166 lines
6.3 KiB
C
166 lines
6.3 KiB
C
/*
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* WMA compatible codec
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* Copyright (c) 2002-2007 The Libav Project
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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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#include "fft.h"
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#include "fmtconvert.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(32, 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(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE];
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DECLARE_ALIGNED(32, 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(32, 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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FmtConvertContext fmt_conv;
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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_critical_freqs[25];
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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_aac_scalefactor_code[121];
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extern const uint8_t ff_aac_scalefactor_bits[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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