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161 lines
6.2 KiB
161 lines
6.2 KiB
/* |
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* WMA compatible codec |
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* Copyright (c) 2002-2007 The FFmpeg Project |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg 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 FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVCODEC_WMA_H |
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#define AVCODEC_WMA_H |
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#include "get_bits.h" |
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#include "put_bits.h" |
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#include "dsputil.h" |
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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 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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//FIXME should be in wmadec |
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#define VLCBITS 9 |
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#define VLCMAX ((22+VLCBITS-1)/VLCBITS) |
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typedef float WMACoef; ///< type for decoded coefficients, int16_t would be enough for wma 1/2 |
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typedef struct CoefVLCTable { |
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int n; ///< total number of codes |
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int max_level; |
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const uint32_t *huffcodes; ///< VLC bit values |
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const uint8_t *huffbits; ///< VLC bit size |
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const uint16_t *levels; ///< table to build run/level tables |
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} CoefVLCTable; |
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typedef struct WMACodecContext { |
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AVCodecContext* avctx; |
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GetBitContext gb; |
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PutBitContext pb; |
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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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//FIXME the following 3 tables should be shared between decoders |
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VLC coef_vlc[2]; |
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uint16_t *run_table[2]; |
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float *level_table[2]; |
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uint16_t *int_table[2]; |
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const CoefVLCTable *coef_vlcs[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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int nb_block_sizes; ///< number of block sizes |
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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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DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]); |
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float max_exponent[MAX_CHANNELS]; |
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WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
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DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]); |
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DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]); |
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FFTContext mdct_ctx[BLOCK_NB_SIZES]; |
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float *windows[BLOCK_NB_SIZES]; |
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/* output buffer for one frame and the last for IMDCT windowing */ |
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DECLARE_ALIGNED_16(float, 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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float noise_table[NOISE_TAB_SIZE]; |
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int noise_index; |
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float noise_mult; /* XXX: suppress that and integrate it in the noise array */ |
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/* lsp_to_curve tables */ |
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float lsp_cos_table[BLOCK_MAX_SIZE]; |
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float lsp_pow_e_table[256]; |
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float lsp_pow_m_table1[(1 << LSP_POW_BITS)]; |
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float lsp_pow_m_table2[(1 << LSP_POW_BITS)]; |
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DSPContext dsp; |
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#ifdef TRACE |
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int frame_count; |
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#endif |
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} WMACodecContext; |
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extern const uint16_t ff_wma_hgain_huffcodes[37]; |
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extern const uint8_t ff_wma_hgain_huffbits[37]; |
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extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; |
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extern const uint32_t ff_wma_scale_huffcodes[121]; |
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extern const uint8_t ff_wma_scale_huffbits[121]; |
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int av_cold ff_wma_get_frame_len_bits(int sample_rate, int version, |
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unsigned int decode_flags); |
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int ff_wma_init(AVCodecContext * avctx, int flags2); |
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int ff_wma_total_gain_to_bits(int total_gain); |
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int ff_wma_end(AVCodecContext *avctx); |
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unsigned int ff_wma_get_large_val(GetBitContext* gb); |
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int ff_wma_run_level_decode(AVCodecContext* avctx, GetBitContext* gb, |
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VLC *vlc, |
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const float *level_table, const uint16_t *run_table, |
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int version, WMACoef *ptr, int offset, |
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int num_coefs, int block_len, int frame_len_bits, |
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int coef_nb_bits); |
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#endif /* AVCODEC_WMA_H */
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