#include <math.h>
#include <stddef.h>
#include <stdio.h>
#include "avcodec.h"
#include "get_bits.h"
#include "dsputil.h"
#include "fft.h"
#include "atrac.h"
#include "atrac1data.h"
Go to the source code of this file.
Data Structures | |
| struct | AT1SUCtx |
| Sound unit struct, one unit is used per channel. More... | |
| struct | AT1Ctx |
| The atrac1 context, holds all needed parameters for decoding. More... | |
Defines | |
| #define | AT1_MAX_BFU 52 |
| max number of block floating units in a sound unit | |
| #define | AT1_SU_SIZE 212 |
| number of bytes in a sound unit | |
| #define | AT1_SU_SAMPLES 512 |
| number of samples in a sound unit | |
| #define | AT1_FRAME_SIZE AT1_SU_SIZE * 2 |
| #define | AT1_SU_MAX_BITS AT1_SU_SIZE * 8 |
| #define | AT1_MAX_CHANNELS 2 |
| #define | AT1_QMF_BANDS 3 |
| #define | IDX_LOW_BAND 0 |
| #define | IDX_MID_BAND 1 |
| #define | IDX_HIGH_BAND 2 |
Functions | |
| static void | at1_imdct (AT1Ctx *q, float *spec, float *out, int nbits, int rev_spec) |
| static int | at1_imdct_block (AT1SUCtx *su, AT1Ctx *q) |
| static int | at1_parse_bsm (GetBitContext *gb, int log2_block_cnt[AT1_QMF_BANDS]) |
| Parse the block size mode byte. | |
| static int | at1_unpack_dequant (GetBitContext *gb, AT1SUCtx *su, float spec[AT1_SU_SAMPLES]) |
| static void | at1_subband_synthesis (AT1Ctx *q, AT1SUCtx *su, float *pOut) |
| static int | atrac1_decode_frame (AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) |
| static av_cold int | atrac1_decode_init (AVCodecContext *avctx) |
| static av_cold int | atrac1_decode_end (AVCodecContext *avctx) |
Variables | |
| static const uint16_t | samples_per_band [3] = {128, 128, 256} |
| size of the transform in samples in the long mode for each QMF band | |
| static const uint8_t | mdct_long_nbits [3] = {7, 7, 8} |
| AVCodec | atrac1_decoder |
This decoder handles raw ATRAC1 data and probably SDDS data.
Definition in file atrac1.c.
| #define AT1_MAX_BFU 52 |
max number of block floating units in a sound unit
Definition at line 43 of file atrac1.c.
Referenced by at1_unpack_dequant().
| #define AT1_QMF_BANDS 3 |
| #define AT1_SU_MAX_BITS AT1_SU_SIZE * 8 |
| #define AT1_SU_SAMPLES 512 |
number of samples in a sound unit
Definition at line 45 of file atrac1.c.
Referenced by atrac1_decode_frame().
| #define AT1_SU_SIZE 212 |
number of bytes in a sound unit
Definition at line 44 of file atrac1.c.
Referenced by aea_read_header().
| #define IDX_HIGH_BAND 2 |
| static void at1_imdct | ( | AT1Ctx * | q, | |
| float * | spec, | |||
| float * | out, | |||
| int | nbits, | |||
| int | rev_spec | |||
| ) | [static] |
| static int at1_parse_bsm | ( | GetBitContext * | gb, | |
| int | log2_block_cnt[AT1_QMF_BANDS] | |||
| ) | [static] |
Parse the block size mode byte.
Definition at line 167 of file atrac1.c.
Referenced by atrac1_decode_frame().
| static int at1_unpack_dequant | ( | GetBitContext * | gb, | |
| AT1SUCtx * | su, | |||
| float | spec[AT1_SU_SAMPLES] | |||
| ) | [static] |
< the word length indexes for each BFU
< the scalefactor indexes for each BFU
Definition at line 190 of file atrac1.c.
Referenced by atrac1_decode_frame().
| static av_cold int atrac1_decode_end | ( | AVCodecContext * | avctx | ) | [static] |
| static int atrac1_decode_frame | ( | AVCodecContext * | avctx, | |
| void * | data, | |||
| int * | data_size, | |||
| AVPacket * | avpkt | |||
| ) | [static] |
| static av_cold int atrac1_decode_init | ( | AVCodecContext * | avctx | ) | [static] |
Initial value:
{
.name = "atrac1",
.type = AVMEDIA_TYPE_AUDIO,
.id = CODEC_ID_ATRAC1,
.priv_data_size = sizeof(AT1Ctx),
.init = atrac1_decode_init,
.close = atrac1_decode_end,
.decode = atrac1_decode_frame,
.long_name = NULL_IF_CONFIG_SMALL("Atrac 1 (Adaptive TRansform Acoustic Coding)"),
}
const uint8_t mdct_long_nbits[3] = {7, 7, 8} [static] |
const uint16_t samples_per_band[3] = {128, 128, 256} [static] |
size of the transform in samples in the long mode for each QMF band
Definition at line 87 of file atrac1.c.
Referenced by at1_imdct_block().
1.5.8