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;
92 adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
95 #endif //CONFIG_ENCODERS
97 static void adx_decode(short *out,const unsigned char *in,PREV *prev)
99 int scale = AV_RB16(in);
103 // printf("%x ",scale);
110 // d>>=4; if (d&8) d-=16;
111 d = ((signed char)d >> 4);
112 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
119 //d&=15; if (d&8) d-=16;
120 d = ((signed char)(d<<4) >> 4);
121 s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
132 static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
137 adx_decode(tmp ,in ,prev);
138 adx_decode(tmp+32,in+18,prev+1);
141 out[i*2+1] = tmp[i+32];
145 #ifdef CONFIG_ENCODERS
147 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
151 uint32_t offset; /* 0x80000000 + sample start - 4 */
152 unsigned char unknown1[3]; /* 03 12 04 */
153 unsigned char channel; /* 1 or 2 */
156 uint32_t unknown2; /* 01 f4 03 00 */
157 uint32_t unknown3; /* 00 00 00 00 */
158 uint32_t unknown4; /* 00 00 00 00 */
163 long loop_start_sample;
164 long loop_start_byte;
165 long loop_end_sample;
169 } adxhdr; /* big endian */
170 /* offset-6 "(c)CRI" */
172 AV_WB32(buf+0x00,0x80000000|0x20);
173 AV_WB32(buf+0x04,0x03120400|avctx->channels);
174 AV_WB32(buf+0x08,avctx->sample_rate);
175 AV_WB32(buf+0x0c,0); /* FIXME: set after */
176 AV_WB32(buf+0x10,0x01040300);
177 AV_WB32(buf+0x14,0x00000000);
178 AV_WB32(buf+0x18,0x00000000);
179 memcpy(buf+0x1c,"\0\0(c)CRI",8);
183 static int adx_decode_init(AVCodecContext *avctx);
184 static int adx_encode_init(AVCodecContext *avctx)
186 if (avctx->channels > 2)
187 return -1; /* only stereo or mono =) */
188 avctx->frame_size = 32;
190 avctx->coded_frame= avcodec_alloc_frame();
191 avctx->coded_frame->key_frame= 1;
193 // avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
195 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
196 adx_decode_init(avctx);
201 static int adx_encode_close(AVCodecContext *avctx)
203 av_freep(&avctx->coded_frame);
208 static int adx_encode_frame(AVCodecContext *avctx,
209 uint8_t *frame, int buf_size, void *data)
211 ADXContext *c = avctx->priv_data;
212 const short *samples = data;
213 unsigned char *dst = frame;
214 int rest = avctx->frame_size;
218 ffmpeg.c: do_audio_out()
219 frame_bytes = enc->frame_size * 2 * enc->channels;
222 // printf("sz=%d ",buf_size); fflush(stdout);
223 if (!c->header_parsed) {
224 int hdrsize = adx_encode_header(avctx,dst,buf_size);
226 c->header_parsed = 1;
229 if (avctx->channels==1) {
231 adx_encode(dst,samples,c->prev);
242 tmpbuf[i] = samples[i*2];
243 tmpbuf[i+32] = samples[i*2+1];
246 adx_encode(dst,tmpbuf,c->prev);
247 adx_encode(dst+18,tmpbuf+32,c->prev+1);
256 #endif //CONFIG_ENCODERS
258 static int is_adx(const unsigned char *buf,size_t bufsize)
262 if (buf[0]!=0x80) return 0;
263 offset = (AV_RB32(buf)^0x80000000)+4;
264 if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
268 /* return data offset or 6 */
269 static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
272 int channels,freq,size;
274 offset = is_adx(buf,bufsize);
275 if (offset==0) return 0;
278 freq = AV_RB32(buf+8);
279 size = AV_RB32(buf+12);
281 // printf("freq=%d ch=%d\n",freq,channels);
283 avctx->sample_rate = freq;
284 avctx->channels = channels;
285 avctx->bit_rate = freq*channels*18*8/32;
286 // avctx->frame_size = 18*channels;
291 static int adx_decode_init(AVCodecContext * avctx)
293 ADXContext *c = avctx->priv_data;
295 // printf("adx_decode_init\n"); fflush(stdout);
300 c->header_parsed = 0;
306 static void dump(unsigned char *buf,size_t len)
310 if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x ",i);
311 av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
312 if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
314 av_log(NULL, AV_LOG_ERROR, "\n");
318 static int adx_decode_frame(AVCodecContext *avctx,
319 void *data, int *data_size,
320 uint8_t *buf0, int buf_size)
322 ADXContext *c = avctx->priv_data;
323 short *samples = data;
324 const uint8_t *buf = buf0;
327 if (!c->header_parsed) {
328 int hdrsize = adx_decode_header(avctx,buf,rest);
329 if (hdrsize==0) return -1;
330 c->header_parsed = 1;
336 int copysize = 18*avctx->channels - c->in_temp;
337 memcpy(c->dec_temp+c->in_temp,buf,copysize);
340 if (avctx->channels==1) {
341 adx_decode(samples,c->dec_temp,c->prev);
344 adx_decode_stereo(samples,c->dec_temp,c->prev);
349 if (avctx->channels==1) {
351 adx_decode(samples,buf,c->prev);
358 adx_decode_stereo(samples,buf,c->prev);
367 memcpy(c->dec_temp,buf,rest);
370 *data_size = (uint8_t*)samples - (uint8_t*)data;
371 // printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
375 #ifdef CONFIG_ENCODERS
376 AVCodec adpcm_adx_encoder = {
386 #endif //CONFIG_ENCODERS
388 AVCodec adpcm_adx_decoder = {