| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Musepack decoder core | ||
| 3 | * Copyright (c) 2006 Konstantin Shishkov | ||
| 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 | /** | ||
| 23 | * @file | ||
| 24 | * Musepack decoder core | ||
| 25 | * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples | ||
| 26 | * divided into 32 subbands. | ||
| 27 | */ | ||
| 28 | |||
| 29 | #include <string.h> | ||
| 30 | #include "libavutil/common.h" | ||
| 31 | #include "mpegaudiodsp.h" | ||
| 32 | |||
| 33 | #include "mpc.h" | ||
| 34 | #include "mpcdata.h" | ||
| 35 | |||
| 36 | /** | ||
| 37 | * Process decoded Musepack data and produce PCM | ||
| 38 | */ | ||
| 39 | 914 | static void mpc_synth(MPCContext *c, int16_t **out, int channels) | |
| 40 | { | ||
| 41 | 914 | int dither_state = 0; | |
| 42 | int i, ch; | ||
| 43 | |||
| 44 |
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2742 | for(ch = 0; ch < channels; ch++){ |
| 45 |
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67636 | for(i = 0; i < SAMPLES_PER_BAND; i++) { |
| 46 | 65808 | ff_mpa_synth_filter_fixed(&c->mpadsp, | |
| 47 | 65808 | c->synth_buf[ch], &(c->synth_buf_offset[ch]), | |
| 48 | ff_mpa_synth_window_fixed, &dither_state, | ||
| 49 | 65808 | out[ch] + 32 * i, 1, | |
| 50 | 65808 | c->sb_samples[ch][i]); | |
| 51 | } | ||
| 52 | } | ||
| 53 | 914 | } | |
| 54 | |||
| 55 | 914 | void ff_mpc_dequantize_and_synth(MPCContext * c, int maxband, int16_t **out, | |
| 56 | int channels) | ||
| 57 | { | ||
| 58 | int i, j, ch; | ||
| 59 | 914 | Band *bands = c->bands; | |
| 60 | int off; | ||
| 61 | float mul; | ||
| 62 | |||
| 63 | /* dequantize */ | ||
| 64 | 914 | memset(c->sb_samples, 0, sizeof(c->sb_samples)); | |
| 65 | 914 | off = 0; | |
| 66 |
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21742 | for(i = 0; i <= maxband; i++, off += SAMPLES_PER_BAND){ |
| 67 |
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62484 | for(ch = 0; ch < 2; ch++){ |
| 68 |
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41656 | if(bands[i].res[ch]){ |
| 69 | 36564 | j = 0; | |
| 70 | 36564 | mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][0] & 0xFF]; | |
| 71 |
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475332 | for(; j < 12; j++) |
| 72 | 438768 | c->sb_samples[ch][j][i] = av_clipf(mul * c->Q[ch][j + off], INT32_MIN, INT32_MAX); | |
| 73 | 36564 | mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][1] & 0xFF]; | |
| 74 |
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475332 | for(; j < 24; j++) |
| 75 | 438768 | c->sb_samples[ch][j][i] = av_clipf(mul * c->Q[ch][j + off], INT32_MIN, INT32_MAX); | |
| 76 | 36564 | mul = (mpc_CC+1)[bands[i].res[ch]] * mpc_SCF[bands[i].scf_idx[ch][2] & 0xFF]; | |
| 77 |
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475332 | for(; j < 36; j++) |
| 78 | 438768 | c->sb_samples[ch][j][i] = av_clipf(mul * c->Q[ch][j + off], INT32_MIN, INT32_MAX); | |
| 79 | } | ||
| 80 | } | ||
| 81 |
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20828 | if(bands[i].msf){ |
| 82 | unsigned t1, t2; | ||
| 83 |
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453250 | for(j = 0; j < SAMPLES_PER_BAND; j++){ |
| 84 | 441000 | t1 = c->sb_samples[0][j][i]; | |
| 85 | 441000 | t2 = c->sb_samples[1][j][i]; | |
| 86 | 441000 | c->sb_samples[0][j][i] = t1 + t2; | |
| 87 | 441000 | c->sb_samples[1][j][i] = t1 - t2; | |
| 88 | } | ||
| 89 | } | ||
| 90 | } | ||
| 91 | |||
| 92 | 914 | mpc_synth(c, out, channels); | |
| 93 | 914 | } | |
| 94 |