3 * Copyright (c) 2001,2003 BERO
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.
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.
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
23 * SEGA CRI adx codecs.
25 * Reference documents:
26 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
27 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
37 unsigned char dec_temp[18*2];
38 unsigned short enc_temp[32*2];
42 //#define BASEVOL 0x11e0
43 #define BASEVOL 0x4000
47 #define CLIP(s) if (s>32767) s=32767; else if (s<-32768) s=-32768
49 /* 18 bytes <-> 32 samples */
51 #ifdef CONFIG_ENCODERS
52 static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
65 d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
77 if (max==0 && min==0) {
82 if (max/7>-min/8) scale = max/7;
85 if (scale==0) scale=1;
91 adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
94 #endif //CONFIG_ENCODERS
96 static void adx_decode(short *out,const unsigned char *in,PREV *prev)
98 int scale = ((in[0]<<8)|(in[1]));
102 // printf("%x ",scale);
109 // d>>=4; if (d&8) d-=16;
110 d = ((signed char)d >> 4);
111 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
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;
131 static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
136 adx_decode(tmp ,in ,prev);
137 adx_decode(tmp+32,in+18,prev+1);
140 out[i*2+1] = tmp[i+32];
144 #ifdef CONFIG_ENCODERS
146 static void write_long(unsigned char *p,uint32_t v)
154 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
158 uint32_t offset; /* 0x80000000 + sample start - 4 */
159 unsigned char unknown1[3]; /* 03 12 04 */
160 unsigned char channel; /* 1 or 2 */
163 uint32_t unknown2; /* 01 f4 03 00 */
164 uint32_t unknown3; /* 00 00 00 00 */
165 uint32_t unknown4; /* 00 00 00 00 */
170 long loop_start_sample;
171 long loop_start_byte;
172 long loop_end_sample;
176 } adxhdr; /* big endian */
177 /* offset-6 "(c)CRI" */
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);
190 static int adx_decode_init(AVCodecContext *avctx);
191 static int adx_encode_init(AVCodecContext *avctx)
193 if (avctx->channels > 2)
194 return -1; /* only stereo or mono =) */
195 avctx->frame_size = 32;
197 avctx->coded_frame= avcodec_alloc_frame();
198 avctx->coded_frame->key_frame= 1;
200 // avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
202 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
203 adx_decode_init(avctx);
208 static int adx_encode_close(AVCodecContext *avctx)
210 av_freep(&avctx->coded_frame);
215 static int adx_encode_frame(AVCodecContext *avctx,
216 uint8_t *frame, int buf_size, void *data)
218 ADXContext *c = avctx->priv_data;
219 const short *samples = data;
220 unsigned char *dst = frame;
221 int rest = avctx->frame_size;
225 ffmpeg.c: do_audio_out()
226 frame_bytes = enc->frame_size * 2 * enc->channels;
229 // printf("sz=%d ",buf_size); fflush(stdout);
230 if (!c->header_parsed) {
231 int hdrsize = adx_encode_header(avctx,dst,buf_size);
233 c->header_parsed = 1;
236 if (avctx->channels==1) {
238 adx_encode(dst,samples,c->prev);
249 tmpbuf[i] = samples[i*2];
250 tmpbuf[i+32] = samples[i*2+1];
253 adx_encode(dst,tmpbuf,c->prev);
254 adx_encode(dst+18,tmpbuf+32,c->prev+1);
263 #endif //CONFIG_ENCODERS
265 static uint32_t read_long(const unsigned char *p)
267 return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
270 static int is_adx(const unsigned char *buf,size_t bufsize)
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;
280 /* return data offset or 6 */
281 static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
284 int channels,freq,size;
286 offset = is_adx(buf,bufsize);
287 if (offset==0) return 0;
290 freq = read_long(buf+8);
291 size = read_long(buf+12);
293 // printf("freq=%d ch=%d\n",freq,channels);
295 avctx->sample_rate = freq;
296 avctx->channels = channels;
297 avctx->bit_rate = freq*channels*18*8/32;
298 // avctx->frame_size = 18*channels;
303 static int adx_decode_init(AVCodecContext * avctx)
305 ADXContext *c = avctx->priv_data;
307 // printf("adx_decode_init\n"); fflush(stdout);
312 c->header_parsed = 0;
318 static void dump(unsigned char *buf,size_t len)
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");
326 av_log(NULL, AV_LOG_ERROR, "\n");
330 static int adx_decode_frame(AVCodecContext *avctx,
331 void *data, int *data_size,
332 uint8_t *buf0, int buf_size)
334 ADXContext *c = avctx->priv_data;
335 short *samples = data;
336 const uint8_t *buf = buf0;
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;
348 int copysize = 18*avctx->channels - c->in_temp;
349 memcpy(c->dec_temp+c->in_temp,buf,copysize);
352 if (avctx->channels==1) {
353 adx_decode(samples,c->dec_temp,c->prev);
356 adx_decode_stereo(samples,c->dec_temp,c->prev);
361 if (avctx->channels==1) {
363 adx_decode(samples,buf,c->prev);
370 adx_decode_stereo(samples,buf,c->prev);
379 memcpy(c->dec_temp,buf,rest);
382 *data_size = (uint8_t*)samples - (uint8_t*)data;
383 // printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
387 #ifdef CONFIG_ENCODERS
388 AVCodec adpcm_adx_encoder = {
398 #endif //CONFIG_ENCODERS
400 AVCodec adpcm_adx_decoder = {