateAndOverlap (float *pIn, float *pPrev, float *pOut, gain_info *pGain1, gain_info *pGain2) |
| Apply gain parameters and perform the MDCT overlapping part. | |
| static int | addTonalComponents (float *pSpectrum, int numComponents, tonal_component *pComponent) |
| Combine the tonal band spectrum and regular band spectrum Return position of the last tonal coefficient. | |
| static void | reverseMatrixing (float *su1, float *su2, int *pPrevCode, int *pCurrCode) |
| static void | getChannelWeights (int indx, int flag, float ch[2]) |
| static void | channelWeighting (float *su1, float *su2, int *p3) |
| static int | decodeChannelSoundUnit (ATRAC3Context *q, GetBitContext *gb, channel_unit *pSnd, float *pOut, int channelNum, int codingMode) |
| Decode a Sound Unit. | |
| static int | decodeFrame (ATRAC3Context *q, const uint8_t *databuf, float **out_samples) |
| Frame handling. | |
| static int | atrac3_decode_frame (AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt) |
| Atrac frame decoding. | |
| static av_cold int | atrac3_decode_init (AVCodecContext *avctx) |
| Atrac3 initialization. | |
Variables | |
| static float | mdct_window [MDCT_SIZE] |
| static VLC | spectral_coeff_tab [7] |
| static float | gain_tab1 [16] |
| static float | gain_tab2 [31] |
| AVCodec | ff_atrac3_decoder |
This decoder handles Sony's ATRAC3 data.
Container formats used to store atrac 3 data: RealMedia (.rm), RIFF WAV (.wav, .at3), Sony OpenMG (.oma, .aa3).
To use this decoder, a calling application must supply the extradata bytes provided in the containers above.
Definition in file atrac3.c.
| #define INTERPOLATE | ( | old, | |||
| new, | |||||
| nsample | ) | ((old) + (nsample)*0.125*((new)-(old))) |
Definition at line 554 of file atrac3.c.
Referenced by channelWeighting(), reverseMatrixing(), and super2xsai().
| #define JOINT_STEREO 0x12 |
Definition at line 50 of file atrac3.c.
Referenced by atrac3_decode_init(), cook_decode_init(), decodeChannelSoundUnit(), decodeFrame(), and mp3lame_encode_init().
| #define SAMPLES_PER_FRAME 1024 |
Definition at line 53 of file atrac3.c.
Referenced by atrac3_decode_frame(), atrac3_decode_init(), decodeSpectrum(), and decodeTonalComponents().
| #define STEREO 0x2 |
| static int addTonalComponents | ( | float * | pSpectrum, | |
| int | numComponents, | |||
| tonal_component * | pComponent | |||
| ) | [static] |
Combine the tonal band spectrum and regular band spectrum Return position of the last tonal coefficient.
| pSpectrum | output spectrum buffer | |
| numComponents | amount of tonal components | |
| pComponent | tonal components for this band |
Definition at line 536 of file atrac3.c.
Referenced by decodeChannelSoundUnit().
| static av_cold int atrac3_decode_close | ( | AVCodecContext * | avctx | ) | [static] |
Atrac3 uninit, free all allocated memory.
Definition at line 224 of file atrac3.c.
Referenced by atrac3_decode_init().
| static int atrac3_decode_frame | ( | AVCodecContext * | avctx, | |
| void * | data, | |||
| int * | got_frame_ptr, | |||
| AVPacket * | avpkt | |||
| ) | [static] |
| static av_cold int atrac3_decode_init | ( | AVCodecContext * | avctx | ) | [static] |
| static void channelWeighting | ( | float * | su1, | |
| float * | su2, | |||
| int * | p3 | |||
| ) | [static] |
Atrac 3 indata descrambling, only used for data coming from the rm container.
| inbuffer | pointer to 8 bit array of indata | |
| out | pointer to 8 bit array of outdata | |
| bytes | amount of bytes |
Definition at line 181 of file atrac3.c.
Referenced by atrac3_decode_frame(), and decode_bytes_and_gain().
| static int decodeChannelSoundUnit | ( | ATRAC3Context * | q, | |
| GetBitContext * | gb, | |||
| channel_unit * | pSnd, | |||
| float * | pOut, | |||
| int | channelNum, | |||
| int | codingMode | |||
| ) | [static] |
Decode a Sound Unit.
| gb | the GetBit context | |
| pSnd | the channel unit to be used | |
| pOut | the decoded samples before IQMF in float representation | |
| channelNum | channel number | |
| codingMode | the coding mode (JOINT_STEREO or regular stereo/mono) |
Definition at line 668 of file atrac3.c.
Referenced by decodeFrame().
| static int decodeFrame | ( | ATRAC3Context * | q, | |
| const uint8_t * | databuf, | |||
| float ** | out_samples | |||
| ) | [static] |
Frame handling.
| q | Atrac3 private context | |
| databuf | the input data |
Definition at line 733 of file atrac3.c.
Referenced by atrac3_decode_frame().
| static int decodeGainControl | ( | GetBitContext * | gb, | |
| gain_block * | pGb, | |||
| int | numBands | |||
| ) | [static] |
Decode gain parameters for the coded bands.
| gb | the GetBit context | |
| pGb | the gainblock for the current band | |
| numBands | amount of coded bands |
Definition at line 440 of file atrac3.c.
Referenced by decodeChannelSoundUnit().
| static int decodeSpectrum | ( | GetBitContext * | gb, | |
| float * | pOut | |||
| ) | [static] |
Restore the quantized band spectrum coefficients.
| gb | the GetBit context | |
| pOut | decoded band spectrum |
Definition at line 305 of file atrac3.c.
Referenced by decodeChannelSoundUnit().
| static int decodeTonalComponents | ( | GetBitContext * | gb, | |
| tonal_component * | pComponent, | |||
| int | numBands | |||
| ) | [static] |
Restore the quantized tonal components.
| gb | the GetBit context | |
| pComponent | tone component | |
| numBands | amount of coded bands |
Definition at line 363 of file atrac3.c.
Referenced by decodeChannelSoundUnit().
| static void gainCompensateAndOverlap | ( | float * | pIn, | |
| float * | pPrev, | |||
| float * | pOut, | |||
| gain_info * | pGain1, | |||
| gain_info * | pGain2 | |||
| ) | [static] |
Apply gain parameters and perform the MDCT overlapping part.
| pIn | input float buffer | |
| pPrev | previous float buffer to perform overlap against | |
| pOut | output float buffer | |
| pGain1 | current band gain info | |
| pGain2 | next band gain info |
Definition at line 479 of file atrac3.c.
Referenced by decodeChannelSoundUnit().
| static void IMLT | ( | ATRAC3Context * | q, | |
| float * | pInput, | |||
| float * | pOutput, | |||
| int | odd_band | |||
| ) | [static] |
Regular 512 points IMDCT without overlapping, with the exception of the swapping of odd bands caused by the reverse spectra of the QMF.
| pInput | float input | |
| pOutput | float output | |
| odd_band | 1 if the band is an odd band |
Reverse the odd bands before IMDCT, this is an effect of the QMF transform or it gives better compression to do it this way. FIXME: It should be possible to handle this in imdct_calc for that to happen a modification of the prerotation step of all SIMD code and C code is needed. Or fix the functions before so they generate a pre reversed spectrum.
Definition at line 147 of file atrac3.c.
Referenced by decodeChannelSoundUnit().
| static av_cold int init_atrac3_transforms | ( | ATRAC3Context * | q, | |
| int | is_float | |||
| ) | [static] |
| static void readQuantSpectralCoeffs | ( | GetBitContext * | gb, | |
| int | selector, | |||
| int | codingFlag, | |||
| int * | mantissas, | |||
| int | numCodes | |||
| ) | [static] |
/ * Mantissa decoding
| gb | the GetBit context | |
| selector | what table is the output values coded with | |
| codingFlag | constant length coding or variable length coding | |
| mantissas | mantissa output table | |
| numCodes | amount of values to get |
Definition at line 247 of file atrac3.c.
Referenced by decodeSpectrum(), and decodeTonalComponents().
Initial value:
{
.name = "atrac3",
.type = AVMEDIA_TYPE_AUDIO,
.id = AV_CODEC_ID_ATRAC3,
.priv_data_size = sizeof(ATRAC3Context),
.init = atrac3_decode_init,
.close = atrac3_decode_close,
.decode = atrac3_decode_frame,
.capabilities = CODEC_CAP_SUBFRAMES | CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Atrac 3 (Adaptive TRansform Acoustic Coding 3)"),
}
float gain_tab1[16] [static] |
Definition at line 134 of file atrac3.c.
Referenced by atrac3_decode_init(), and gainCompensateAndOverlap().
float gain_tab2[31] [static] |
Definition at line 135 of file atrac3.c.
Referenced by atrac3_decode_init(), and gainCompensateAndOverlap().
float mdct_window[MDCT_SIZE] [static] |
VLC spectral_coeff_tab[7] [static] |
1.5.8