/* * 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" /* 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]; uint16_t *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]); MDCTContext 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_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_wma_scale_huffcodes[121]; extern const uint8_t ff_wma_scale_huffbits[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); int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb, VLC *vlc, const uint16_t *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 */