/* * ADX ADPCM codecs * Copyright (c) 2001,2003 BERO * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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/ */#undef memcpy#define memcpy uc_memcpytypedef 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/* 18 bytes <-> 32 samples */#ifdef CONFIG_ENCODERSstatic 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 (max<d) max=d;        if (min>d) 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;    AV_WB16(adx, scale);    for(i=0;i<16;i++) {        adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);    }}#endif //CONFIG_ENCODERSstatic void adx_decode(short *out,const unsigned char *in,PREV *prev){    int scale = AV_RB16(in);    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;        s2 = s1;        s1 = av_clip_int16(s0);        *out++=s1;        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;        s2 = s1;        s1 = av_clip_int16(s0);        *out++=s1;    }    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_ENCODERSstatic 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    AV_WB32(buf+0x00,0x80000000|0x20);    AV_WB32(buf+0x04,0x03120400|avctx->channels);    AV_WB32(buf+0x08,avctx->sample_rate);    AV_WB32(buf+0x0c,0); /* FIXME: set after */    AV_WB32(buf+0x10,0x01040300);    AV_WB32(buf+0x14,0x00000000);    AV_WB32(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;    av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");    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,                uint8_t *frame, int buf_size, 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_ENCODERSstatic int is_adx(const unsigned char *buf,size_t bufsize){    int    offset;    if (buf[0]!=0x80) return 0;    offset = (AV_RB32(buf)^0x80000000)+4;    if (bufsize<offset || memcmp(buf+offset-6,"(c)CRI",6)) return 0;    return offset;}/* return data offset or 6 */static int adx_decode_header(AVCodecContext *avctx,const unsigned char *buf,size_t bufsize){    int offset;    int channels,freq,size;    offset = is_adx(buf,bufsize);    if (offset==0) return 0;    channels = buf[7];    freq = AV_RB32(buf+8);    size = AV_RB32(buf+12);//    printf("freq=%d ch=%d\n",freq,channels);    avctx->sample_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;}#if 0static void dump(unsigned char *buf,size_t len){    int i;    for(i=0;i<len;i++) {        if ((i&15)==0) av_log(NULL, AV_LOG_DEBUG, "%04x  ",i);        av_log(NULL, AV_LOG_DEBUG, "%02x ",buf[i]);        if ((i&15)==15) av_log(NULL, AV_LOG_DEBUG, "\n");    }    av_log(NULL, AV_LOG_ERROR, "\n");}#endifstatic int adx_decode_frame(AVCodecContext *avctx,                void *data, int *data_size,                uint8_t *buf0, int buf_size){    ADXContext *c = avctx->priv_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;    }    /* 18 bytes of data are expanded into 32*2 bytes of audio,       so guard against buffer overflows */    if(rest/18 > *data_size/64)        rest = (*data_size/64) * 18;    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;}#ifdef CONFIG_ENCODERSAVCodec adpcm_adx_encoder = {    "adpcm_adx",    CODEC_TYPE_AUDIO,    CODEC_ID_ADPCM_ADX,    sizeof(ADXContext),    adx_encode_init,    adx_encode_frame,    adx_encode_close,    NULL,};#endif //CONFIG_ENCODERSAVCodec adpcm_adx_decoder = {    "adpcm_adx",    CODEC_TYPE_AUDIO,    CODEC_ID_ADPCM_ADX,    sizeof(ADXContext),    adx_decode_init,    NULL,    NULL,    adx_decode_frame,};