From f5610466860a3db493a97ba816a0b9d71d03a949 Mon Sep 17 00:00:00 2001 From: Mike Melanson Date: Tue, 14 Oct 2003 04:40:53 +0000 Subject: added CRI ADX and XA ADPCM audio modules, courtesy of BERO Originally committed as revision 2376 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/adx.c | 412 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 412 insertions(+) create mode 100644 libavcodec/adx.c (limited to 'libavcodec/adx.c') diff --git a/libavcodec/adx.c b/libavcodec/adx.c new file mode 100644 index 0000000000..d6d6fdd281 --- /dev/null +++ b/libavcodec/adx.c @@ -0,0 +1,412 @@ +/* + * ADX ADPCM codecs + * Copyright (c) 2001,2003 BERO + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include "avcodec.h" + +/** + * @file adx.c + * SEGA CRI adx codecs. + * + * Reference documents: + * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html + * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/ + */ + +typedef struct { + int s1,s2; +} PREV; + +typedef struct { + PREV prev[2]; + int header_parsed; + unsigned char dec_temp[18*2]; + unsigned short enc_temp[32*2]; + int in_temp; +} ADXContext; + +//#define BASEVOL 0x11e0 +#define BASEVOL 0x4000 +#define SCALE1 0x7298 +#define SCALE2 0x3350 + +#define CLIP(s) if (s>32767) s=32767; else if (s<-32768) s=-32768 + +/* 18byte <-> 32 samples */ + +#ifdef CONFIG_ENCODERS +static void adx_encode(unsigned char *adx,const short *wav,PREV *prev) +{ + int scale; + int i; + int s0,s1,s2,d; + int max=0; + int min=0; + int data[32]; + + s1 = prev->s1; + s2 = prev->s2; + for(i=0;i<32;i++) { + s0 = wav[i]; + d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL; + data[i]=d; + if (maxd) min=d; + s2 = s1; + s1 = s0; + } + prev->s1 = s1; + prev->s2 = s2; + + /* -8..+7 */ + + if (max==0 && min==0) { + memset(adx,0,18); + return; + } + + if (max/7>-min/8) scale = max/7; + else scale = -min/8; + + if (scale==0) scale=1; + + adx[0] = scale>>8; + adx[1] = scale; + + for(i=0;i<16;i++) { + adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf); + } +} +#endif //CONFIG_ENCODERS + +static void adx_decode(short *out,const unsigned char *in,PREV *prev) +{ + int scale = ((in[0]<<8)|(in[1])); + int i; + int s0,s1,s2,d; + +// printf("%x ",scale); + + in+=2; + s1 = prev->s1; + s2 = prev->s2; + for(i=0;i<16;i++) { + d = in[i]; + // d>>=4; if (d&8) d-=16; + d = ((signed char)d >> 4); + s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14; + CLIP(s0); + *out++=s0; + s2 = s1; + s1 = s0; + + d = in[i]; + //d&=15; if (d&8) d-=16; + d = ((signed char)(d<<4) >> 4); + s0 = (BASEVOL*d*scale + SCALE1*s1 - SCALE2*s2)>>14; + CLIP(s0); + *out++=s0; + s2 = s1; + s1 = s0; + } + prev->s1 = s1; + prev->s2 = s2; + +} + +static void adx_decode_stereo(short *out,const unsigned char *in,PREV *prev) +{ + short tmp[32*2]; + int i; + + adx_decode(tmp ,in ,prev); + adx_decode(tmp+32,in+18,prev+1); + for(i=0;i<32;i++) { + out[i*2] = tmp[i]; + out[i*2+1] = tmp[i+32]; + } +} + +#ifdef CONFIG_ENCODERS + +static void write_long(unsigned char *p,uint32_t v) +{ + p[0] = v>>24; + p[1] = v>>16; + p[2] = v>>8; + p[3] = v; +} + +static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize) +{ +#if 0 + struct { + uint32_t offset; /* 0x80000000 + sample start - 4 */ + unsigned char unknown1[3]; /* 03 12 04 */ + unsigned char channel; /* 1 or 2 */ + uint32_t freq; + uint32_t size; + uint32_t unknown2; /* 01 f4 03 00 */ + uint32_t unknown3; /* 00 00 00 00 */ + uint32_t unknown4; /* 00 00 00 00 */ + + /* if loop + unknown3 00 15 00 01 + unknown4 00 00 00 01 + long loop_start_sample; + long loop_start_byte; + long loop_end_sample; + long loop_end_byte; + long + */ + } adxhdr; /* big endian */ + /* offset-6 "(c)CRI" */ +#endif + write_long(buf+0x00,0x80000000|0x20); + write_long(buf+0x04,0x03120400|avctx->channels); + write_long(buf+0x08,avctx->sample_rate); + write_long(buf+0x0c,0); /* FIXME: set after */ + write_long(buf+0x10,0x01040300); + write_long(buf+0x14,0x00000000); + write_long(buf+0x18,0x00000000); + memcpy(buf+0x1c,"\0\0(c)CRI",8); + return 0x20+4; +} + +static int adx_decode_init(AVCodecContext *avctx); +static int adx_encode_init(AVCodecContext *avctx) +{ + if (avctx->channels > 2) + return -1; /* only stereo or mono =) */ + avctx->frame_size = 32; + + avctx->coded_frame= avcodec_alloc_frame(); + avctx->coded_frame->key_frame= 1; + +// avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32; + + printf("adx encode init\n"); fflush(stdout); + adx_decode_init(avctx); + + return 0; +} + +static int adx_encode_close(AVCodecContext *avctx) +{ + av_freep(&avctx->coded_frame); + + return 0; +} + +static int adx_encode_frame(AVCodecContext *avctx, + unsigned char *frame, int buf_size, const void *data) +{ + ADXContext *c = avctx->priv_data; + const short *samples = data; + unsigned char *dst = frame; + int rest = avctx->frame_size; + +/* + input data size = + ffmpeg.c: do_audio_out() + frame_bytes = enc->frame_size * 2 * enc->channels; +*/ + +// printf("sz=%d ",buf_size); fflush(stdout); + if (!c->header_parsed) { + int hdrsize = adx_encode_header(avctx,dst,buf_size); + dst+=hdrsize; + c->header_parsed = 1; + } + + if (avctx->channels==1) { + while(rest>=32) { + adx_encode(dst,samples,c->prev); + dst+=18; + samples+=32; + rest-=32; + } + } else { + while(rest>=32*2) { + short tmpbuf[32*2]; + int i; + + for(i=0;i<32;i++) { + tmpbuf[i] = samples[i*2]; + tmpbuf[i+32] = samples[i*2+1]; + } + + adx_encode(dst,tmpbuf,c->prev); + adx_encode(dst+18,tmpbuf+32,c->prev+1); + dst+=18*2; + samples+=32*2; + rest-=32*2; + } + } + return dst-frame; +} + +#endif //CONFIG_ENCODERS + +static uint32_t read_long(const unsigned char *p) +{ + return (p[0]<<24)|(p[1]<<16)|(p[2]<<8)|p[3]; +} + +int is_adx(const unsigned char *buf,size_t bufsize) +{ + int offset; + + if (buf[0]!=0x80) return 0; + offset = (read_long(buf)^0x80000000)+4; + if (bufsizesample_rate = freq; + avctx->channels = channels; + avctx->bit_rate = freq*channels*18*8/32; +// avctx->frame_size = 18*channels; + + return offset; +} + +static int adx_decode_init(AVCodecContext * avctx) +{ + ADXContext *c = avctx->priv_data; + +// printf("adx_decode_init\n"); fflush(stdout); + c->prev[0].s1 = 0; + c->prev[0].s2 = 0; + c->prev[1].s1 = 0; + c->prev[1].s2 = 0; + c->header_parsed = 0; + c->in_temp = 0; + return 0; +} + +static void dump(unsigned char *buf,size_t len) +{ + int i; + for(i=0;ipriv_data; + short *samples = data; + const uint8_t *buf = buf0; + int rest = buf_size; + + if (!c->header_parsed) { + int hdrsize = adx_decode_header(avctx,buf,rest); + if (hdrsize==0) return -1; + c->header_parsed = 1; + buf += hdrsize; + rest -= hdrsize; + } + + if (c->in_temp) { + int copysize = 18*avctx->channels - c->in_temp; + memcpy(c->dec_temp+c->in_temp,buf,copysize); + rest -= copysize; + buf += copysize; + if (avctx->channels==1) { + adx_decode(samples,c->dec_temp,c->prev); + samples += 32; + } else { + adx_decode_stereo(samples,c->dec_temp,c->prev); + samples += 32*2; + } + } + // + if (avctx->channels==1) { + while(rest>=18) { + adx_decode(samples,buf,c->prev); + rest-=18; + buf+=18; + samples+=32; + } + } else { + while(rest>=18*2) { + adx_decode_stereo(samples,buf,c->prev); + rest-=18*2; + buf+=18*2; + samples+=32*2; + } + } + // + c->in_temp = rest; + if (rest) { + memcpy(c->dec_temp,buf,rest); + buf+=rest; + } + *data_size = (uint8_t*)samples - (uint8_t*)data; +// printf("%d:%d ",buf-buf0,*data_size); fflush(stdout); + return buf-buf0; +} + +#define DEFINE_ENCODER(id, name, context) \ +AVCodec name ## _encoder = { \ + #name, \ + CODEC_TYPE_AUDIO, \ + id, \ + sizeof(context), \ + name ## _encode_init, \ + name ## _encode_frame, \ + name ## _encode_close, \ + NULL, \ +}; + +#define DEFINE_DECODER(id, name, context) \ +AVCodec name ## _decoder = { \ + #name, \ + CODEC_TYPE_AUDIO, \ + id, \ + sizeof(context), \ + name ## _decode_init, \ + NULL, \ + NULL, \ + name ## _decode_frame, \ +}; + +#ifdef CONFIG_ENCODERS +DEFINE_ENCODER(CODEC_ID_ADPCM_ADX,adx,ADXContext) +#endif //CONFIG_ENCODERS + +DEFINE_DECODER(CODEC_ID_ADPCM_ADX,adx,ADXContext) -- cgit v1.2.3