mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
158 lines
6.1 KiB
158 lines
6.1 KiB
/* |
|
* WMA compatible codec |
|
* Copyright (c) 2002-2007 The Libav Project |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; 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 "libavutil/float_dsp.h" |
|
|
|
#include "avcodec.h" |
|
#include "bitstream.h" |
|
#include "fft.h" |
|
#include "put_bits.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; |
|
BitstreamContext bc; |
|
PutBitContext pb; |
|
int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) |
|
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(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
|
float max_exponent[MAX_CHANNELS]; |
|
WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
|
DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
|
DECLARE_ALIGNED(32, 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(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; |
|
/* last frame info */ |
|
uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; /* 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)]; |
|
AVFloatDSPContext fdsp; |
|
|
|
#ifdef TRACE |
|
int frame_count; |
|
#endif /* TRACE */ |
|
} WMACodecContext; |
|
|
|
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 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(BitstreamContext *bc); |
|
int ff_wma_run_level_decode(AVCodecContext *avctx, BitstreamContext *bc, |
|
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 */
|
|
|