| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * ALAC (Apple Lossless Audio Codec) decoder | ||
| 3 | * Copyright (c) 2005 David Hammerton | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "libavutil/attributes.h" | ||
| 23 | #include "alacdsp.h" | ||
| 24 | #include "config.h" | ||
| 25 | |||
| 26 | 602 | static void decorrelate_stereo(int32_t *buffer[2], int nb_samples, | |
| 27 | int decorr_shift, int decorr_left_weight) | ||
| 28 | { | ||
| 29 | int i; | ||
| 30 | |||
| 31 |
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2444196 | for (i = 0; i < nb_samples; i++) { |
| 32 | uint32_t a, b; | ||
| 33 | |||
| 34 | 2443594 | a = buffer[0][i]; | |
| 35 | 2443594 | b = buffer[1][i]; | |
| 36 | |||
| 37 | 2443594 | a -= (int)(b * decorr_left_weight) >> decorr_shift; | |
| 38 | 2443594 | b += a; | |
| 39 | |||
| 40 | 2443594 | buffer[0][i] = b; | |
| 41 | 2443594 | buffer[1][i] = a; | |
| 42 | } | ||
| 43 | 602 | } | |
| 44 | |||
| 45 | 1416 | static void append_extra_bits(int32_t *buffer[2], int32_t *extra_bits_buffer[2], | |
| 46 | int extra_bits, int channels, int nb_samples) | ||
| 47 | { | ||
| 48 | int i, ch; | ||
| 49 | |||
| 50 |
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4245 | for (ch = 0; ch < channels; ch++) |
| 51 |
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11548201 | for (i = 0; i < nb_samples; i++) |
| 52 | 11545372 | buffer[ch][i] = ((unsigned)buffer[ch][i] << extra_bits) | extra_bits_buffer[ch][i]; | |
| 53 | 1416 | } | |
| 54 | |||
| 55 | 61 | av_cold void ff_alacdsp_init(ALACDSPContext *c) | |
| 56 | { | ||
| 57 | 61 | c->decorrelate_stereo = decorrelate_stereo; | |
| 58 | 61 | c->append_extra_bits[0] = | |
| 59 | 61 | c->append_extra_bits[1] = append_extra_bits; | |
| 60 | |||
| 61 | #if ARCH_RISCV | ||
| 62 | ff_alacdsp_init_riscv(c); | ||
| 63 | #elif ARCH_X86 | ||
| 64 | 61 | ff_alacdsp_init_x86(c); | |
| 65 | #endif | ||
| 66 | 61 | } | |
| 67 |