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
24 #include "bytestream.h"
30 * SEGA CRI adx codecs.
32 * Reference documents:
33 * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
34 * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
37 static void adx_encode(ADXContext *c, uint8_t *adx, const int16_t *wav,
38 ADXChannelState *prev, int channels)
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;
60 if (max == 0 && min == 0) {
63 memset(adx, 0, BLOCK_SIZE);
67 if (max / 7 > -min / 8)
77 init_put_bits(&pb, adx + 2, 16);
81 for (i = 0, j = 0; j < 32; i += channels, j++) {
82 d = ((wav[i] << COEFF_BITS) - c->coeff[0] * s1 - c->coeff[1] * s2) >> COEFF_BITS;
84 d = av_clip_intp2(ROUNDED_DIV(d, scale), 3);
88 s0 = ((d << COEFF_BITS) * scale + c->coeff[0] * s1 + c->coeff[1] * s2) >> COEFF_BITS;
98 #define HEADER_SIZE 36
100 static int adx_encode_header(AVCodecContext *avctx, uint8_t *buf, int bufsize)
102 ADXContext *c = avctx->priv_data;
104 bytestream_put_be16(&buf, 0x8000); /* header signature */
105 bytestream_put_be16(&buf, HEADER_SIZE - 4); /* copyright offset */
106 bytestream_put_byte(&buf, 3); /* encoding */
107 bytestream_put_byte(&buf, BLOCK_SIZE); /* block size */
108 bytestream_put_byte(&buf, 4); /* sample size */
109 bytestream_put_byte(&buf, avctx->channels); /* channels */
110 bytestream_put_be32(&buf, avctx->sample_rate); /* sample rate */
111 bytestream_put_be32(&buf, 0); /* total sample count */
112 bytestream_put_be16(&buf, c->cutoff); /* cutoff frequency */
113 bytestream_put_byte(&buf, 3); /* version */
114 bytestream_put_byte(&buf, 0); /* flags */
115 bytestream_put_be32(&buf, 0); /* unknown */
116 bytestream_put_be32(&buf, 0); /* loop enabled */
117 bytestream_put_be16(&buf, 0); /* padding */
118 bytestream_put_buffer(&buf, "(c)CRI", 6); /* copyright signature */
123 static av_cold int adx_encode_init(AVCodecContext *avctx)
125 ADXContext *c = avctx->priv_data;
127 if (avctx->channels > 2) {
128 av_log(avctx, AV_LOG_ERROR, "Invalid number of channels\n");
129 return AVERROR(EINVAL);
131 avctx->frame_size = BLOCK_SAMPLES;
133 /* the cutoff can be adjusted, but this seems to work pretty well */
135 ff_adx_calculate_coeffs(c->cutoff, avctx->sample_rate, COEFF_BITS, c->coeff);
140 static int adx_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
141 const AVFrame *frame, int *got_packet_ptr)
143 ADXContext *c = avctx->priv_data;
144 const int16_t *samples = (const int16_t *)frame->data[0];
146 int ch, out_size, ret;
148 out_size = BLOCK_SIZE * avctx->channels + !c->header_parsed * HEADER_SIZE;
149 if ((ret = ff_alloc_packet2(avctx, avpkt, out_size)) < 0)
153 if (!c->header_parsed) {
155 if ((hdrsize = adx_encode_header(avctx, dst, avpkt->size)) < 0) {
156 av_log(avctx, AV_LOG_ERROR, "output buffer is too small\n");
157 return AVERROR(EINVAL);
160 c->header_parsed = 1;
163 for (ch = 0; ch < avctx->channels; ch++) {
164 adx_encode(c, dst, samples + ch, &c->prev[ch], avctx->channels);
172 AVCodec ff_adpcm_adx_encoder = {
174 .long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
175 .type = AVMEDIA_TYPE_AUDIO,
176 .id = AV_CODEC_ID_ADPCM_ADX,
177 .priv_data_size = sizeof(ADXContext),
178 .init = adx_encode_init,
179 .encode2 = adx_encode_frame,
180 .sample_fmts = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16,
181 AV_SAMPLE_FMT_NONE },