this should be part of adpcm.c
Originally committed as revision 2383 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Mike Melanson
parent
e986b6e2c7
commit
f127136608
189
libavcodec/xa.c
189
libavcodec/xa.c
@ -1,189 +0,0 @@
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/*
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* CD-ROM XA ADPCM codecs
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* Copyright (c) 1999,2003 BERO
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*
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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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*
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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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*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include "avcodec.h"
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/**
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* @file xa.c
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* CD-ROM XA ADPCM codecs.
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*
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* Reference documents:
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* http://ku-www.ss.titech.ac.jp/~yatsushi/xaadpcm.html
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* vagpack & depack http://homepages.compuserve.de/bITmASTER32/psx-index.html
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* readstr http://www.geocities.co.jp/Playtown/2004/
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*/
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typedef struct {
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int s1,s2;
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} PREV;
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typedef struct {
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PREV prev[2];
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} XAContext;
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#define CLIP(s) if (s<-32768) s=-32768; else if (s>32767) s=32767
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static void xa_decode(short *out,const unsigned char *in,PREV *prev,int inc)
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{
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const static int f[5][2] = {
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{0,0},
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{60,0},
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{115,-52},
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{98,-55},
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{122,-60}
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};
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int i,j;
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for(i=0;i<4;i++) {
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int shift,filter,f0,f1;
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int s_1,s_2;
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shift = 12 - (in[4+i*2] & 15);
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filter = in[4+i*2] >> 4;
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f0 = f[filter][0];
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f1 = f[filter][1];
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s_1 = prev->s1;
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s_2 = prev->s2;
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for(j=0;j<28;j++) {
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int d,s,t;
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d = in[16+i+j*4];
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//t = d&0xf;
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//if (t>=8) t-=16;
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t = (signed char)(d<<4)>>4;
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s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
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CLIP(s);
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*out = s;
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out += inc;
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s_2 = s_1;
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s_1 = s;
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}
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if (inc==2) { /* stereo */
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prev->s1 = s_1;
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prev->s2 = s_2;
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s_1 = prev[1].s1;
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s_2 = prev[1].s2;
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out = out + 1 - 28*2;
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}
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shift = 12 - (in[5+i*2] & 15);
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filter = in[5+i*2] >> 4;
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f0 = f[filter][0];
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f1 = f[filter][1];
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for(j=0;j<28;j++) {
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int d,s,t;
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d = in[16+i+j*4];
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//t = d>>4;
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//if (t>=8) t-=16;
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t = (signed char)d >> 4;
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s = ( t<<shift ) + ((s_1*f0 + s_2*f1+32)>>6);
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CLIP(s);
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*out = s;
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out += inc;
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s_2 = s_1;
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s_1 = s;
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}
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if (inc==2) { /* stereo */
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prev[1].s1 = s_1;
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prev[1].s2 = s_2;
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out -= 1;
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} else {
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prev[0].s1 = s_1;
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prev[0].s2 = s_2;
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}
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}
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}
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static int xa_decode_init(AVCodecContext * avctx)
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{
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XAContext *c = avctx->priv_data;
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printf("xa init %d\n",avctx->channels);
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c->prev[0].s1 = 0;
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c->prev[0].s2 = 0;
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c->prev[1].s1 = 0;
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c->prev[1].s2 = 0;
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switch(avctx->channels) {
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case 1:
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case 2:
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return 0;
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default:
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return -1;
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}
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}
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static int xa_decode_frame(AVCodecContext *avctx,
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void *data, int *data_size,
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const uint8_t *buf0, int buf_size)
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{
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XAContext *c = avctx->priv_data;
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short *samples = data;
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const uint8_t *buf = buf0;
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// printf("xa decode %d\n",buf_size);
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c->prev[0].s1 = 0;
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c->prev[0].s2 = 0;
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c->prev[1].s1 = 0;
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c->prev[1].s2 = 0;
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while(buf_size>=128) {
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xa_decode(samples,buf,c->prev,avctx->channels);
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buf+=128;
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samples += 28*8;
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buf_size-=128;
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}
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*data_size = (char*)samples - (char*)data;
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return buf-buf0;
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}
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#define DEFINE_ENCODER(id, name,context) \
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AVCodec name ## _encoder = { \
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#name, \
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CODEC_TYPE_AUDIO, \
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id, \
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sizeof(context), \
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name ## _encode_init, \
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name ## _encode_frame, \
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name ## _encode_close, \
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NULL, \
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};
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#define DEFINE_DECODER(id, name,context) \
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AVCodec name ## _decoder = { \
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#name, \
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CODEC_TYPE_AUDIO, \
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id, \
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sizeof(context), \
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name ## _decode_init, \
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NULL, \
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NULL, \
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name ## _decode_frame, \
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};
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DEFINE_DECODER(CODEC_ID_ADPCM_XA,xa,XAContext)
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