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* Copyright (c) 2001,2003 BERO
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* SEGA CRI adx codecs.
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* Reference documents:
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* http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
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* adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
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unsigned char dec_temp[18*2];
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unsigned short enc_temp[32*2];
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//#define BASEVOL 0x11e0
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#define BASEVOL 0x4000
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#define CLIP(s) if (s>32767) s=32767; else if (s<-32768) s=-32768
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/* 18 bytes <-> 32 samples */
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#ifdef CONFIG_ENCODERS
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static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
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d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
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if (max==0 && min==0) {
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if (max/7>-min/8) scale = max/7;
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if (scale==0) scale=1;
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adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
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#endif //CONFIG_ENCODERS
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static void adx_decode(short *out,const unsigned char *in,PREV *prev)
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int scale = ((in[0]<<8)|(in[1]));
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// printf("%x ",scale);
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// d>>=4; if (d&8) d-=16;
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d = ((signed char)d >> 4);
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s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
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//d&=15; if (d&8) d-=16;
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d = ((signed char)(d<<4) >> 4);
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s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14;
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static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev)
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adx_decode(tmp ,in ,prev);
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adx_decode(tmp+32,in+18,prev+1);
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out[i*2+1] = tmp[i+32];
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#ifdef CONFIG_ENCODERS
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static void write_long(unsigned char *p,uint32_t v)
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static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
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uint32_t offset; /* 0x80000000 + sample start - 4 */
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unsigned char unknown1[3]; /* 03 12 04 */
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unsigned char channel; /* 1 or 2 */
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uint32_t unknown2; /* 01 f4 03 00 */
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uint32_t unknown3; /* 00 00 00 00 */
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uint32_t unknown4; /* 00 00 00 00 */
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long loop_start_sample;
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long loop_start_byte;
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long loop_end_sample;
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} adxhdr; /* big endian */
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/* offset-6 "(c)CRI" */
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write_long(buf+0x00,0x80000000|0x20);
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write_long(buf+0x04,0x03120400|avctx->channels);
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write_long(buf+0x08,avctx->sample_rate);
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write_long(buf+0x0c,0); /* FIXME: set after */
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write_long(buf+0x10,0x01040300);
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write_long(buf+0x14,0x00000000);
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write_long(buf+0x18,0x00000000);
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memcpy(buf+0x1c,"\0\0(c)CRI",8);
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static int adx_decode_init(AVCodecContext *avctx);
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static int adx_encode_init(AVCodecContext *avctx)
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if (avctx->channels > 2)
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return -1; /* only stereo or mono =) */
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avctx->frame_size = 32;
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avctx->coded_frame= avcodec_alloc_frame();
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avctx->coded_frame->key_frame= 1;
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// avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
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av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
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adx_decode_init(avctx);
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static int adx_encode_close(AVCodecContext *avctx)
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av_freep(&avctx->coded_frame);
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static int adx_encode_frame(AVCodecContext *avctx,
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uint8_t *frame, int buf_size, void *data)
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ADXContext *c = avctx->priv_data;
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const short *samples = data;
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unsigned char *dst = frame;
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int rest = avctx->frame_size;
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ffmpeg.c: do_audio_out()
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frame_bytes = enc->frame_size * 2 * enc->channels;
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// printf("sz=%d ",buf_size); fflush(stdout);
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if (!c->header_parsed) {
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int hdrsize = adx_encode_header(avctx,dst,buf_size);
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c->header_parsed = 1;
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if (avctx->channels==1) {
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adx_encode(dst,samples,c->prev);
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tmpbuf[i] = samples[i*2];
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tmpbuf[i+32] = samples[i*2+1];
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adx_encode(dst,tmpbuf,c->prev);
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adx_encode(dst+18,tmpbuf+32,c->prev+1);
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#endif //CONFIG_ENCODERS
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static uint32_t read_long(const unsigned char *p)
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return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3];
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int is_adx(const unsigned char *buf,size_t bufsize)
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if (buf[0]!=0x80) return 0;
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offset = (read_long(buf)^0x80000000)+4;
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if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;
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/* return data offset or 6 */
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static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize)
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int channels,freq,size;
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offset = is_adx(buf,bufsize);
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if (offset==0) return 0;
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freq = read_long(buf+8);
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size = read_long(buf+12);
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// printf("freq=%d ch=%d\n",freq,channels);
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avctx->sample_rate = freq;
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avctx->channels = channels;
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avctx->bit_rate = freq*channels*18*8/32;
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// avctx->frame_size = 18*channels;
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static int adx_decode_init(AVCodecContext * avctx)
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ADXContext *c = avctx->priv_data;
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// printf("adx_decode_init\n"); fflush(stdout);
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c->header_parsed = 0;
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static void dump(unsigned char *buf,size_t len)
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if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x ",i);
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av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);
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if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");
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av_log(NULL, AV_LOG_ERROR, "\n");
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static int adx_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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uint8_t *buf0, int buf_size)
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ADXContext *c = avctx->priv_data;
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short *samples = data;
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const uint8_t *buf = buf0;
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if (!c->header_parsed) {
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int hdrsize = adx_decode_header(avctx,buf,rest);
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if (hdrsize==0) return -1;
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c->header_parsed = 1;
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int copysize = 18*avctx->channels - c->in_temp;
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memcpy(c->dec_temp+c->in_temp,buf,copysize);
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if (avctx->channels==1) {
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adx_decode(samples,c->dec_temp,c->prev);
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adx_decode_stereo(samples,c->dec_temp,c->prev);
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if (avctx->channels==1) {
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adx_decode(samples,buf,c->prev);
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adx_decode_stereo(samples,buf,c->prev);
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memcpy(c->dec_temp,buf,rest);
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*data_size = (uint8_t*)samples - (uint8_t*)data;
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// printf("%d:%d ",buf-buf0,*data_size); fflush(stdout);
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#ifdef CONFIG_ENCODERS
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AVCodec adx_adpcm_encoder = {
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#endif //CONFIG_ENCODERS
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AVCodec adx_adpcm_decoder = {