164 lines
6.3 KiB
C
164 lines
6.3 KiB
C
|
/*
|
||
|
|
* WMA compatible codec
|
||
|
|
* Copyright (c) 2002-2007 The FFmpeg Project
|
||
|
|
*
|
||
|
|
* This file is part of FFmpeg.
|
||
|
|
*
|
||
|
|
* FFmpeg is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU Lesser General Public
|
||
|
|
* License as published by the Free Software Foundation; either
|
||
|
|
* version 2.1 of the License, or (at your option) any later version.
|
||
|
|
*
|
||
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
||
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
* Lesser General Public License for more details.
|
||
|
|
*
|
||
|
|
* You should have received a copy of the GNU Lesser General Public
|
||
|
|
* License along with FFmpeg; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#ifndef AVCODEC_WMA_H
|
||
|
|
#define AVCODEC_WMA_H
|
||
|
|
|
||
|
|
#include "get_bits.h"
|
||
|
|
#include "put_bits.h"
|
||
|
|
#include "dsputil.h"
|
||
|
|
#include "fft.h"
|
||
|
|
|
||
|
|
/* size of blocks */
|
||
|
|
#define BLOCK_MIN_BITS 7
|
||
|
|
#define BLOCK_MAX_BITS 11
|
||
|
|
#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
|
||
|
|
|
||
|
|
#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
|
||
|
|
|
||
|
|
/* XXX: find exact max size */
|
||
|
|
#define HIGH_BAND_MAX_SIZE 16
|
||
|
|
|
||
|
|
#define NB_LSP_COEFS 10
|
||
|
|
|
||
|
|
/* XXX: is it a suitable value ? */
|
||
|
|
#define MAX_CODED_SUPERFRAME_SIZE 16384
|
||
|
|
|
||
|
|
#define MAX_CHANNELS 2
|
||
|
|
|
||
|
|
#define NOISE_TAB_SIZE 8192
|
||
|
|
|
||
|
|
#define LSP_POW_BITS 7
|
||
|
|
|
||
|
|
//FIXME should be in wmadec
|
||
|
|
#define VLCBITS 9
|
||
|
|
#define VLCMAX ((22+VLCBITS-1)/VLCBITS)
|
||
|
|
|
||
|
|
typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2
|
||
|
|
|
||
|
|
typedef struct CoefVLCTable {
|
||
|
|
int n; ///< total number of codes
|
||
|
|
int max_level;
|
||
|
|
const uint32_t *huffcodes; ///< VLC bit values
|
||
|
|
const uint8_t *huffbits; ///< VLC bit size
|
||
|
|
const uint16_t *levels; ///< table to build run/level tables
|
||
|
|
} CoefVLCTable;
|
||
|
|
|
||
|
|
typedef struct WMACodecContext {
|
||
|
|
AVCodecContext* avctx;
|
||
|
|
GetBitContext gb;
|
||
|
|
PutBitContext pb;
|
||
|
|
int sample_rate;
|
||
|
|
int nb_channels;
|
||
|
|
int bit_rate;
|
||
|
|
int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2)
|
||
|
|
int block_align;
|
||
|
|
int use_bit_reservoir;
|
||
|
|
int use_variable_block_len;
|
||
|
|
int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta
|
||
|
|
int use_noise_coding; ///< true if perceptual noise is added
|
||
|
|
int byte_offset_bits;
|
||
|
|
VLC exp_vlc;
|
||
|
|
int exponent_sizes[BLOCK_NB_SIZES];
|
||
|
|
uint16_t exponent_bands[BLOCK_NB_SIZES][25];
|
||
|
|
int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band
|
||
|
|
int coefs_start; ///< first coded coef
|
||
|
|
int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients
|
||
|
|
int exponent_high_sizes[BLOCK_NB_SIZES];
|
||
|
|
int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
|
||
|
|
VLC hgain_vlc;
|
||
|
|
|
||
|
|
/* coded values in high bands */
|
||
|
|
int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
|
||
|
|
int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
|
||
|
|
|
||
|
|
/* there are two possible tables for spectral coefficients */
|
||
|
|
//FIXME the following 3 tables should be shared between decoders
|
||
|
|
VLC coef_vlc[2];
|
||
|
|
uint16_t *run_table[2];
|
||
|
|
float *level_table[2];
|
||
|
|
uint16_t *int_table[2];
|
||
|
|
const CoefVLCTable *coef_vlcs[2];
|
||
|
|
/* frame info */
|
||
|
|
int frame_len; ///< frame length in samples
|
||
|
|
int frame_len_bits; ///< frame_len = 1 << frame_len_bits
|
||
|
|
int nb_block_sizes; ///< number of block sizes
|
||
|
|
/* block info */
|
||
|
|
int reset_block_lengths;
|
||
|
|
int block_len_bits; ///< log2 of current block length
|
||
|
|
int next_block_len_bits; ///< log2 of next block length
|
||
|
|
int prev_block_len_bits; ///< log2 of prev block length
|
||
|
|
int block_len; ///< block length in samples
|
||
|
|
int block_num; ///< block number in current frame
|
||
|
|
int block_pos; ///< current position in frame
|
||
|
|
uint8_t ms_stereo; ///< true if mid/side stereo mode
|
||
|
|
uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded
|
||
|
|
int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length
|
||
|
|
DECLARE_ALIGNED(16, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE];
|
||
|
|
float max_exponent[MAX_CHANNELS];
|
||
|
|
WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
|
||
|
|
DECLARE_ALIGNED(16, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
|
||
|
|
DECLARE_ALIGNED(16, FFTSample, output)[BLOCK_MAX_SIZE * 2];
|
||
|
|
FFTContext mdct_ctx[BLOCK_NB_SIZES];
|
||
|
|
float *windows[BLOCK_NB_SIZES];
|
||
|
|
/* output buffer for one frame and the last for IMDCT windowing */
|
||
|
|
DECLARE_ALIGNED(16, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2];
|
||
|
|
/* last frame info */
|
||
|
|
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
|
||
|
|
int last_bitoffset;
|
||
|
|
int last_superframe_len;
|
||
|
|
float noise_table[NOISE_TAB_SIZE];
|
||
|
|
int noise_index;
|
||
|
|
float noise_mult; /* XXX: suppress that and integrate it in the noise array */
|
||
|
|
/* lsp_to_curve tables */
|
||
|
|
float lsp_cos_table[BLOCK_MAX_SIZE];
|
||
|
|
float lsp_pow_e_table[256];
|
||
|
|
float lsp_pow_m_table1[(1 << LSP_POW_BITS)];
|
||
|
|
float lsp_pow_m_table2[(1 << LSP_POW_BITS)];
|
||
|
|
DSPContext dsp;
|
||
|
|
|
||
|
|
#ifdef TRACE
|
||
|
|
int frame_count;
|
||
|
|
#endif
|
||
|
|
} WMACodecContext;
|
||
|
|
|
||
|
|
extern const uint16_t ff_wma_critical_freqs[25];
|
||
|
|
extern const uint16_t ff_wma_hgain_huffcodes[37];
|
||
|
|
extern const uint8_t ff_wma_hgain_huffbits[37];
|
||
|
|
extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16];
|
||
|
|
extern const uint32_t ff_aac_scalefactor_code[121];
|
||
|
|
extern const uint8_t ff_aac_scalefactor_bits[121];
|
||
|
|
|
||
|
|
int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version,
|
||
|
|
unsigned int decode_flags);
|
||
|
|
int ff_wma_init(AVCodecContext * avctx, int flags2);
|
||
|
|
int ff_wma_total_gain_to_bits(int total_gain);
|
||
|
|
int ff_wma_end(AVCodecContext *avctx);
|
||
|
|
unsigned int ff_wma_get_large_val(GetBitContext* gb);
|
||
|
|
int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb,
|
||
|
|
VLC *vlc,
|
||
|
|
const float *level_table, const uint16_t *run_table,
|
||
|
|
int version, WMACoef *ptr, int offset,
|
||
|
|
int num_coefs, int block_len, int frame_len_bits,
|
||
|
|
int coef_nb_bits);
|
||
|
|
|
||
|
|
#endif /* AVCODEC_WMA_H */
|