3 * Copyright (c) 2001,2003 BERO
5 * This file is part of FFmpeg.
7 * FFmpeg is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
12 * FFmpeg is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 #include "libavutil/intreadwrite.h"
28 * SEGA CRI adx codecs.
30 * Reference documents:
31 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
32 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
35 /* 18 bytes <-> 32 samples */
37 static void adx_encode(unsigned char *adx,const short *wav,PREV *prev)
50 d = ((s0<<14) - SCALE1*s1 + SCALE2*s2)/BASEVOL;
62 if (max==0 && min==0) {
67 if (max/7>-min/8) scale = max/7;
70 if (scale==0) scale=1;
75 adx[i+2] = ((data[i*2]/scale)<<4) | ((data[i*2+1]/scale)&0xf);
79 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
83 uint32_t offset; /* 0x80000000 + sample start - 4 */
84 unsigned char unknown1[3]; /* 03 12 04 */
85 unsigned char channel; /* 1 or 2 */
88 uint32_t unknown2; /* 01 f4 03 00 */
89 uint32_t unknown3; /* 00 00 00 00 */
90 uint32_t unknown4; /* 00 00 00 00 */
95 long loop_start_sample;
101 } adxhdr; /* big endian */
102 /* offset-6 "(c)CRI" */
104 AV_WB32(buf+0x00,0x80000000|0x20);
105 AV_WB32(buf+0x04,0x03120400|avctx->channels);
106 AV_WB32(buf+0x08,avctx->sample_rate);
107 AV_WB32(buf+0x0c,0); /* FIXME: set after */
108 AV_WB32(buf+0x10,0x01040300);
109 AV_WB32(buf+0x14,0x00000000);
110 AV_WB32(buf+0x18,0x00000000);
111 memcpy(buf+0x1c,"\0\0(c)CRI",8);
115 static av_cold int adx_encode_init(AVCodecContext *avctx)
117 if (avctx->channels > 2)
118 return -1; /* only stereo or mono =) */
119 avctx->frame_size = 32;
121 avctx->coded_frame= avcodec_alloc_frame();
122 avctx->coded_frame->key_frame= 1;
124 // avctx->bit_rate = avctx->sample_rate*avctx->channels*18*8/32;
126 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
131 static av_cold int adx_encode_close(AVCodecContext *avctx)
133 av_freep(&avctx->coded_frame);
138 static int adx_encode_frame(AVCodecContext *avctx,
139 uint8_t *frame, int buf_size, void *data)
141 ADXContext *c = avctx->priv_data;
142 const short *samples = data;
143 unsigned char *dst = frame;
144 int rest = avctx->frame_size;
148 ffmpeg.c: do_audio_out()
149 frame_bytes = enc->frame_size * 2 * enc->channels;
152 // printf("sz=%d ",buf_size); fflush(stdout);
153 if (!c->header_parsed) {
154 int hdrsize = adx_encode_header(avctx,dst,buf_size);
156 c->header_parsed = 1;
159 if (avctx->channels==1) {
161 adx_encode(dst,samples,c->prev);
172 tmpbuf[i] = samples[i*2];
173 tmpbuf[i+32] = samples[i*2+1];
176 adx_encode(dst,tmpbuf,c->prev);
177 adx_encode(dst+18,tmpbuf+32,c->prev+1);
186 AVCodec adpcm_adx_encoder = {
195 .sample_fmts = (const enum SampleFormat[]){SAMPLE_FMT_S16,SAMPLE_FMT_NONE},
196 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),