150 lines
5.3 KiB
C
150 lines
5.3 KiB
C
/*
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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 WMA_H
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#define WMA_H
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#include "bitstream.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 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 WMADecodeContext {
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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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uint16_t *level_table[2];
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uint16_t *int_table[2];
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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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DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]);
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float max_exponent[MAX_CHANNELS];
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int16_t 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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DECLARE_ALIGNED_16(float, window[BLOCK_MAX_SIZE * 2]);
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MDCTContext mdct_ctx[BLOCK_NB_SIZES];
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float *windows[BLOCK_NB_SIZES];
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DECLARE_ALIGNED_16(FFTSample, mdct_tmp[BLOCK_MAX_SIZE]); /* temporary storage for imdct */
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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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} WMADecodeContext;
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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 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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#endif
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