7225c3159d4ee263f648f6de784177121f255a8e
[libav.git] / libavcodec / adxenc.c
1 /*
2 * ADX ADPCM codecs
3 * Copyright (c) 2001,2003 BERO
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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/intreadwrite.h"
23 #include "avcodec.h"
24 #include "adx.h"
25
26 /**
27 * @file
28 * SEGA CRI adx codecs.
29 *
30 * Reference documents:
31 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
32 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
33 */
34
35 /* 18 bytes <-> 32 samples */
36
37 static void adx_encode(unsigned char *adx,const short *wav,
38 ADXChannelState *prev)
39 {
40 int scale;
41 int i;
42 int s0,s1,s2,d;
43 int max=0;
44 int min=0;
45 int data[32];
46
47 s1 = prev->s1;
48 s2 = prev->s2;
49 for(i=0;i<32;i++) {
50 s0 = wav[i];
51 d = ((s0 << COEFF_BITS) - COEFF1 * s1 + COEFF2 * s2) >> COEFF_BITS;
52 data[i]=d;
53 if (max<d) max=d;
54 if (min>d) min=d;
55 s2 = s1;
56 s1 = s0;
57 }
58 prev->s1 = s1;
59 prev->s2 = s2;
60
61 /* -8..+7 */
62
63 if (max==0 && min==0) {
64 memset(adx,0,18);
65 return;
66 }
67
68 if (max/7>-min/8) scale = max/7;
69 else scale = -min/8;
70
71 if (scale==0) scale=1;
72
73 AV_WB16(adx, scale);
74
75 for(i=0;i<16;i++) {
76 adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
77 }
78 }
79
80 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
81 {
82 #if 0
83 struct {
84 uint32_t offset; /* 0x80000000 + sample start - 4 */
85 unsigned char unknown1[3]; /* 03 12 04 */
86 unsigned char channel; /* 1 or 2 */
87 uint32_t freq;
88 uint32_t size;
89 uint32_t unknown2; /* 01 f4 03 00 */
90 uint32_t unknown3; /* 00 00 00 00 */
91 uint32_t unknown4; /* 00 00 00 00 */
92
93 /* if loop
94 unknown3 00 15 00 01
95 unknown4 00 00 00 01
96 long loop_start_sample;
97 long loop_start_byte;
98 long loop_end_sample;
99 long loop_end_byte;
100 long
101 */
102 } adxhdr; /* big endian */
103 /* offset-6 "(c)CRI" */
104 #endif
105 AV_WB32(buf+0x00,0x80000000|0x20);
106 AV_WB32(buf+0x04,0x03120400|avctx->channels);
107 AV_WB32(buf+0x08,avctx->sample_rate);
108 AV_WB32(buf+0x0c,0); /* FIXME: set after */
109 AV_WB32(buf+0x10,0x01040300);
110 AV_WB32(buf+0x14,0x00000000);
111 AV_WB32(buf+0x18,0x00000000);
112 memcpy(buf+0x1c,"\0\0(c)CRI",8);
113 return 0x20+4;
114 }
115
116 static av_cold int adx_encode_init(AVCodecContext *avctx)
117 {
118 if (avctx->channels > 2)
119 return -1; /* only stereo or mono =) */
120 avctx->frame_size = 32;
121
122 avctx->coded_frame= avcodec_alloc_frame();
123 avctx->coded_frame->key_frame= 1;
124
125 // avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
126
127 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
128
129 return 0;
130 }
131
132 static av_cold int adx_encode_close(AVCodecContext *avctx)
133 {
134 av_freep(&avctx->coded_frame);
135
136 return 0;
137 }
138
139 static int adx_encode_frame(AVCodecContext *avctx,
140 uint8_t *frame, int buf_size, void *data)
141 {
142 ADXContext *c = avctx->priv_data;
143 const short *samples = data;
144 unsigned char *dst = frame;
145 int rest = avctx->frame_size;
146
147 /*
148 input data size =
149 avconv.c:do_audio_out()
150 frame_bytes = enc->frame_size * 2 * enc->channels;
151 */
152
153 // printf("sz=%d ",buf_size); fflush(stdout);
154 if (!c->header_parsed) {
155 int hdrsize = adx_encode_header(avctx,dst,buf_size);
156 dst+=hdrsize;
157 c->header_parsed = 1;
158 }
159
160 if (avctx->channels==1) {
161 while(rest>=32) {
162 adx_encode(dst,samples,c->prev);
163 dst+=18;
164 samples+=32;
165 rest-=32;
166 }
167 } else {
168 while(rest>=32*2) {
169 short tmpbuf[32*2];
170 int i;
171
172 for(i=0;i<32;i++) {
173 tmpbuf[i] = samples[i*2];
174 tmpbuf[i+32] = samples[i*2+1];
175 }
176
177 adx_encode(dst,tmpbuf,c->prev);
178 adx_encode(dst+18,tmpbuf+32,c->prev+1);
179 dst+=18*2;
180 samples+=32*2;
181 rest-=32*2;
182 }
183 }
184 return dst-frame;
185 }
186
187 AVCodec ff_adpcm_adx_encoder = {
188 .name = "adpcm_adx",
189 .type = AVMEDIA_TYPE_AUDIO,
190 .id = CODEC_ID_ADPCM_ADX,
191 .priv_data_size = sizeof(ADXContext),
192 .init = adx_encode_init,
193 .encode = adx_encode_frame,
194 .close = adx_encode_close,
195 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
196 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
197 };