3 * Copyright (c) 2001,2003 BERO
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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"
29 * SEGA CRI adx codecs.
31 * Reference documents:
32 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
33 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
36 static void adx_encode(ADXContext *c, unsigned char *adx, const short *wav,
37 ADXChannelState *prev)
51 d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
61 if (max==0 && min==0) {
66 if (max/7>-min/8) scale = max/7;
69 if (scale==0) scale=1;
73 init_put_bits(&pb, adx + 2, 16);
74 for (i = 0; i < 32; i++)
75 put_sbits(&pb, 4, av_clip(data[i]/scale, -8, 7));
79 static int adx_encode_header(AVCodecContext *avctx,unsigned char *buf,size_t bufsize)
81 ADXContext *c = avctx->priv_data;
83 AV_WB32(buf+0x00,0x80000000|0x20);
84 AV_WB32(buf+0x04,0x03120400|avctx->channels);
85 AV_WB32(buf+0x08,avctx->sample_rate);
87 AV_WB16(buf + 0x10, c->cutoff);
88 AV_WB32(buf + 0x12, 0x03000000);
89 AV_WB32(buf + 0x16, 0x00000000);
90 AV_WB32(buf + 0x1a, 0x00000000);
91 memcpy (buf + 0x1e, "(c)CRI", 6);
95 static av_cold int adx_encode_init(AVCodecContext *avctx)
97 ADXContext *c = avctx->priv_data;
99 if (avctx->channels > 2)
101 avctx->frame_size = 32;
103 avctx->coded_frame= avcodec_alloc_frame();
104 avctx->coded_frame->key_frame= 1;
106 /* the cutoff can be adjusted, but this seems to work pretty well */
108 ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
110 av_log(avctx, AV_LOG_DEBUG, "adx encode init\n");
115 static av_cold int adx_encode_close(AVCodecContext *avctx)
117 av_freep(&avctx->coded_frame);
122 static int adx_encode_frame(AVCodecContext *avctx,
123 uint8_t *frame, int buf_size, void *data)
125 ADXContext *c = avctx->priv_data;
126 const short *samples = data;
127 unsigned char *dst = frame;
128 int rest = avctx->frame_size;
130 if (!c->header_parsed) {
131 int hdrsize = adx_encode_header(avctx,dst,buf_size);
133 c->header_parsed = 1;
136 if (avctx->channels==1) {
138 adx_encode(c, dst, samples, c->prev);
149 tmpbuf[i] = samples[i*2];
150 tmpbuf[i+32] = samples[i*2+1];
153 adx_encode(c, dst, tmpbuf, c->prev);
154 adx_encode(c, dst + 18, tmpbuf + 32, c->prev + 1);
163 AVCodec ff_adpcm_adx_encoder = {
165 .type = AVMEDIA_TYPE_AUDIO,
166 .id = CODEC_ID_ADPCM_ADX,
167 .priv_data_size = sizeof(ADXContext),
168 .init = adx_encode_init,
169 .encode = adx_encode_frame,
170 .close = adx_encode_close,
171 .sample_fmts = (const enum AVSampleFormat[]){AV_SAMPLE_FMT_S16,AV_SAMPLE_FMT_NONE},
172 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),