150 lines
5.0 KiB
C
150 lines
5.0 KiB
C
/*
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* WMA compatible decoder
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* Copyright (c) 2002 The FFmpeg Project.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef _WMADEC_H
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#define _WMADEC_H
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#include "asf.h"
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#include "wmabitstream.h" /* For GetBitContext */
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#include "types.h"
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//#define TRACE
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/* size of blocks */
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#define BLOCK_MIN_BITS 7
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#define BLOCK_MAX_BITS 11
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#define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS)
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#define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1)
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/* XXX: find exact max size */
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#define HIGH_BAND_MAX_SIZE 16
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#define NB_LSP_COEFS 10
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/* XXX: is it a suitable value ? */
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#define MAX_CODED_SUPERFRAME_SIZE 16384
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#define M_PI 3.14159265358979323846
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#define M_PI_F 0x3243f // in fixed 32 format
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#define TWO_M_PI_F 0x6487f //in fixed 32
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#define MAX_CHANNELS 2
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#define NOISE_TAB_SIZE 8192
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#define LSP_POW_BITS 7
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/*define IRAM for targets with 48k/80k IRAM split*/
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#ifndef IBSS_ATTR_WMA_LARGE_IRAM
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#if (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024)
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/* PP5022/24 and MCF5250 have 128KB of IRAM, but only PP5022+ have 80KB allocated for codecs */
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#define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR
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#else
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/* other PP's and MCF5249 have 96KB of IRAM */
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#define IBSS_ATTR_WMA_LARGE_IRAM
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#endif
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#endif
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typedef struct WMADecodeContext
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{
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GetBitContext gb;
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int nb_block_sizes; /* number of block sizes */
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int sample_rate;
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int nb_channels;
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int bit_rate;
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int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */
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int block_align;
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int use_bit_reservoir;
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int use_variable_block_len;
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int use_exp_vlc; /* exponent coding: 0 = lsp, 1 = vlc + delta */
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int use_noise_coding; /* true if perceptual noise is added */
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int byte_offset_bits;
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VLC exp_vlc;
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int exponent_sizes[BLOCK_NB_SIZES];
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uint16_t exponent_bands[BLOCK_NB_SIZES][25];
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int high_band_start[BLOCK_NB_SIZES]; /* index of first coef in high band */
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int coefs_start; /* first coded coef */
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int coefs_end[BLOCK_NB_SIZES]; /* max number of coded coefficients */
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int exponent_high_sizes[BLOCK_NB_SIZES];
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int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE];
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VLC hgain_vlc;
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/* coded values in high bands */
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int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
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int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE];
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/* there are two possible tables for spectral coefficients */
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VLC coef_vlc[2];
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uint16_t *run_table[2];
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uint16_t *level_table[2];
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/* frame info */
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int frame_len; /* frame length in samples */
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int frame_len_bits; /* frame_len = 1 << frame_len_bits */
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/* block info */
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int reset_block_lengths;
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int block_len_bits; /* log2 of current block length */
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int next_block_len_bits; /* log2 of next block length */
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int prev_block_len_bits; /* log2 of prev block length */
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int block_len; /* block length in samples */
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int block_num; /* block number in current frame */
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int block_pos; /* current position in frame */
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uint8_t ms_stereo; /* true if mid/side stereo mode */
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uint8_t channel_coded[MAX_CHANNELS]; /* true if channel is coded */
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int exponents_bsize[MAX_CHANNELS]; // log2 ratio frame/exp. length
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fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE];
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fixed32 max_exponent[MAX_CHANNELS];
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int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE];
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fixed32 (*coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
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fixed32 *windows[BLOCK_NB_SIZES];
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/* output buffer for one frame and the last for IMDCT windowing */
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fixed32 (*frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE*2];
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/* last frame info */
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uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */
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int last_bitoffset;
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int last_superframe_len;
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fixed32 *noise_table;
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int noise_index;
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fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */
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/* lsp_to_curve tables */
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fixed32 lsp_cos_table[BLOCK_MAX_SIZE];
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fixed64 lsp_pow_e_table[256];
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fixed32 lsp_pow_m_table1[(1 << LSP_POW_BITS)];
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fixed32 lsp_pow_m_table2[(1 << LSP_POW_BITS)];
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/* State of current superframe decoding */
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int bit_offset;
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int nb_frames;
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int current_frame;
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#ifdef TRACE
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int frame_count;
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#endif
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} WMADecodeContext;
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int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx);
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int wma_decode_superframe_init(WMADecodeContext* s, const uint8_t *buf, int buf_size);
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int wma_decode_superframe_frame(WMADecodeContext* s, int32_t *samples, const uint8_t *buf, int buf_size);
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#endif
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