/* * WMA compatible decoder * Copyright (c) 2002 The FFmpeg Project. * * This library 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 of the License, or (at your option) any later version. * * This library 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 this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _WMADEC_H #define _WMADEC_H #include #include "ffmpeg_get_bits.h" #include "types.h" //#define TRACE /* 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 M_PI 3.14159265358979323846 #define M_PI_F 0x3243f // in fixed 32 format #define TWO_M_PI_F 0x6487f //in fixed 32 #define MAX_CHANNELS 2 #define NOISE_TAB_SIZE 8192 #define LSP_POW_BITS 7 #if (CONFIG_CPU == PP5022) || (CONFIG_CPU == PP5024) || (CONFIG_CPU == MCF5250) /* PP5022/24 and MCF5250 have 128KB of IRAM. 80KB are allocated for codecs */ #define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR #define IBSS_ATTR_WMA_XL_IRAM #define ICONST_ATTR_WMA_XL_IRAM #elif defined(CPU_S5L870X) /* S5L870x has even more IRAM. Use it. */ #define IBSS_ATTR_WMA_LARGE_IRAM IBSS_ATTR #define IBSS_ATTR_WMA_XL_IRAM IBSS_ATTR #define ICONST_ATTR_WMA_XL_IRAM ICONST_ATTR #else /* other PP's and MCF5249 have 96KB of IRAM */ #define IBSS_ATTR_WMA_LARGE_IRAM #define IBSS_ATTR_WMA_XL_IRAM #define ICONST_ATTR_WMA_XL_IRAM #endif #define VLCBITS 7 /*7 is the lowest without glitching*/ #define VLCMAX ((22+VLCBITS-1)/VLCBITS) #define EXPVLCBITS 7 #define EXPMAX ((19+EXPVLCBITS-1)/EXPVLCBITS) #define HGAINVLCBITS 9 #define HGAINMAX ((13+HGAINVLCBITS-1)/HGAINVLCBITS) typedef struct CoefVLCTable { int n; /* total number of codes */ 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; /* Define MEM_ALIGN_ATTR which may be used to align e.g. buffers for faster * access. */ #if defined(CPU_ARM) /* Use ARMs cache alignment. */ #define MEM_ALIGN_ATTR CACHEALIGN_ATTR #define MEM_ALIGN_SIZE CACHEALIGN_SIZE #elif defined(CPU_COLDFIRE) /* Use fixed alignment of 16 bytes. Speed up only for 'movem' in DRAM. */ #define MEM_ALIGN_ATTR __attribute__((aligned(16))) #define MEM_ALIGN_SIZE 16 #else /* Align pointer size */ #define MEM_ALIGN_ATTR __attribute__((aligned(sizeof(intptr_t)))) #define MEM_ALIGN_SIZE sizeof(intptr_t) #endif typedef struct WMADecodeContext { GetBitContext gb; int nb_block_sizes; /* number of block sizes */ 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 */ VLC coef_vlc[2]; uint16_t *run_table[2]; uint16_t *level_table[2]; /* frame info */ int frame_len; /* frame length in samples */ int frame_len_bits; /* frame_len = 1 << frame_len_bits */ /* 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 fixed32 exponents[MAX_CHANNELS][BLOCK_MAX_SIZE] MEM_ALIGN_ATTR; fixed32 max_exponent[MAX_CHANNELS]; int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; fixed32 coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]; fixed32 *windows[BLOCK_NB_SIZES]; /* output buffer for one frame and the last for IMDCT windowing */ fixed32 frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE*2]; /* last frame info */ uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4] MEM_ALIGN_ATTR; /* padding added */ int last_bitoffset; int last_superframe_len; fixed32 *noise_table; int noise_index; fixed32 noise_mult; /* XXX: suppress that and integrate it in the noise array */ /* lsp_to_curve tables */ fixed32 lsp_cos_table[BLOCK_MAX_SIZE] MEM_ALIGN_ATTR; void *lsp_pow_m_table1; void *lsp_pow_m_table2; /* State of current superframe decoding */ int bit_offset; int nb_frames; int current_frame; #ifdef TRACE int frame_count; #endif } WMADecodeContext; int wma_decode_init(WMADecodeContext* s, asf_waveformatex_t *wfx); int wma_decode_superframe_init(WMADecodeContext* s, const uint8_t *buf, int buf_size); int wma_decode_superframe_frame(WMADecodeContext* s, const uint8_t *buf, int buf_size); #endif