yading@10: /* yading@10: * WMA compatible codec yading@10: * Copyright (c) 2002-2007 The FFmpeg Project yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #ifndef AVCODEC_WMA_H yading@10: #define AVCODEC_WMA_H yading@10: yading@10: #include "libavutil/float_dsp.h" yading@10: #include "get_bits.h" yading@10: #include "put_bits.h" yading@10: #include "fft.h" yading@10: #include "fmtconvert.h" yading@10: yading@10: /* size of blocks */ yading@10: #define BLOCK_MIN_BITS 7 yading@10: #define BLOCK_MAX_BITS 11 yading@10: #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) yading@10: yading@10: #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) yading@10: yading@10: /* XXX: find exact max size */ yading@10: #define HIGH_BAND_MAX_SIZE 16 yading@10: yading@10: #define NB_LSP_COEFS 10 yading@10: yading@10: /* XXX: is it a suitable value ? */ yading@10: #define MAX_CODED_SUPERFRAME_SIZE 16384 yading@10: yading@10: #define MAX_CHANNELS 2 yading@10: yading@10: #define NOISE_TAB_SIZE 8192 yading@10: yading@10: #define LSP_POW_BITS 7 yading@10: yading@10: //FIXME should be in wmadec yading@10: #define VLCBITS 9 yading@10: #define VLCMAX ((22+VLCBITS-1)/VLCBITS) yading@10: yading@10: typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2 yading@10: yading@10: typedef struct CoefVLCTable { yading@10: int n; ///< total number of codes yading@10: int max_level; yading@10: const uint32_t *huffcodes; ///< VLC bit values yading@10: const uint8_t *huffbits; ///< VLC bit size yading@10: const uint16_t *levels; ///< table to build run/level tables yading@10: } CoefVLCTable; yading@10: yading@10: typedef struct WMACodecContext { yading@10: AVCodecContext* avctx; yading@10: GetBitContext gb; yading@10: PutBitContext pb; yading@10: int version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) yading@10: int use_bit_reservoir; yading@10: int use_variable_block_len; yading@10: int use_exp_vlc; ///< exponent coding: 0 = lsp, 1 = vlc + delta yading@10: int use_noise_coding; ///< true if perceptual noise is added yading@10: int byte_offset_bits; yading@10: VLC exp_vlc; yading@10: int exponent_sizes[BLOCK_NB_SIZES]; yading@10: uint16_t exponent_bands[BLOCK_NB_SIZES][25]; yading@10: int high_band_start[BLOCK_NB_SIZES]; ///< index of first coef in high band yading@10: int coefs_start; ///< first coded coef yading@10: int coefs_end[BLOCK_NB_SIZES]; ///< max number of coded coefficients yading@10: int exponent_high_sizes[BLOCK_NB_SIZES]; yading@10: int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; yading@10: VLC hgain_vlc; yading@10: yading@10: /* coded values in high bands */ yading@10: int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; yading@10: int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; yading@10: yading@10: /* there are two possible tables for spectral coefficients */ yading@10: //FIXME the following 3 tables should be shared between decoders yading@10: VLC coef_vlc[2]; yading@10: uint16_t *run_table[2]; yading@10: float *level_table[2]; yading@10: uint16_t *int_table[2]; yading@10: const CoefVLCTable *coef_vlcs[2]; yading@10: /* frame info */ yading@10: int frame_len; ///< frame length in samples yading@10: int frame_len_bits; ///< frame_len = 1 << frame_len_bits yading@10: int nb_block_sizes; ///< number of block sizes yading@10: /* block info */ yading@10: int reset_block_lengths; yading@10: int block_len_bits; ///< log2 of current block length yading@10: int next_block_len_bits; ///< log2 of next block length yading@10: int prev_block_len_bits; ///< log2 of prev block length yading@10: int block_len; ///< block length in samples yading@10: int block_num; ///< block number in current frame yading@10: int block_pos; ///< current position in frame yading@10: uint8_t ms_stereo; ///< true if mid/side stereo mode yading@10: uint8_t channel_coded[MAX_CHANNELS]; ///< true if channel is coded yading@10: int exponents_bsize[MAX_CHANNELS]; ///< log2 ratio frame/exp. length yading@10: DECLARE_ALIGNED(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE]; yading@10: float max_exponent[MAX_CHANNELS]; yading@10: WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; yading@10: DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE]; yading@10: DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2]; yading@10: FFTContext mdct_ctx[BLOCK_NB_SIZES]; yading@10: float *windows[BLOCK_NB_SIZES]; yading@10: /* output buffer for one frame and the last for IMDCT windowing */ yading@10: DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; yading@10: /* last frame info */ yading@10: uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + FF_INPUT_BUFFER_PADDING_SIZE]; /* padding added */ yading@10: int last_bitoffset; yading@10: int last_superframe_len; yading@10: float noise_table[NOISE_TAB_SIZE]; yading@10: int noise_index; yading@10: float noise_mult; /* XXX: suppress that and integrate it in the noise array */ yading@10: /* lsp_to_curve tables */ yading@10: float lsp_cos_table[BLOCK_MAX_SIZE]; yading@10: float lsp_pow_e_table[256]; yading@10: float lsp_pow_m_table1[(1 << LSP_POW_BITS)]; yading@10: float lsp_pow_m_table2[(1 << LSP_POW_BITS)]; yading@10: FmtConvertContext fmt_conv; yading@10: AVFloatDSPContext fdsp; yading@10: yading@10: #ifdef TRACE yading@10: int frame_count; yading@10: #endif yading@10: } WMACodecContext; yading@10: yading@10: extern const uint16_t ff_wma_critical_freqs[25]; yading@10: extern const uint16_t ff_wma_hgain_huffcodes[37]; yading@10: extern const uint8_t ff_wma_hgain_huffbits[37]; yading@10: extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; yading@10: extern const uint32_t ff_aac_scalefactor_code[121]; yading@10: extern const uint8_t ff_aac_scalefactor_bits[121]; yading@10: yading@10: int ff_wma_init(AVCodecContext * avctx, int flags2); yading@10: int ff_wma_total_gain_to_bits(int total_gain); yading@10: int ff_wma_end(AVCodecContext *avctx); yading@10: unsigned int ff_wma_get_large_val(GetBitContext* gb); yading@10: int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb, yading@10: VLC *vlc, yading@10: const float *level_table, const uint16_t *run_table, yading@10: int version, WMACoef *ptr, int offset, yading@10: int num_coefs, int block_len, int frame_len_bits, yading@10: int coef_nb_bits); yading@10: yading@10: #endif /* AVCODEC_WMA_H */