X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fac3dec.h;h=e4d443c9a8e438f0281ddbfdfc3c61a42fe4ba69;hb=bfe1cd80ebeab58cbc1c91ac766a96fce8e4ec1e;hp=196541ac493dcdc533d4695ab6f0242630ffc184;hpb=2288596074ce31cc03b1f2bee00b51206b1a3334;p=ffmpeg diff --git a/libavcodec/ac3dec.h b/libavcodec/ac3dec.h index 196541ac493..e4d443c9a8e 100644 --- a/libavcodec/ac3dec.h +++ b/libavcodec/ac3dec.h @@ -1,150 +1,243 @@ /* - * Common code between AC3 and E-AC3 decoder + * Common code between the AC-3 and E-AC-3 decoders * Copyright (c) 2007 Bartlomiej Wolowiec * - * This file is part of FFmpeg. + * This file is part of Libav. * - * FFmpeg is free software; you can redistribute it and/or + * Libav 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, + * Libav 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 + * License along with Libav; 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. + * @file + * Common code between the AC-3 and E-AC-3 decoders. + * + * Summary of MDCT Coefficient Grouping: + * The individual MDCT coefficient indices are often referred to in the + * (E-)AC-3 specification as frequency bins. These bins are grouped together + * into subbands of 12 coefficients each. The subbands are grouped together + * into bands as defined in the bitstream by the band structures, which + * determine the number of bands and the size of each band. The full spectrum + * of 256 frequency bins is divided into 1 DC bin + 21 subbands = 253 bins. + * This system of grouping coefficients is used for channel bandwidth, stereo + * rematrixing, channel coupling, enhanced coupling, and spectral extension. + * + * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+ + * |1| |12| | [12|12|12|12] | | | | | | | | | | | | |3| + * +-+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+-+ + * ~~~ ~~~~ ~~~~~~~~~~~~~ ~~~ + * | | | | + * | | | 3 unused frequency bins--+ + * | | | + * | | +--1 band containing 4 subbands + * | | + * | +--1 subband of 12 frequency bins + * | + * +--DC frequency bin */ -#ifndef FFMPEG_AC3DEC_H -#define FFMPEG_AC3DEC_H +#ifndef AVCODEC_AC3DEC_H +#define AVCODEC_AC3DEC_H -#include "libavutil/random.h" -#include "ac3tab.h" +#include "libavutil/float_dsp.h" +#include "libavutil/lfg.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 +#include "ac3dsp.h" +#include "bswapdsp.h" +#include "get_bits.h" +#include "fft.h" +#include "fmtconvert.h" #define AC3_OUTPUT_LFEON 8 -typedef struct { +#define SPX_MAX_BANDS 17 + +/** Large enough for maximum possible frame size when the specification limit is ignored */ +#define AC3_FRAME_BUFFER_SIZE 32768 + +typedef struct AC3DecodeContext { + AVClass *class; ///< class for AVOptions AVCodecContext *avctx; ///< parent context GetBitContext gbc; ///< bitstream reader - uint8_t *input_buffer; ///< temp buffer to prevent overread -///@defgroup bsi bit stream information +///@name Bit stream information ///@{ - int frame_type; ///< frame type (strmtyp) + int frame_type; ///< frame type (strmtyp) int substreamid; ///< substream identification int frame_size; ///< current frame size, in bytes int bit_rate; ///< stream bit rate, in bits-per-second int sample_rate; ///< sample frequency, in Hz int num_blocks; ///< number of audio blocks - int channel_mode; ///< channel mode (acmod) + int bitstream_id; ///< bitstream id (bsid) + int bitstream_mode; ///< bitstream mode (bsmod) + int channel_mode; ///< channel mode (acmod) int lfe_on; ///< lfe channel in use + int channel_map; ///< custom channel map + int preferred_downmix; ///< Preferred 2-channel downmix mode (dmixmod) int center_mix_level; ///< Center mix level index + int center_mix_level_ltrt; ///< Center mix level index for Lt/Rt (ltrtcmixlev) int surround_mix_level; ///< Surround mix level index + int surround_mix_level_ltrt; ///< Surround mix level index for Lt/Rt (ltrtsurmixlev) + int lfe_mix_level_exists; ///< indicates if lfemixlevcod is specified (lfemixlevcode) + int lfe_mix_level; ///< LFE mix level index (lfemixlevcod) + int eac3; ///< indicates if current frame is E-AC-3 + int dolby_surround_mode; ///< dolby surround mode (dsurmod) + int dolby_surround_ex_mode; ///< dolby surround ex mode (dsurexmod) + int dolby_headphone_mode; ///< dolby headphone mode (dheadphonmod) +///@} + +///@name Frame syntax parameters + int snr_offset_strategy; ///< SNR offset strategy (snroffststr) + int block_switch_syntax; ///< block switch syntax enabled (blkswe) + int dither_flag_syntax; ///< dither flag syntax enabled (dithflage) + int bit_allocation_syntax; ///< bit allocation model syntax enabled (bamode) + int fast_gain_syntax; ///< fast gain codes enabled (frmfgaincode) + int dba_syntax; ///< delta bit allocation syntax enabled (dbaflde) + int skip_syntax; ///< skip field syntax enabled (skipflde) + ///@} + +///@name Standard coupling + int cpl_in_use[AC3_MAX_BLOCKS]; ///< coupling in use (cplinu) + int cpl_strategy_exists[AC3_MAX_BLOCKS];///< coupling strategy exists (cplstre) + int channel_in_cpl[AC3_MAX_CHANNELS]; ///< channel in coupling (chincpl) + int phase_flags_in_use; ///< phase flags in use (phsflginu) + int phase_flags[AC3_MAX_CPL_BANDS]; ///< phase flags (phsflg) + int num_cpl_bands; ///< number of coupling bands (ncplbnd) + uint8_t cpl_band_sizes[AC3_MAX_CPL_BANDS]; ///< number of coeffs in each coupling band + int firstchincpl; ///< first channel in coupling + int first_cpl_coords[AC3_MAX_CHANNELS]; ///< first coupling coordinates states (firstcplcos) + int cpl_coords[AC3_MAX_CHANNELS][AC3_MAX_CPL_BANDS]; ///< coupling coordinates (cplco) +///@} + +///@name Spectral extension +///@{ + int spx_in_use; ///< spectral extension in use (spxinu) + uint8_t channel_uses_spx[AC3_MAX_CHANNELS]; ///< channel uses spectral extension (chinspx) + int8_t spx_atten_code[AC3_MAX_CHANNELS]; ///< spx attenuation code (spxattencod) + int spx_src_start_freq; ///< spx start frequency bin + int spx_dst_end_freq; ///< spx end frequency bin + int spx_dst_start_freq; ///< spx starting frequency bin for copying (copystartmant) + ///< the copy region ends at the start of the spx region. + int num_spx_bands; ///< number of spx bands (nspxbnds) + uint8_t spx_band_sizes[SPX_MAX_BANDS]; ///< number of bins in each spx band + uint8_t first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states (firstspxcos) + float spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor (nblendfact) + float spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS];///< spx signal blending factor (sblendfact) ///@} -///@defgroup cpl standard coupling - 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 num_cpl_subbands; ///< number of coupling sub bands - int num_cpl_bands; ///< number of coupling bands - int cpl_band_struct[18]; ///< coupling band structure - int cpl_coords[AC3_MAX_CHANNELS][18]; ///< coupling coordinates +///@name Adaptive hybrid transform + int channel_uses_aht[AC3_MAX_CHANNELS]; ///< channel AHT in use (chahtinu) + int pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][AC3_MAX_BLOCKS]; ///< pre-IDCT mantissas ///@} -///@defgroup channel channel +///@name Channel int fbw_channels; ///< number of full-bandwidth channels int channels; ///< number of total channels int lfe_ch; ///< index of LFE channel float downmix_coeffs[AC3_MAX_CHANNELS][2]; ///< stereo downmix coefficients - float downmix_coeff_adjust[2]; ///< adjustment needed for each output channel when downmixing int downmixed; ///< indicates if coeffs are currently downmixed int output_mode; ///< output channel configuration int out_channels; ///< number of output channels ///@} -///@defgroup dynrng dynamic range +///@name Dynamic range float dynamic_range[2]; ///< dynamic range + float drc_scale; ///< percentage of dynamic range compression to be applied ///@} -///@defgroup bandwidth bandwidth - int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin - int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin +///@name Bandwidth + int start_freq[AC3_MAX_CHANNELS]; ///< start frequency bin (strtmant) + int end_freq[AC3_MAX_CHANNELS]; ///< end frequency bin (endmant) ///@} -///@defgroup rematrixing rematrixing - int num_rematrixing_bands; ///< number of rematrixing bands - int rematrixing_flags[4]; ///< rematrixing flags +///@name Rematrixing + int num_rematrixing_bands; ///< number of rematrixing bands (nrematbnd) + int rematrixing_flags[4]; ///< rematrixing flags (rematflg) ///@} -///@defgroup exponents exponents - int num_exp_groups[AC3_MAX_CHANNELS]; ///< Number of exponent groups - int8_t dexps[AC3_MAX_CHANNELS][256]; ///< decoded exponents - int exp_strategy[AC3_MAX_CHANNELS]; ///< exponent strategies +///@name Exponents + int num_exp_groups[AC3_MAX_CHANNELS]; ///< Number of exponent groups (nexpgrp) + int8_t dexps[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< decoded exponents + int exp_strategy[AC3_MAX_BLOCKS][AC3_MAX_CHANNELS]; ///< exponent strategies (expstr) ///@} -///@defgroup bitalloc bit allocation - AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters - int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets - int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values (signal-to-mask ratio) - 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 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 +///@name Bit allocation + AC3BitAllocParameters bit_alloc_params; ///< bit allocation parameters + int first_cpl_leak; ///< first coupling leak state (firstcplleak) + int snr_offset[AC3_MAX_CHANNELS]; ///< signal-to-noise ratio offsets (snroffst) + int fast_gain[AC3_MAX_CHANNELS]; ///< fast gain values/SMR's (fgain) + uint8_t bap[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< bit allocation pointers + int16_t psd[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< scaled exponents + int16_t band_psd[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< interpolated exponents + int16_t mask[AC3_MAX_CHANNELS][AC3_CRITICAL_BANDS]; ///< masking curve values + 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 ///@} -///@defgroup dithering zero-mantissa dithering - int dither_all; ///< true if all channels are dithered - int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags - AVRandomState dith_state; ///< for dither generation +///@name Zero-mantissa dithering + int dither_flag[AC3_MAX_CHANNELS]; ///< dither flags (dithflg) + AVLFG dith_state; ///< for dither generation ///@} -///@defgroup imdct IMDCT - int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags - MDCTContext imdct_512; ///< for 512 sample IMDCT - MDCTContext imdct_256; ///< for 256 sample IMDCT +///@name IMDCT + int block_switch[AC3_MAX_CHANNELS]; ///< block switch flags (blksw) + FFTContext imdct_512; ///< for 512 sample IMDCT + FFTContext imdct_256; ///< for 256 sample IMDCT ///@} -///@defgroup opt optimization - DSPContext dsp; ///< for optimization - float add_bias; ///< offset for float_to_int16 conversion - float mul_bias; ///< scaling for float_to_int16 conversion +///@name Optimization + BswapDSPContext bdsp; + AVFloatDSPContext fdsp; + AC3DSPContext ac3dsp; + FmtConvertContext fmt_conv; ///< optimized conversion functions ///@} - int fixed_coeffs[AC3_MAX_CHANNELS][256]; ///> fixed-point transform coefficients - -///@defgroup arrays aligned arrays - DECLARE_ALIGNED_16(float, transform_coeffs[AC3_MAX_CHANNELS][256]); ///< transform coefficients - DECLARE_ALIGNED_16(float, delay[AC3_MAX_CHANNELS][256]); ///< delay - added to the next block - DECLARE_ALIGNED_16(float, window[256]); ///< window coefficients - DECLARE_ALIGNED_16(float, tmp_output[512]); ///< temporary storage for output before windowing - DECLARE_ALIGNED_16(float, tmp_imdct[256]); ///< temporary storage for imdct transform - 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 + float *outptr[AC3_MAX_CHANNELS]; + float *xcfptr[AC3_MAX_CHANNELS]; + float *dlyptr[AC3_MAX_CHANNELS]; + +///@name Aligned arrays + DECLARE_ALIGNED(16, int32_t, fixed_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< fixed-point transform coefficients + DECLARE_ALIGNED(32, float, transform_coeffs)[AC3_MAX_CHANNELS][AC3_MAX_COEFS]; ///< transform coefficients + DECLARE_ALIGNED(32, float, delay)[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< delay - added to the next block + DECLARE_ALIGNED(32, float, window)[AC3_BLOCK_SIZE]; ///< window coefficients + DECLARE_ALIGNED(32, float, tmp_output)[AC3_BLOCK_SIZE]; ///< temporary storage for output before windowing + DECLARE_ALIGNED(32, float, output)[AC3_MAX_CHANNELS][AC3_BLOCK_SIZE]; ///< output after imdct transform and windowing + DECLARE_ALIGNED(32, uint8_t, input_buffer)[AC3_FRAME_BUFFER_SIZE + AV_INPUT_BUFFER_PADDING_SIZE]; ///< temp buffer to prevent overread ///@} } AC3DecodeContext; -#endif /* FFMPEG_AC3DEC_H */ +/** + * Parse the E-AC-3 frame header. + * This parses both the bit stream info and audio frame header. + */ +int ff_eac3_parse_header(AC3DecodeContext *s); + +/** + * Decode mantissas in a single channel for the entire frame. + * This is used when AHT mode is enabled. + */ +void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch); + +/** + * Apply spectral extension to each channel by copying lower frequency + * coefficients to higher frequency bins and applying side information to + * approximate the original high frequency signal. + */ +void ff_eac3_apply_spectral_extension(AC3DecodeContext *s); + +#endif /* AVCODEC_AC3DEC_H */