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410 lines
9.5 KiB
410 lines
9.5 KiB
/* |
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* ADX ADPCM codecs |
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* Copyright (c) 2001,2003 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 adx.c |
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* SEGA CRI adx codecs. |
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* |
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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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*/ |
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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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int header_parsed; |
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unsigned char dec_temp[18*2]; |
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unsigned short enc_temp[32*2]; |
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int in_temp; |
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} ADXContext; |
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//#define BASEVOL 0x11e0 |
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#define BASEVOL 0x4000 |
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#define SCALE1 0x7298 |
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#define SCALE2 0x3350 |
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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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{ |
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int scale; |
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int i; |
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int s0,s1,s2,d; |
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int max=0; |
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int min=0; |
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int data[32]; |
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s1 = prev->s1; |
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s2 = prev->s2; |
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for(i=0;i<32;i++) { |
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s0 = wav[i]; |
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d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL; |
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data[i]=d; |
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if (max<d) max=d; |
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if (min>d) min=d; |
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s2 = s1; |
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s1 = s0; |
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} |
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prev->s1 = s1; |
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prev->s2 = s2; |
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/* -8..+7 */ |
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if (max==0 && min==0) { |
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memset(adx,0,18); |
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return; |
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} |
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if (max/7>-min/8) scale = max/7; |
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else scale = -min/8; |
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if (scale==0) scale=1; |
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adx[0] = scale>>8; |
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adx[1] = scale; |
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for(i=0;i<16;i++) { |
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adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf); |
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} |
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} |
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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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{ |
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int scale = ((in[0]<<8)|(in[1])); |
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int i; |
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int s0,s1,s2,d; |
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// printf("%x ",scale); |
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in+=2; |
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s1 = prev->s1; |
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s2 = prev->s2; |
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for(i=0;i<16;i++) { |
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d = in[i]; |
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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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CLIP(s0); |
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*out++=s0; |
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s2 = s1; |
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s1 = s0; |
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d = in[i]; |
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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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CLIP(s0); |
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*out++=s0; |
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s2 = s1; |
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s1 = s0; |
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} |
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prev->s1 = s1; |
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prev->s2 = s2; |
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} |
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static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev) |
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{ |
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short tmp[32*2]; |
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int i; |
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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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for(i=0;i<32;i++) { |
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out[i*2] = tmp[i]; |
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out[i*2+1] = tmp[i+32]; |
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} |
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} |
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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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{ |
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p[0] = v>>24; |
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p[1] = v>>16; |
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p[2] = v>>8; |
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p[3] = v; |
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} |
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static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize) |
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{ |
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#if 0 |
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struct { |
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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 freq; |
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uint32_t size; |
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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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/* if loop |
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unknown3 00 15 00 01 |
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unknown4 00 00 00 01 |
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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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long loop_end_byte; |
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long |
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*/ |
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} adxhdr; /* big endian */ |
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/* offset-6 "(c)CRI" */ |
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#endif |
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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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return 0x20+4; |
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} |
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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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{ |
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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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return 0; |
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} |
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static int adx_encode_close(AVCodecContext *avctx) |
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{ |
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av_freep(&avctx->coded_frame); |
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return 0; |
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} |
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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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{ |
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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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/* |
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input data 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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*/ |
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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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dst+=hdrsize; |
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c->header_parsed = 1; |
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} |
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if (avctx->channels==1) { |
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while(rest>=32) { |
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adx_encode(dst,samples,c->prev); |
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dst+=18; |
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samples+=32; |
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rest-=32; |
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} |
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} else { |
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while(rest>=32*2) { |
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short tmpbuf[32*2]; |
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int i; |
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for(i=0;i<32;i++) { |
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tmpbuf[i] = samples[i*2]; |
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tmpbuf[i+32] = samples[i*2+1]; |
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} |
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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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dst+=18*2; |
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samples+=32*2; |
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rest-=32*2; |
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} |
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} |
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return dst-frame; |
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} |
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#endif //CONFIG_ENCODERS |
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static uint32_t read_long(const unsigned char *p) |
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{ |
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return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3]; |
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} |
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int is_adx(const unsigned char *buf,size_t bufsize) |
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{ |
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int offset; |
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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 offset; |
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} |
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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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{ |
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int offset; |
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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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channels = buf[7]; |
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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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return offset; |
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} |
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static int adx_decode_init(AVCodecContext * avctx) |
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{ |
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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->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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c->header_parsed = 0; |
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c->in_temp = 0; |
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return 0; |
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} |
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#if 0 |
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static void dump(unsigned char *buf,size_t len) |
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{ |
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int i; |
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for(i=0;i<len;i++) { |
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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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} |
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av_log(NULL, AV_LOG_ERROR, "\n"); |
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} |
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#endif |
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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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{ |
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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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int rest = buf_size; |
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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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buf += hdrsize; |
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rest -= hdrsize; |
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} |
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if (c->in_temp) { |
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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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rest -= copysize; |
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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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samples += 32; |
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} else { |
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adx_decode_stereo(samples,c->dec_temp,c->prev); |
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samples += 32*2; |
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} |
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} |
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// |
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if (avctx->channels==1) { |
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while(rest>=18) { |
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adx_decode(samples,buf,c->prev); |
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rest-=18; |
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buf+=18; |
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samples+=32; |
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} |
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} else { |
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while(rest>=18*2) { |
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adx_decode_stereo(samples,buf,c->prev); |
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rest-=18*2; |
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buf+=18*2; |
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samples+=32*2; |
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} |
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} |
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// |
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c->in_temp = rest; |
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if (rest) { |
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memcpy(c->dec_temp,buf,rest); |
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buf+=rest; |
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} |
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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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return buf-buf0; |
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} |
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#ifdef CONFIG_ENCODERS |
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AVCodec adx_adpcm_encoder = { |
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"adx_adpcm", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_ADPCM_ADX, |
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sizeof(ADXContext), |
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adx_encode_init, |
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adx_encode_frame, |
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adx_encode_close, |
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NULL, |
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}; |
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#endif //CONFIG_ENCODERS |
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AVCodec adx_adpcm_decoder = { |
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"adx_adpcm", |
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CODEC_TYPE_AUDIO, |
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CODEC_ID_ADPCM_ADX, |
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sizeof(ADXContext), |
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adx_decode_init, |
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NULL, |
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NULL, |
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adx_decode_frame, |
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}; |
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