mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 2383 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Mike Melanson
22 years ago
parent
e986b6e2c7
commit
f127136608
1 changed files with 0 additions and 189 deletions
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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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