00001 /* 00002 * WMA compatible codec 00003 * Copyright (c) 2002-2007 The FFmpeg Project 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #ifndef AVCODEC_WMA_H 00023 #define AVCODEC_WMA_H 00024 00025 #include "bitstream.h" 00026 #include "dsputil.h" 00027 00028 /* size of blocks */ 00029 #define BLOCK_MIN_BITS 7 00030 #define BLOCK_MAX_BITS 11 00031 #define BLOCK_MAX_SIZE (1 << BLOCK_MAX_BITS) 00032 00033 #define BLOCK_NB_SIZES (BLOCK_MAX_BITS - BLOCK_MIN_BITS + 1) 00034 00035 /* XXX: find exact max size */ 00036 #define HIGH_BAND_MAX_SIZE 16 00037 00038 #define NB_LSP_COEFS 10 00039 00040 /* XXX: is it a suitable value ? */ 00041 #define MAX_CODED_SUPERFRAME_SIZE 16384 00042 00043 #define MAX_CHANNELS 2 00044 00045 #define NOISE_TAB_SIZE 8192 00046 00047 #define LSP_POW_BITS 7 00048 00049 //FIXME should be in wmadec 00050 #define VLCBITS 9 00051 #define VLCMAX ((22+VLCBITS-1)/VLCBITS) 00052 00053 typedef struct CoefVLCTable { 00054 int n; 00055 int max_level; 00056 const uint32_t *huffcodes; 00057 const uint8_t *huffbits; 00058 const uint16_t *levels; 00059 } CoefVLCTable; 00060 00061 typedef struct WMACodecContext { 00062 AVCodecContext* avctx; 00063 GetBitContext gb; 00064 PutBitContext pb; 00065 int sample_rate; 00066 int nb_channels; 00067 int bit_rate; 00068 int version; 00069 int block_align; 00070 int use_bit_reservoir; 00071 int use_variable_block_len; 00072 int use_exp_vlc; 00073 int use_noise_coding; 00074 int byte_offset_bits; 00075 VLC exp_vlc; 00076 int exponent_sizes[BLOCK_NB_SIZES]; 00077 uint16_t exponent_bands[BLOCK_NB_SIZES][25]; 00078 int high_band_start[BLOCK_NB_SIZES]; 00079 int coefs_start; 00080 int coefs_end[BLOCK_NB_SIZES]; 00081 int exponent_high_sizes[BLOCK_NB_SIZES]; 00082 int exponent_high_bands[BLOCK_NB_SIZES][HIGH_BAND_MAX_SIZE]; 00083 VLC hgain_vlc; 00084 00085 /* coded values in high bands */ 00086 int high_band_coded[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 00087 int high_band_values[MAX_CHANNELS][HIGH_BAND_MAX_SIZE]; 00088 00089 /* there are two possible tables for spectral coefficients */ 00090 //FIXME the following 3 tables should be shared between decoders 00091 VLC coef_vlc[2]; 00092 uint16_t *run_table[2]; 00093 uint16_t *level_table[2]; 00094 uint16_t *int_table[2]; 00095 const CoefVLCTable *coef_vlcs[2]; 00096 /* frame info */ 00097 int frame_len; 00098 int frame_len_bits; 00099 int nb_block_sizes; 00100 /* block info */ 00101 int reset_block_lengths; 00102 int block_len_bits; 00103 int next_block_len_bits; 00104 int prev_block_len_bits; 00105 int block_len; 00106 int block_num; 00107 int block_pos; 00108 uint8_t ms_stereo; 00109 uint8_t channel_coded[MAX_CHANNELS]; 00110 int exponents_bsize[MAX_CHANNELS]; 00111 DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]); 00112 float max_exponent[MAX_CHANNELS]; 00113 int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; 00114 DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]); 00115 DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]); 00116 MDCTContext mdct_ctx[BLOCK_NB_SIZES]; 00117 float *windows[BLOCK_NB_SIZES]; 00118 /* output buffer for one frame and the last for IMDCT windowing */ 00119 DECLARE_ALIGNED_16(float, frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]); 00120 /* last frame info */ 00121 uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */ 00122 int last_bitoffset; 00123 int last_superframe_len; 00124 float noise_table[NOISE_TAB_SIZE]; 00125 int noise_index; 00126 float noise_mult; /* XXX: suppress that and integrate it in the noise array */ 00127 /* lsp_to_curve tables */ 00128 float lsp_cos_table[BLOCK_MAX_SIZE]; 00129 float lsp_pow_e_table[256]; 00130 float lsp_pow_m_table1[(1 << LSP_POW_BITS)]; 00131 float lsp_pow_m_table2[(1 << LSP_POW_BITS)]; 00132 DSPContext dsp; 00133 00134 #ifdef TRACE 00135 int frame_count; 00136 #endif 00137 } WMACodecContext; 00138 00139 extern const uint16_t ff_wma_hgain_huffcodes[37]; 00140 extern const uint8_t ff_wma_hgain_huffbits[37]; 00141 extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; 00142 extern const uint32_t ff_wma_scale_huffcodes[121]; 00143 extern const uint8_t ff_wma_scale_huffbits[121]; 00144 00145 int ff_wma_init(AVCodecContext * avctx, int flags2); 00146 int ff_wma_total_gain_to_bits(int total_gain); 00147 int ff_wma_end(AVCodecContext *avctx); 00148 00149 #endif /* AVCODEC_WMA_H */
1.5.8