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source: vbox/trunk/src/libs/ffmpeg-20060710/libavcodec/adx.c@ 10516

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1/*
2 * ADX ADPCM codecs
3 * Copyright (c) 2001,2003 BERO
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "avcodec.h"
20
21/**
22 * @file adx.c
23 * SEGA CRI adx codecs.
24 *
25 * Reference documents:
26 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
27 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
28 */
29
30typedef struct {
31 int s1,s2;
32} PREV;
33
34typedef struct {
35 PREV prev[2];
36 int header_parsed;
37 unsigned char dec_temp[18*2];
38 unsigned short enc_temp[32*2];
39 int in_temp;
40} ADXContext;
41
42//#define BASEVOL 0x11e0
43#define BASEVOL 0x4000
44#define SCALE1 0x7298
45#define SCALE2 0x3350
46
47#define CLIP(s) if (s>32767) s=32767; else if (s<-32768) s=-32768
48
49/* 18 bytes <-> 32 samples */
50
51#ifdef CONFIG_ENCODERS
52static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
53{
54 int scale;
55 int i;
56 int s0,s1,s2,d;
57 int max=0;
58 int min=0;
59 int data[32];
60
61 s1 = prev->s1;
62 s2 = prev->s2;
63 for(i=0;i<32;i++) {
64 s0 = wav[i];
65 d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
66 data[i]=d;
67 if (max<d) max=d;
68 if (min>d) min=d;
69 s2 = s1;
70 s1 = s0;
71 }
72 prev->s1 = s1;
73 prev->s2 = s2;
74
75 /* -8..+7 */
76
77 if (max==0 && min==0) {
78 memset(adx,0,18);
79 return;
80 }
81
82 if (max/7>-min/8) scale = max/7;
83 else scale = -min/8;
84
85 if (scale==0) scale=1;
86
87 adx[0] = scale>>8;
88 adx[1] = scale;
89
90 for(i=0;i<16;i++) {
91 adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
92 }
93}
94#endif //CONFIG_ENCODERS
95
96static void adx_decode(short *out,const unsigned char *in,PREV *prev)
97{
98 int scale = ((in[0]<<8)|(in[1]));
99 int i;
100 int s0,s1,s2,d;
101
102// printf("%x ",scale);
103
104 in+=2;
105 s1 = prev->s1;
106 s2 = prev->s2;
107 for(i=0;i<16;i++) {
108 d = in[i];
109 // d>>=4; if (d&8) d-=16;
110 d = ((signed char)d >> 4);
111 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
112 CLIP(s0);
113 *out++=s0;
114 s2 = s1;
115 s1 = s0;
116
117 d = in[i];
118 //d&=15; if (d&8) d-=16;
119 d = ((signed char)(d<<4) >> 4);
120 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
121 CLIP(s0);
122 *out++=s0;
123 s2 = s1;
124 s1 = s0;
125 }
126 prev->s1 = s1;
127 prev->s2 = s2;
128
129}
130
131static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
132{
133 short tmp[32*2];
134 int i;
135
136 adx_decode(tmp ,in ,prev);
137 adx_decode(tmp+32,in+18,prev+1);
138 for(i=0;i<32;i++) {
139 out[i*2] = tmp[i];
140 out[i*2+1] = tmp[i+32];
141 }
142}
143
144#ifdef CONFIG_ENCODERS
145
146static void write_long(unsigned char *p,uint32_t v)
147{
148 p[0] = v>>24;
149 p[1] = v>>16;
150 p[2] = v>>8;
151 p[3] = v;
152}
153
154static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
155{
156#if 0
157 struct {
158 uint32_t offset; /* 0x80000000 + sample start - 4 */
159 unsigned char unknown1[3]; /* 03 12 04 */
160 unsigned char channel; /* 1 or 2 */
161 uint32_t freq;
162 uint32_t size;
163 uint32_t unknown2; /* 01 f4 03 00 */
164 uint32_t unknown3; /* 00 00 00 00 */
165 uint32_t unknown4; /* 00 00 00 00 */
166
167 /* if loop
168 unknown3 00 15 00 01
169 unknown4 00 00 00 01
170 long loop_start_sample;
171 long loop_start_byte;
172 long loop_end_sample;
173 long loop_end_byte;
174 long
175 */
176 } adxhdr; /* big endian */
177 /* offset-6 "(c)CRI" */
178#endif
179 write_long(buf+0x00,0x80000000|0x20);
180 write_long(buf+0x04,0x03120400|avctx->channels);
181 write_long(buf+0x08,avctx->sample_rate);
182 write_long(buf+0x0c,0); /* FIXME: set after */
183 write_long(buf+0x10,0x01040300);
184 write_long(buf+0x14,0x00000000);
185 write_long(buf+0x18,0x00000000);
186 memcpy(buf+0x1c,"\0\0(c)CRI",8);
187 return 0x20+4;
188}
189
190static int adx_decode_init(AVCodecContext *avctx);
191static int adx_encode_init(AVCodecContext *avctx)
192{
193 if (avctx->channels > 2)
194 return -1; /* only stereo or mono =) */
195 avctx->frame_size = 32;
196
197 avctx->coded_frame= avcodec_alloc_frame();
198 avctx->coded_frame->key_frame= 1;
199
200// avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
201
202 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
203 adx_decode_init(avctx);
204
205 return 0;
206}
207
208static int adx_encode_close(AVCodecContext *avctx)
209{
210 av_freep(&avctx->coded_frame);
211
212 return 0;
213}
214
215static int adx_encode_frame(AVCodecContext *avctx,
216 uint8_t *frame, int buf_size, void *data)
217{
218 ADXContext *c = avctx->priv_data;
219 const short *samples = data;
220 unsigned char *dst = frame;
221 int rest = avctx->frame_size;
222
223/*
224 input data size =
225 ffmpeg.c: do_audio_out()
226 frame_bytes = enc->frame_size * 2 * enc->channels;
227*/
228
229// printf("sz=%d ",buf_size); fflush(stdout);
230 if (!c->header_parsed) {
231 int hdrsize = adx_encode_header(avctx,dst,buf_size);
232 dst+=hdrsize;
233 c->header_parsed = 1;
234 }
235
236 if (avctx->channels==1) {
237 while(rest>=32) {
238 adx_encode(dst,samples,c->prev);
239 dst+=18;
240 samples+=32;
241 rest-=32;
242 }
243 } else {
244 while(rest>=32*2) {
245 short tmpbuf[32*2];
246 int i;
247
248 for(i=0;i<32;i++) {
249 tmpbuf[i] = samples[i*2];
250 tmpbuf[i+32] = samples[i*2+1];
251 }
252
253 adx_encode(dst,tmpbuf,c->prev);
254 adx_encode(dst+18,tmpbuf+32,c->prev+1);
255 dst+=18*2;
256 samples+=32*2;
257 rest-=32*2;
258 }
259 }
260 return dst-frame;
261}
262
263#endif //CONFIG_ENCODERS
264
265static uint32_t read_long(const unsigned char *p)
266{
267 return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
268}
269
270static int is_adx(const unsigned char *buf,size_t bufsize)
271{
272 int offset;
273
274 if (buf[0]!=0x80) return 0;
275 offset = (read_long(buf)^0x80000000)+4;
276 if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
277 return offset;
278}
279
280/* return data offset or 6 */
281static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
282{
283 int offset;
284 int channels,freq,size;
285
286 offset = is_adx(buf,bufsize);
287 if (offset==0) return 0;
288
289 channels = buf[7];
290 freq = read_long(buf+8);
291 size = read_long(buf+12);
292
293// printf("freq=%d ch=%d\n",freq,channels);
294
295 avctx->sample_rate = freq;
296 avctx->channels = channels;
297 avctx->bit_rate = freq*channels*18*8/32;
298// avctx->frame_size = 18*channels;
299
300 return offset;
301}
302
303static int adx_decode_init(AVCodecContext * avctx)
304{
305 ADXContext *c = avctx->priv_data;
306
307// printf("adx_decode_init\n"); fflush(stdout);
308 c->prev[0].s1 = 0;
309 c->prev[0].s2 = 0;
310 c->prev[1].s1 = 0;
311 c->prev[1].s2 = 0;
312 c->header_parsed = 0;
313 c->in_temp = 0;
314 return 0;
315}
316
317#if 0
318static void dump(unsigned char *buf,size_t len)
319{
320 int i;
321 for(i=0;i<len;i++) {
322 if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x ",i);
323 av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
324 if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
325 }
326 av_log(NULL, AV_LOG_ERROR, "\n");
327}
328#endif
329
330static int adx_decode_frame(AVCodecContext *avctx,
331 void *data, int *data_size,
332 uint8_t *buf0, int buf_size)
333{
334 ADXContext *c = avctx->priv_data;
335 short *samples = data;
336 const uint8_t *buf = buf0;
337 int rest = buf_size;
338
339 if (!c->header_parsed) {
340 int hdrsize = adx_decode_header(avctx,buf,rest);
341 if (hdrsize==0) return -1;
342 c->header_parsed = 1;
343 buf += hdrsize;
344 rest -= hdrsize;
345 }
346
347 if (c->in_temp) {
348 int copysize = 18*avctx->channels - c->in_temp;
349 memcpy(c->dec_temp+c->in_temp,buf,copysize);
350 rest -= copysize;
351 buf += copysize;
352 if (avctx->channels==1) {
353 adx_decode(samples,c->dec_temp,c->prev);
354 samples += 32;
355 } else {
356 adx_decode_stereo(samples,c->dec_temp,c->prev);
357 samples += 32*2;
358 }
359 }
360 //
361 if (avctx->channels==1) {
362 while(rest>=18) {
363 adx_decode(samples,buf,c->prev);
364 rest-=18;
365 buf+=18;
366 samples+=32;
367 }
368 } else {
369 while(rest>=18*2) {
370 adx_decode_stereo(samples,buf,c->prev);
371 rest-=18*2;
372 buf+=18*2;
373 samples+=32*2;
374 }
375 }
376 //
377 c->in_temp = rest;
378 if (rest) {
379 memcpy(c->dec_temp,buf,rest);
380 buf+=rest;
381 }
382 *data_size = (uint8_t*)samples - (uint8_t*)data;
383// printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
384 return buf-buf0;
385}
386
387#ifdef CONFIG_ENCODERS
388AVCodec adpcm_adx_encoder = {
389 "adpcm_adx",
390 CODEC_TYPE_AUDIO,
391 CODEC_ID_ADPCM_ADX,
392 sizeof(ADXContext),
393 adx_encode_init,
394 adx_encode_frame,
395 adx_encode_close,
396 NULL,
397};
398#endif //CONFIG_ENCODERS
399
400AVCodec adpcm_adx_decoder = {
401 "adpcm_adx",
402 CODEC_TYPE_AUDIO,
403 CODEC_ID_ADPCM_ADX,
404 sizeof(ADXContext),
405 adx_decode_init,
406 NULL,
407 NULL,
408 adx_decode_frame,
409};
410
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