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Diffstat (limited to 'ffmpeg/libavcodec/ac3.h')
| -rw-r--r-- | ffmpeg/libavcodec/ac3.h | 181 |
1 files changed, 0 insertions, 181 deletions
diff --git a/ffmpeg/libavcodec/ac3.h b/ffmpeg/libavcodec/ac3.h deleted file mode 100644 index e609bb5..0000000 --- a/ffmpeg/libavcodec/ac3.h +++ /dev/null @@ -1,181 +0,0 @@ -/* - * Common code between the AC-3 encoder and decoder - * Copyright (c) 2000, 2001, 2002 Fabrice Bellard - * - * 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 - * Common code between the AC-3 encoder and decoder. - */ - -#ifndef AVCODEC_AC3_H -#define AVCODEC_AC3_H - -#define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */ -#define AC3_MAX_CHANNELS 7 /**< maximum number of channels, including coupling channel */ -#define CPL_CH 0 /**< coupling channel index */ - -#define AC3_MAX_COEFS 256 -#define AC3_BLOCK_SIZE 256 -#define AC3_MAX_BLOCKS 6 -#define AC3_FRAME_SIZE (AC3_MAX_BLOCKS * 256) -#define AC3_WINDOW_SIZE (AC3_BLOCK_SIZE * 2) -#define AC3_CRITICAL_BANDS 50 -#define AC3_MAX_CPL_BANDS 18 - -#include "libavutil/opt.h" -#include "avcodec.h" -#include "ac3tab.h" - -/* exponent encoding strategy */ -#define EXP_REUSE 0 -#define EXP_NEW 1 - -#define EXP_D15 1 -#define EXP_D25 2 -#define EXP_D45 3 - -/* pre-defined gain values */ -#define LEVEL_PLUS_3DB 1.4142135623730950 -#define LEVEL_PLUS_1POINT5DB 1.1892071150027209 -#define LEVEL_MINUS_1POINT5DB 0.8408964152537145 -#define LEVEL_MINUS_3DB 0.7071067811865476 -#define LEVEL_MINUS_4POINT5DB 0.5946035575013605 -#define LEVEL_MINUS_6DB 0.5000000000000000 -#define LEVEL_MINUS_9DB 0.3535533905932738 -#define LEVEL_ZERO 0.0000000000000000 -#define LEVEL_ONE 1.0000000000000000 - -/** Delta bit allocation strategy */ -typedef enum { - DBA_REUSE = 0, - DBA_NEW, - DBA_NONE, - DBA_RESERVED -} AC3DeltaStrategy; - -/** Channel mode (audio coding mode) */ -typedef enum { - AC3_CHMODE_DUALMONO = 0, - AC3_CHMODE_MONO, - AC3_CHMODE_STEREO, - AC3_CHMODE_3F, - AC3_CHMODE_2F1R, - AC3_CHMODE_3F1R, - AC3_CHMODE_2F2R, - AC3_CHMODE_3F2R -} AC3ChannelMode; - -typedef struct AC3BitAllocParameters { - int sr_code; - int sr_shift; - int slow_gain, slow_decay, fast_decay, db_per_bit, floor; - int cpl_fast_leak, cpl_slow_leak; -} AC3BitAllocParameters; - -/** - * @struct AC3HeaderInfo - * Coded AC-3 header values up to the lfeon element, plus derived values. - */ -typedef struct AC3HeaderInfo { - /** @name Coded elements - * @{ - */ - uint16_t sync_word; - uint16_t crc1; - uint8_t sr_code; - uint8_t bitstream_id; - uint8_t bitstream_mode; - uint8_t channel_mode; - uint8_t lfe_on; - uint8_t frame_type; - int substreamid; ///< substream identification - int center_mix_level; ///< Center mix level index - int surround_mix_level; ///< Surround mix level index - uint16_t channel_map; - int num_blocks; ///< number of audio blocks - /** @} */ - - /** @name Derived values - * @{ - */ - uint8_t sr_shift; - uint16_t sample_rate; - uint32_t bit_rate; - uint8_t channels; - uint16_t frame_size; - uint64_t channel_layout; - /** @} */ -} AC3HeaderInfo; - -typedef enum { - EAC3_FRAME_TYPE_INDEPENDENT = 0, - EAC3_FRAME_TYPE_DEPENDENT, - EAC3_FRAME_TYPE_AC3_CONVERT, - EAC3_FRAME_TYPE_RESERVED -} EAC3FrameType; - -void ff_ac3_common_init(void); - -/** - * Calculate the log power-spectral density of the input signal. - * This gives a rough estimate of signal power in the frequency domain by using - * the spectral envelope (exponents). The psd is also separately grouped - * into critical bands for use in the calculating the masking curve. - * 128 units in psd = -6 dB. The dbknee parameter in AC3BitAllocParameters - * determines the reference level. - * - * @param[in] exp frequency coefficient exponents - * @param[in] start starting bin location - * @param[in] end ending bin location - * @param[out] psd signal power for each frequency bin - * @param[out] band_psd signal power for each critical band - */ -void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd, - int16_t *band_psd); - -/** - * Calculate the masking curve. - * First, the excitation is calculated using parameters in s and the signal - * power in each critical band. The excitation is compared with a predefined - * hearing threshold table to produce the masking curve. If delta bit - * allocation information is provided, it is used for adjusting the masking - * curve, usually to give a closer match to a better psychoacoustic model. - * - * @param[in] s adjustable bit allocation parameters - * @param[in] band_psd signal power for each critical band - * @param[in] start starting bin location - * @param[in] end ending bin location - * @param[in] fast_gain fast gain (estimated signal-to-mask ratio) - * @param[in] is_lfe whether or not the channel being processed is the LFE - * @param[in] dba_mode delta bit allocation mode (none, reuse, or new) - * @param[in] dba_nsegs number of delta segments - * @param[in] dba_offsets location offsets for each segment - * @param[in] dba_lengths length of each segment - * @param[in] dba_values delta bit allocation for each segment - * @param[out] mask calculated masking curve - * @return returns 0 for success, non-zero for error - */ -int ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd, - int start, int end, int fast_gain, int is_lfe, - int dba_mode, int dba_nsegs, uint8_t *dba_offsets, - uint8_t *dba_lengths, uint8_t *dba_values, - int16_t *mask); - -#endif /* AVCODEC_AC3_H */ |