| /* |
| * 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 "libavutil/float_dsp.h" |
| #include "libavutil/mem_internal.h" |
| |
| #include "avcodec.h" |
| #include "fft.h" |
| #include "get_bits.h" |
| #include "put_bits.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 32768 |
| |
| #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 version; ///< 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) |
| 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]; |
| float *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(32, float, exponents)[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
| float max_exponent[MAX_CHANNELS]; |
| WMACoef coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
| DECLARE_ALIGNED(32, float, coefs)[MAX_CHANNELS][BLOCK_MAX_SIZE]; |
| DECLARE_ALIGNED(32, FFTSample, output)[BLOCK_MAX_SIZE * 2]; |
| FFTContext mdct_ctx[BLOCK_NB_SIZES]; |
| const float *windows[BLOCK_NB_SIZES]; |
| /* output buffer for one frame and the last for IMDCT windowing */ |
| DECLARE_ALIGNED(32, float, frame_out)[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]; |
| /* last frame info */ |
| uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; /* padding added */ |
| int last_bitoffset; |
| int last_superframe_len; |
| int exponents_initialized[MAX_CHANNELS]; |
| 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)]; |
| AVFloatDSPContext *fdsp; |
| |
| #ifdef TRACE |
| int frame_count; |
| #endif /* TRACE */ |
| } WMACodecContext; |
| |
| extern const uint8_t ff_wma_hgain_hufftab[37][2]; |
| extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; |
| extern const uint32_t ff_aac_scalefactor_code[121]; |
| extern const uint8_t ff_aac_scalefactor_bits[121]; |
| |
| av_warn_unused_result |
| int ff_wma_init(AVCodecContext *avctx, int flags2); |
| |
| int ff_wma_total_gain_to_bits(int total_gain); |
| int ff_wma_end(AVCodecContext *avctx); |
| unsigned int ff_wma_get_large_val(GetBitContext *gb); |
| int ff_wma_run_level_decode(AVCodecContext *avctx, GetBitContext *gb, |
| VLC *vlc, const float *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 */ |
