From c31dea6136df692a3b0a3fcf490696b718fe9a05 Mon Sep 17 00:00:00 2001 From: Aurelien Jacobs Date: Thu, 1 Nov 2007 18:38:15 +0000 Subject: split adx encoder in its own file Originally committed as revision 10903 to svn://svn.ffmpeg.org/ffmpeg/trunk --- libavcodec/adxenc.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 193 insertions(+) create mode 100644 libavcodec/adxenc.c (limited to 'libavcodec/adxenc.c') diff --git a/libavcodec/adxenc.c b/libavcodec/adxenc.c new file mode 100644 index 0000000000..4c3d74e3b2 --- /dev/null +++ b/libavcodec/adxenc.c @@ -0,0 +1,193 @@ +/* + * 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 (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; + + 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, +}; -- cgit v1.2.3