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
24 #include "bytestream.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, uint8_t *adx, const int16_t *wav,
37 ADXChannelState *prev, int channels)
45 int data[BLOCK_SAMPLES];
49 for (i = 0, j = 0; j < 32; i += channels, j++) {
51 d = ((s0 << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
63 if (max == 0 && min == 0) {
64 memset(adx, 0, BLOCK_SIZE);
68 if (max / 7 > -min / 8)
78 init_put_bits(&pb, adx + 2, 16);
79 for (i = 0; i < BLOCK_SAMPLES; i++)
80 put_sbits(&pb, 4, av_clip(data[i] / scale, -8, 7));
84 #define HEADER_SIZE 36
86 static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
88 ADXContext *c = avctx->priv_data;
90 if (bufsize < HEADER_SIZE)
91 return AVERROR(EINVAL);
93 bytestream_put_be16(&buf, 0x8000); /* header signature */
94 bytestream_put_be16(&buf, HEADER_SIZE - 4); /* copyright offset */
95 bytestream_put_byte(&buf, 3); /* encoding */
96 bytestream_put_byte(&buf, BLOCK_SIZE); /* block size */
97 bytestream_put_byte(&buf, 4); /* sample size */
98 bytestream_put_byte(&buf, avctx->channels); /* channels */
99 bytestream_put_be32(&buf, avctx->sample_rate); /* sample rate */
100 bytestream_put_be32(&buf, 0); /* total sample count */
101 bytestream_put_be16(&buf, c->cutoff); /* cutoff frequency */
102 bytestream_put_byte(&buf, 3); /* version */
103 bytestream_put_byte(&buf, 0); /* flags */
104 bytestream_put_be32(&buf, 0); /* unknown */
105 bytestream_put_be32(&buf, 0); /* loop enabled */
106 bytestream_put_be16(&buf, 0); /* padding */
107 bytestream_put_buffer(&buf, "(c)CRI", 6); /* copyright signature */
112 static av_cold int adx_encode_init(AVCodecContext *avctx)
114 ADXContext *c = avctx->priv_data;
116 if (avctx->channels > 2) {
117 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
118 return AVERROR(EINVAL);
120 avctx->frame_size = BLOCK_SAMPLES;
122 avcodec_get_frame_defaults(&c->frame);
123 avctx->coded_frame = &c->frame;
125 /* the cutoff can be adjusted, but this seems to work pretty well */
127 ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
132 static int adx_encode_frame(AVCodecContext *avctx, uint8_t *frame,
133 int buf_size, void *data)
135 ADXContext *c = avctx->priv_data;
136 const int16_t *samples = data;
137 uint8_t *dst = frame;
140 if (!c->header_parsed) {
142 if ((hdrsize = adx_encode_header(avctx, dst, buf_size)) < 0) {
143 av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
144 return AVERROR(EINVAL);
148 c->header_parsed = 1;
150 if (buf_size < BLOCK_SIZE * avctx->channels) {
151 av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
152 return AVERROR(EINVAL);
155 for (ch = 0; ch < avctx->channels; ch++) {
156 adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
162 AVCodec ff_adpcm_adx_encoder = {
164 .type = AVMEDIA_TYPE_AUDIO,
165 .id = CODEC_ID_ADPCM_ADX,
166 .priv_data_size = sizeof(ADXContext),
167 .init = adx_encode_init,
168 .encode = adx_encode_frame,
169 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
170 AV_SAMPLE_FMT_NONE },
171 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),