From 59686073043b9bb5e186521fe001708a03412d99 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 6 Feb 2007 20:19:04 +0000 Subject: wma encoder Originally committed as revision 7855 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/wma.h | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 149 insertions(+) create mode 100644 libavcodec/wma.h (limited to 'libavcodec/wma.h') diff --git a/libavcodec/wma.h b/libavcodec/wma.h new file mode 100644 index 0000000000..1db6d53d88 --- /dev/null +++ b/libavcodec/wma.h @@ -0,0 +1,149 @@ +/* + * 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 WMA_H +#define WMA_H + +#include "bitstream.h" +#include "dsputil.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 16384 + +#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 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 WMADecodeContext { + GetBitContext gb; + PutBitContext pb; + int sample_rate; + int nb_channels; + int bit_rate; + int version; /* 1 = 0x160 (WMAV1), 2 = 0x161 (WMAV2) */ + int block_align; + 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]; + uint16_t *level_table[2]; + uint16_t *int_table[2]; + 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 */ + DECLARE_ALIGNED_16(float, exponents[MAX_CHANNELS][BLOCK_MAX_SIZE]); + float max_exponent[MAX_CHANNELS]; + int16_t coefs1[MAX_CHANNELS][BLOCK_MAX_SIZE]; + DECLARE_ALIGNED_16(float, coefs[MAX_CHANNELS][BLOCK_MAX_SIZE]); + DECLARE_ALIGNED_16(FFTSample, output[BLOCK_MAX_SIZE * 2]); + DECLARE_ALIGNED_16(float, window[BLOCK_MAX_SIZE * 2]); + MDCTContext mdct_ctx[BLOCK_NB_SIZES]; + float *windows[BLOCK_NB_SIZES]; + DECLARE_ALIGNED_16(FFTSample, mdct_tmp[BLOCK_MAX_SIZE]); /* temporary storage for imdct */ + /* output buffer for one frame and the last for IMDCT windowing */ + DECLARE_ALIGNED_16(float, frame_out[MAX_CHANNELS][BLOCK_MAX_SIZE * 2]); + /* last frame info */ + uint8_t last_superframe[MAX_CODED_SUPERFRAME_SIZE + 4]; /* padding added */ + int last_bitoffset; + int last_superframe_len; + 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)]; + DSPContext dsp; + +#ifdef TRACE + int frame_count; +#endif +} WMADecodeContext; + +extern const uint16_t ff_wma_hgain_huffcodes[37]; +extern const uint8_t ff_wma_hgain_huffbits[37]; +extern const float ff_wma_lsp_codebook[NB_LSP_COEFS][16]; +extern const uint32_t ff_wma_scale_huffcodes[121]; +extern const uint8_t ff_wma_scale_huffbits[121]; + +int ff_wma_init(AVCodecContext * avctx, int flags2); +int ff_wma_total_gain_to_bits(int total_gain); +int ff_wma_end(AVCodecContext *avctx); + +#endif -- cgit v1.2.3