/* * 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" #include "adx.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/ */ /* 18 bytes <-> 32 samples */ 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 (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); } } 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 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_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"); 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; } AVCodec adpcm_adx_encoder = { "adpcm_adx", CODEC_TYPE_AUDIO, CODEC_ID_ADPCM_ADX, sizeof(ADXContext), adx_encode_init, adx_encode_frame, adx_encode_close, NULL, };