mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 13697 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Justin Ruggles
17 years ago
parent
30f71adc46
commit
58ce349f0a
2 changed files with 123 additions and 86 deletions
@ -0,0 +1,122 @@ |
||||
/*
|
||||
* Common code between AC3 and E-AC3 decoder |
||||
* Copyright (c) 2007 Bartlomiej Wolowiec <bartek.wolowiec@gmail.com> |
||||
* |
||||
* 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 |
||||
*/ |
||||
|
||||
/**
|
||||
* @file ac3.h |
||||
* Common code between AC3 and E-AC3 decoder. |
||||
*/ |
||||
|
||||
#ifndef FFMPEG_AC3DEC_H |
||||
#define FFMPEG_AC3DEC_H |
||||
|
||||
#include "libavutil/random.h" |
||||
#include "ac3tab.h" |
||||
#include "ac3.h" |
||||
#include "bitstream.h" |
||||
#include "dsputil.h" |
||||
|
||||
/* override ac3.h to include coupling channel */ |
||||
#undef AC3_MAX_CHANNELS |
||||
#define AC3_MAX_CHANNELS 7 |
||||
#define CPL_CH 0 |
||||
|
||||
#define AC3_OUTPUT_LFEON 8 |
||||
|
||||
typedef struct { |
||||
int num_blocks; ///< number of audio blocks
|
||||
int channel_mode; ///< channel mode (acmod)
|
||||
int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags
|
||||
int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags
|
||||
int dither_all; ///< true if all channels are dithered
|
||||
int cpl_in_use; ///< coupling in use
|
||||
int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling
|
||||
int phase_flags_in_use; ///< phase flags in use
|
||||
int phase_flags[18]; ///< phase flags
|
||||
int cpl_band_struct[18]; ///< coupling band structure
|
||||
int num_rematrixing_bands; ///< number of rematrixing bands
|
||||
int rematrixing_flags[4]; ///< rematrixing flags
|
||||
int exp_strategy[AC3_MAX_CHANNELS]; ///< exponent strategies
|
||||
int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets
|
||||
int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values (signal-to-mask ratio)
|
||||
int dba_mode[AC3_MAX_CHANNELS]; ///< delta bit allocation mode
|
||||
int dba_nsegs[AC3_MAX_CHANNELS]; ///< number of delta segments
|
||||
uint8_t dba_offsets[AC3_MAX_CHANNELS][8]; ///< delta segment offsets
|
||||
uint8_t dba_lengths[AC3_MAX_CHANNELS][8]; ///< delta segment lengths
|
||||
uint8_t dba_values[AC3_MAX_CHANNELS][8]; ///< delta values for each segment
|
||||
|
||||
int sample_rate; ///< sample frequency, in Hz
|
||||
int bit_rate; ///< stream bit rate, in bits-per-second
|
||||
int frame_type; ///< frame type (strmtyp)
|
||||
int substreamid; ///< substream identification
|
||||
int frame_size; ///< current frame size, in bytes
|
||||
|
||||
int channels; ///< number of total channels
|
||||
int fbw_channels; ///< number of full-bandwidth channels
|
||||
int lfe_on; ///< lfe channel in use
|
||||
int lfe_ch; ///< index of LFE channel
|
||||
int output_mode; ///< output channel configuration
|
||||
int out_channels; ///< number of output channels
|
||||
|
||||
int center_mix_level; ///< Center mix level index
|
||||
int surround_mix_level; ///< Surround mix level index
|
||||
float downmix_coeffs[AC3_MAX_CHANNELS][2]; ///< stereo downmix coefficients
|
||||
float downmix_coeff_adjust[2]; ///< adjustment needed for each output channel when downmixing
|
||||
float dynamic_range[2]; ///< dynamic range
|
||||
int cpl_coords[AC3_MAX_CHANNELS][18]; ///< coupling coordinates
|
||||
int num_cpl_bands; ///< number of coupling bands
|
||||
int num_cpl_subbands; ///< number of coupling sub bands
|
||||
int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin
|
||||
int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin
|
||||
AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters
|
||||
|
||||
int num_exp_groups[AC3_MAX_CHANNELS]; ///< Number of exponent groups
|
||||
int8_t dexps[AC3_MAX_CHANNELS][256]; ///< decoded exponents
|
||||
uint8_t bap[AC3_MAX_CHANNELS][256]; ///< bit allocation pointers
|
||||
int16_t psd[AC3_MAX_CHANNELS][256]; ///< scaled exponents
|
||||
int16_t band_psd[AC3_MAX_CHANNELS][50]; ///< interpolated exponents
|
||||
int16_t mask[AC3_MAX_CHANNELS][50]; ///< masking curve values
|
||||
|
||||
int fixed_coeffs[AC3_MAX_CHANNELS][256]; ///> fixed-point transform coefficients
|
||||
DECLARE_ALIGNED_16(float, transform_coeffs[AC3_MAX_CHANNELS][256]); ///< transform coefficients
|
||||
int downmixed; ///< indicates if coeffs are currently downmixed
|
||||
|
||||
/* For IMDCT. */ |
||||
MDCTContext imdct_512; ///< for 512 sample IMDCT
|
||||
MDCTContext imdct_256; ///< for 256 sample IMDCT
|
||||
DSPContext dsp; ///< for optimization
|
||||
float add_bias; ///< offset for float_to_int16 conversion
|
||||
float mul_bias; ///< scaling for float_to_int16 conversion
|
||||
|
||||
DECLARE_ALIGNED_16(float, output[AC3_MAX_CHANNELS][256]); ///< output after imdct transform and windowing
|
||||
DECLARE_ALIGNED_16(short, int_output[AC3_MAX_CHANNELS-1][256]); ///< final 16-bit integer output
|
||||
DECLARE_ALIGNED_16(float, delay[AC3_MAX_CHANNELS][256]); ///< delay - added to the next block
|
||||
DECLARE_ALIGNED_16(float, tmp_imdct[256]); ///< temporary storage for imdct transform
|
||||
DECLARE_ALIGNED_16(float, tmp_output[512]); ///< temporary storage for output before windowing
|
||||
DECLARE_ALIGNED_16(float, window[256]); ///< window coefficients
|
||||
|
||||
/* Miscellaneous. */ |
||||
GetBitContext gbc; ///< bitstream reader
|
||||
AVRandomState dith_state; ///< for dither generation
|
||||
AVCodecContext *avctx; ///< parent context
|
||||
uint8_t *input_buffer; ///< temp buffer to prevent overread
|
||||
} AC3DecodeContext; |
||||
|
||||
#endif /* FFMPEG_AC3DEC_H */ |
||||
Loading…
Reference in new issue