diff options
-rw-r--r-- | libavcodec/ac3dec.c | 87 | ||||
-rw-r--r-- | libavcodec/ac3dec.h | 122 |
2 files changed, 123 insertions, 86 deletions
diff --git a/libavcodec/ac3dec.c b/libavcodec/ac3dec.c index ad1bb93..17555d0 100644 --- a/libavcodec/ac3dec.c +++ b/libavcodec/ac3dec.c @@ -38,6 +38,7 @@ #include "ac3_parser.h" #include "bitstream.h" #include "dsputil.h" +#include "ac3dec.h" /** Maximum possible frame size when the specification limit is ignored */ #define AC3_MAX_FRAME_SIZE 21695 @@ -121,92 +122,6 @@ static const uint8_t ac3_default_coeffs[8][5][2] = { { { 2, 7 }, { 5, 5 }, { 7, 2 }, { 6, 7 }, { 7, 6 }, }, }; -/* 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; - /** * Symmetrical Dequantization * reference: Section 7.3.3 Expansion of Mantissas for Symmetrical Quantization diff --git a/libavcodec/ac3dec.h b/libavcodec/ac3dec.h new file mode 100644 index 0000000..95d9fbf --- /dev/null +++ b/libavcodec/ac3dec.h @@ -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 */ |