3 * Copyright (c) 2001,2003 BERO
5 * This file is part of FFmpeg.
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.
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.
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
25 * SEGA CRI adx codecs.
27 * Reference documents:
28 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
29 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
39 unsigned char dec_temp[18*2];
40 unsigned short enc_temp[32*2];
44 //#define BASEVOL 0x11e0
45 #define BASEVOL 0x4000
49 #define CLIP(s) if (s>32767) s=32767; else if (s<-32768) s=-32768
51 /* 18 bytes <-> 32 samples */
53 #ifdef CONFIG_ENCODERS
54 static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
67 d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
79 if (max==0 && min==0) {
84 if (max/7>-min/8) scale = max/7;
87 if (scale==0) scale=1;
93 adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
96 #endif //CONFIG_ENCODERS
98 static void adx_decode(short *out,const unsigned char *in,PREV *prev)
100 int scale = ((in[0]<<8)|(in[1]));
104 // printf("%x ",scale);
111 // d>>=4; if (d&8) d-=16;
112 d = ((signed char)d >> 4);
113 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
120 //d&=15; if (d&8) d-=16;
121 d = ((signed char)(d<<4) >> 4);
122 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
133 static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
138 adx_decode(tmp ,in ,prev);
139 adx_decode(tmp+32,in+18,prev+1);
142 out[i*2+1] = tmp[i+32];
146 #ifdef CONFIG_ENCODERS
148 static void write_long(unsigned char *p,uint32_t v)
156 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
160 uint32_t offset; /* 0x80000000 + sample start - 4 */
161 unsigned char unknown1[3]; /* 03 12 04 */
162 unsigned char channel; /* 1 or 2 */
165 uint32_t unknown2; /* 01 f4 03 00 */
166 uint32_t unknown3; /* 00 00 00 00 */
167 uint32_t unknown4; /* 00 00 00 00 */
172 long loop_start_sample;
173 long loop_start_byte;
174 long loop_end_sample;
178 } adxhdr; /* big endian */
179 /* offset-6 "(c)CRI" */
181 write_long(buf+0x00,0x80000000|0x20);
182 write_long(buf+0x04,0x03120400|avctx->channels);
183 write_long(buf+0x08,avctx->sample_rate);
184 write_long(buf+0x0c,0); /* FIXME: set after */
185 write_long(buf+0x10,0x01040300);
186 write_long(buf+0x14,0x00000000);
187 write_long(buf+0x18,0x00000000);
188 memcpy(buf+0x1c,"\0\0(c)CRI",8);
192 static int adx_decode_init(AVCodecContext *avctx);
193 static int adx_encode_init(AVCodecContext *avctx)
195 if (avctx->channels > 2)
196 return -1; /* only stereo or mono =) */
197 avctx->frame_size = 32;
199 avctx->coded_frame= avcodec_alloc_frame();
200 avctx->coded_frame->key_frame= 1;
202 // avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
204 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
205 adx_decode_init(avctx);
210 static int adx_encode_close(AVCodecContext *avctx)
212 av_freep(&avctx->coded_frame);
217 static int adx_encode_frame(AVCodecContext *avctx,
218 uint8_t *frame, int buf_size, void *data)
220 ADXContext *c = avctx->priv_data;
221 const short *samples = data;
222 unsigned char *dst = frame;
223 int rest = avctx->frame_size;
227 ffmpeg.c: do_audio_out()
228 frame_bytes = enc->frame_size * 2 * enc->channels;
231 // printf("sz=%d ",buf_size); fflush(stdout);
232 if (!c->header_parsed) {
233 int hdrsize = adx_encode_header(avctx,dst,buf_size);
235 c->header_parsed = 1;
238 if (avctx->channels==1) {
240 adx_encode(dst,samples,c->prev);
251 tmpbuf[i] = samples[i*2];
252 tmpbuf[i+32] = samples[i*2+1];
255 adx_encode(dst,tmpbuf,c->prev);
256 adx_encode(dst+18,tmpbuf+32,c->prev+1);
265 #endif //CONFIG_ENCODERS
267 static uint32_t read_long(const unsigned char *p)
269 return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
272 static int is_adx(const unsigned char *buf,size_t bufsize)
276 if (buf[0]!=0x80) return 0;
277 offset = (read_long(buf)^0x80000000)+4;
278 if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
282 /* return data offset or 6 */
283 static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
286 int channels,freq,size;
288 offset = is_adx(buf,bufsize);
289 if (offset==0) return 0;
292 freq = read_long(buf+8);
293 size = read_long(buf+12);
295 // printf("freq=%d ch=%d\n",freq,channels);
297 avctx->sample_rate = freq;
298 avctx->channels = channels;
299 avctx->bit_rate = freq*channels*18*8/32;
300 // avctx->frame_size = 18*channels;
305 static int adx_decode_init(AVCodecContext * avctx)
307 ADXContext *c = avctx->priv_data;
309 // printf("adx_decode_init\n"); fflush(stdout);
314 c->header_parsed = 0;
320 static void dump(unsigned char *buf,size_t len)
324 if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x ",i);
325 av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
326 if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
328 av_log(NULL, AV_LOG_ERROR, "\n");
332 static int adx_decode_frame(AVCodecContext *avctx,
333 void *data, int *data_size,
334 uint8_t *buf0, int buf_size)
336 ADXContext *c = avctx->priv_data;
337 short *samples = data;
338 const uint8_t *buf = buf0;
341 if (!c->header_parsed) {
342 int hdrsize = adx_decode_header(avctx,buf,rest);
343 if (hdrsize==0) return -1;
344 c->header_parsed = 1;
350 int copysize = 18*avctx->channels - c->in_temp;
351 memcpy(c->dec_temp+c->in_temp,buf,copysize);
354 if (avctx->channels==1) {
355 adx_decode(samples,c->dec_temp,c->prev);
358 adx_decode_stereo(samples,c->dec_temp,c->prev);
363 if (avctx->channels==1) {
365 adx_decode(samples,buf,c->prev);
372 adx_decode_stereo(samples,buf,c->prev);
381 memcpy(c->dec_temp,buf,rest);
384 *data_size = (uint8_t*)samples - (uint8_t*)data;
385 // printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
389 #ifdef CONFIG_ENCODERS
390 AVCodec adpcm_adx_encoder = {
400 #endif //CONFIG_ENCODERS
402 AVCodec adpcm_adx_decoder = {