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Diffstat (limited to 'ffmpeg1/libavcodec/ac3dsp.h')
| -rw-r--r-- | ffmpeg1/libavcodec/ac3dsp.h | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/ffmpeg1/libavcodec/ac3dsp.h b/ffmpeg1/libavcodec/ac3dsp.h deleted file mode 100644 index bafbc89..0000000 --- a/ffmpeg1/libavcodec/ac3dsp.h +++ /dev/null @@ -1,144 +0,0 @@ -/* - * AC-3 DSP utils - * Copyright (c) 2011 Justin Ruggles - * - * 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 AVCODEC_AC3DSP_H -#define AVCODEC_AC3DSP_H - -#include <stdint.h> - -/** - * Number of mantissa bits written for each bap value. - * bap values with fractional bits are set to 0 and are calculated separately. - */ -extern const uint16_t ff_ac3_bap_bits[16]; - -typedef struct AC3DSPContext { - /** - * Set each encoded exponent in a block to the minimum of itself and the - * exponents in the same frequency bin of up to 5 following blocks. - * @param exp pointer to the start of the current block of exponents. - * constraints: align 16 - * @param num_reuse_blocks number of blocks that will reuse exponents from the current block. - * constraints: range 0 to 5 - * @param nb_coefs number of frequency coefficients. - */ - void (*ac3_exponent_min)(uint8_t *exp, int num_reuse_blocks, int nb_coefs); - - /** - * Calculate the maximum MSB of the absolute value of each element in an - * array of int16_t. - * @param src input array - * constraints: align 16. values must be in range [-32767,32767] - * @param len number of values in the array - * constraints: multiple of 16 greater than 0 - * @return a value with the same MSB as max(abs(src[])) - */ - int (*ac3_max_msb_abs_int16)(const int16_t *src, int len); - - /** - * Left-shift each value in an array of int16_t by a specified amount. - * @param src input array - * constraints: align 16 - * @param len number of values in the array - * constraints: multiple of 32 greater than 0 - * @param shift left shift amount - * constraints: range [0,15] - */ - void (*ac3_lshift_int16)(int16_t *src, unsigned int len, unsigned int shift); - - /** - * Right-shift each value in an array of int32_t by a specified amount. - * @param src input array - * constraints: align 16 - * @param len number of values in the array - * constraints: multiple of 16 greater than 0 - * @param shift right shift amount - * constraints: range [0,31] - */ - void (*ac3_rshift_int32)(int32_t *src, unsigned int len, unsigned int shift); - - /** - * Convert an array of float in range [-1.0,1.0] to int32_t with range - * [-(1<<24),(1<<24)] - * - * @param dst destination array of int32_t. - * constraints: 16-byte aligned - * @param src source array of float. - * constraints: 16-byte aligned - * @param len number of elements to convert. - * constraints: multiple of 32 greater than zero - */ - void (*float_to_fixed24)(int32_t *dst, const float *src, unsigned int len); - - /** - * Calculate bit allocation pointers. - * The SNR is the difference between the masking curve and the signal. AC-3 - * uses this value for each frequency bin to allocate bits. The snroffset - * parameter is a global adjustment to the SNR for all bins. - * - * @param[in] mask masking curve - * @param[in] psd signal power for each frequency bin - * @param[in] start starting bin location - * @param[in] end ending bin location - * @param[in] snr_offset SNR adjustment - * @param[in] floor noise floor - * @param[in] bap_tab look-up table for bit allocation pointers - * @param[out] bap bit allocation pointers - */ - void (*bit_alloc_calc_bap)(int16_t *mask, int16_t *psd, int start, int end, - int snr_offset, int floor, - const uint8_t *bap_tab, uint8_t *bap); - - /** - * Update bap counts using the supplied array of bap. - * - * @param[out] mant_cnt bap counts for 1 block - * @param[in] bap array of bap, pointing to start coef bin - * @param[in] len number of elements to process - */ - void (*update_bap_counts)(uint16_t mant_cnt[16], uint8_t *bap, int len); - - /** - * Calculate the number of bits needed to encode a set of mantissas. - * - * @param[in] mant_cnt bap counts for all blocks - * @return mantissa bit count - */ - int (*compute_mantissa_size)(uint16_t mant_cnt[6][16]); - - void (*extract_exponents)(uint8_t *exp, int32_t *coef, int nb_coefs); - - void (*sum_square_butterfly_int32)(int64_t sum[4], const int32_t *coef0, - const int32_t *coef1, int len); - - void (*sum_square_butterfly_float)(float sum[4], const float *coef0, - const float *coef1, int len); - - void (*downmix)(float **samples, float (*matrix)[2], int out_ch, - int in_ch, int len); -} AC3DSPContext; - -void ff_ac3dsp_init (AC3DSPContext *c, int bit_exact); -void ff_ac3dsp_init_arm(AC3DSPContext *c, int bit_exact); -void ff_ac3dsp_init_x86(AC3DSPContext *c, int bit_exact); -void ff_ac3dsp_init_mips(AC3DSPContext *c, int bit_exact); - -#endif /* AVCODEC_AC3DSP_H */ |