adxenc: avoid stereo deinterleaving
[libav.git] / libavcodec / adxenc.c
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1/*
2 * ADX ADPCM codecs
3 * Copyright (c) 2001,2003 BERO
4 *
2912e87a 5 * This file is part of Libav.
c31dea61 6 *
2912e87a 7 * Libav is free software; you can redistribute it and/or
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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 *
2912e87a 12 * Libav is distributed in the hope that it will be useful,
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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
2912e87a 18 * License along with Libav; if not, write to the Free Software
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19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
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21
22#include "libavutil/intreadwrite.h"
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23#include "avcodec.h"
24#include "adx.h"
99423853 25#include "put_bits.h"
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26
27/**
ba87f080 28 * @file
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29 * SEGA CRI adx codecs.
30 *
31 * Reference documents:
32 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
33 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
34 */
35
25edfc88 36static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
61366821 37 ADXChannelState *prev, int channels)
c31dea61 38{
99423853 39 PutBitContext pb;
c31dea61 40 int scale;
61366821 41 int i, j;
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42 int s0, s1, s2, d;
43 int max = 0;
44 int min = 0;
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45 int data[32];
46
47 s1 = prev->s1;
48 s2 = prev->s2;
61366821 49 for (i = 0, j = 0; j < 32; i += channels, j++) {
c31dea61 50 s0 = wav[i];
b237248e 51 d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
61366821 52 data[j] = d;
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53 if (max < d)
54 max = d;
55 if (min > d)
56 min = d;
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57 s2 = s1;
58 s1 = s0;
59 }
60 prev->s1 = s1;
61 prev->s2 = s2;
62
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63 if (max == 0 && min == 0) {
64 memset(adx, 0, 18);
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65 return;
66 }
67
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68 if (max / 7 > -min / 8)
69 scale = max / 7;
70 else
71 scale = -min / 8;
c31dea61 72
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73 if (scale == 0)
74 scale = 1;
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75
76 AV_WB16(adx, scale);
77
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78 init_put_bits(&pb, adx + 2, 16);
79 for (i = 0; i < 32; i++)
a85ab8ad 80 put_sbits(&pb, 4, av_clip(data[i] / scale, -8, 7));
99423853 81 flush_put_bits(&pb);
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82}
83
25edfc88 84static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
c31dea61 85{
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86 ADXContext *c = avctx->priv_data;
87
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88 AV_WB32(buf + 0x00, 0x80000000 | 0x20);
89 AV_WB32(buf + 0x04, 0x03120400 | avctx->channels);
90 AV_WB32(buf + 0x08, avctx->sample_rate);
91 AV_WB32(buf + 0x0c, 0);
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92 AV_WB16(buf + 0x10, c->cutoff);
93 AV_WB32(buf + 0x12, 0x03000000);
94 AV_WB32(buf + 0x16, 0x00000000);
95 AV_WB32(buf + 0x1a, 0x00000000);
96 memcpy (buf + 0x1e, "(c)CRI", 6);
a85ab8ad 97 return 0x20 + 4;
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98}
99
98a6fff9 100static av_cold int adx_encode_init(AVCodecContext *avctx)
c31dea61 101{
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102 ADXContext *c = avctx->priv_data;
103
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104 if (avctx->channels > 2) {
105 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
106 return AVERROR(EINVAL);
107 }
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108 avctx->frame_size = 32;
109
a85ab8ad 110 avctx->coded_frame = avcodec_alloc_frame();
c31dea61 111
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112 /* the cutoff can be adjusted, but this seems to work pretty well */
113 c->cutoff = 500;
114 ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
115
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116 return 0;
117}
118
98a6fff9 119static av_cold int adx_encode_close(AVCodecContext *avctx)
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120{
121 av_freep(&avctx->coded_frame);
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122 return 0;
123}
124
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125static int adx_encode_frame(AVCodecContext *avctx, uint8_t *frame,
126 int buf_size, void *data)
c31dea61 127{
a85ab8ad 128 ADXContext *c = avctx->priv_data;
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129 const int16_t *samples = data;
130 uint8_t *dst = frame;
131 int rest = avctx->frame_size;
c31dea61 132
c31dea61 133 if (!c->header_parsed) {
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134 int hdrsize = adx_encode_header(avctx, dst, buf_size);
135 dst += hdrsize;
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136 c->header_parsed = 1;
137 }
138
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139 if (avctx->channels == 1) {
140 while (rest >= 32) {
61366821 141 adx_encode(c, dst, samples, c->prev, avctx->channels);
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142 dst += 18;
143 samples += 32;
144 rest -= 32;
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145 }
146 } else {
a85ab8ad 147 while (rest >= 32*2) {
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148 adx_encode(c, dst, samples, c->prev, avctx->channels);
149 adx_encode(c, dst + 18, samples + 1, c->prev + 1, avctx->channels);
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150 dst += 18*2;
151 samples += 32*2;
152 rest -= 32*2;
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153 }
154 }
a85ab8ad 155 return dst - frame;
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156}
157
d36beb3f 158AVCodec ff_adpcm_adx_encoder = {
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159 .name = "adpcm_adx",
160 .type = AVMEDIA_TYPE_AUDIO,
161 .id = CODEC_ID_ADPCM_ADX,
162 .priv_data_size = sizeof(ADXContext),
163 .init = adx_encode_init,
164 .encode = adx_encode_frame,
165 .close = adx_encode_close,
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166 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
167 AV_SAMPLE_FMT_NONE },
168 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
c31dea61 169};