2003-10-14 06:40:53 +02:00
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/*
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* ADX ADPCM codecs
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* Copyright (c) 2001,2003 BERO
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*
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2011-03-18 18:35:10 +01:00
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* This file is part of Libav.
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2006-10-07 17:30:46 +02:00
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*
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2011-03-18 18:35:10 +01:00
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* Libav is free software; you can redistribute it and/or
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2003-10-14 06:40:53 +02:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2003-10-14 06:40:53 +02:00
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*
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2011-03-18 18:35:10 +01:00
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* Libav is distributed in the hope that it will be useful,
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2003-10-14 06:40:53 +02:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2011-03-18 18:35:10 +01:00
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* License along with Libav; if not, write to the Free Software
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2006-01-12 23:43:26 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2003-10-14 06:40:53 +02:00
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*/
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2009-01-11 23:19:48 +01:00
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#include "libavutil/intreadwrite.h"
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2003-10-14 06:40:53 +02:00
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#include "avcodec.h"
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2007-11-01 19:38:15 +01:00
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#include "adx.h"
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2003-10-14 06:40:53 +02:00
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/**
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2010-04-20 16:45:34 +02:00
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* @file
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2003-10-14 06:40:53 +02:00
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* SEGA CRI adx codecs.
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*
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* Reference documents:
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* http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
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* adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
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*/
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2008-08-17 19:08:25 +02:00
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static av_cold int adx_decode_init(AVCodecContext *avctx)
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2008-07-31 12:47:31 +02:00
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{
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2010-11-12 12:04:40 +01:00
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avctx->sample_fmt = AV_SAMPLE_FMT_S16;
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2008-07-31 12:47:31 +02:00
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return 0;
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}
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2011-11-19 23:46:15 +01:00
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/**
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* Decode 32 samples from 18 bytes.
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*
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* A 16-bit scalar value is applied to 32 residuals, which then have a
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* 2nd-order LPC filter applied to it to form the output signal for a single
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* channel.
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*/
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2011-11-20 18:46:41 +01:00
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static void adx_decode(ADXContext *c, int16_t *out, const uint8_t *in, int ch)
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2003-10-14 06:40:53 +02:00
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{
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2011-11-20 18:46:41 +01:00
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ADXChannelState *prev = &c->prev[ch];
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2007-05-23 16:55:13 +02:00
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int scale = AV_RB16(in);
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2003-10-15 05:14:14 +02:00
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int i;
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2011-11-19 23:46:15 +01:00
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int s0, s1, s2, d;
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2003-10-15 05:14:14 +02:00
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2011-11-19 23:46:15 +01:00
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in += 2;
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2003-10-15 05:14:14 +02:00
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s1 = prev->s1;
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s2 = prev->s2;
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2011-11-19 23:46:15 +01:00
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for (i = 0; i < 16; i++) {
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d = in[i];
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d = (signed char)d >> 4;
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s0 = (BASEVOL * d * scale + SCALE1 * s1 - SCALE2 * s2) >> 14;
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2003-10-15 05:14:14 +02:00
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s2 = s1;
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2007-08-12 01:17:03 +02:00
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s1 = av_clip_int16(s0);
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2011-11-20 18:46:41 +01:00
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*out = s1;
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out += c->channels;
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2003-10-15 05:14:14 +02:00
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2011-11-19 23:46:15 +01:00
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d = in[i];
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d = (signed char)(d << 4) >> 4;
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s0 = (BASEVOL * d * scale + SCALE1 * s1 - SCALE2 * s2) >> 14;
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2003-10-15 05:14:14 +02:00
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s2 = s1;
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2007-08-12 01:17:03 +02:00
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s1 = av_clip_int16(s0);
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2011-11-20 18:46:41 +01:00
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*out = s1;
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out += c->channels;
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2003-10-15 05:14:14 +02:00
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}
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prev->s1 = s1;
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prev->s2 = s2;
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2003-10-14 06:40:53 +02:00
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}
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2011-11-19 23:46:15 +01:00
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/**
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* Decode stream header.
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*
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* @param avctx codec context
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* @param buf packet data
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* @param bufsize packet size
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2011-11-19 23:51:36 +01:00
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* @return data offset or negative error code if header is invalid
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2011-11-19 23:46:15 +01:00
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*/
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static int adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
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int bufsize)
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2003-10-14 06:40:53 +02:00
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{
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2011-11-20 18:46:41 +01:00
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ADXContext *c = avctx->priv_data;
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2007-11-01 18:58:03 +01:00
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int offset;
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2003-10-14 06:40:53 +02:00
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2011-11-20 18:57:21 +01:00
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if (AV_RB16(buf) != 0x8000)
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2011-11-19 23:51:36 +01:00
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return AVERROR_INVALIDDATA;
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2011-11-20 18:57:21 +01:00
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offset = AV_RB16(buf + 2) + 4;
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2011-11-19 23:46:15 +01:00
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if (bufsize < offset || memcmp(buf + offset - 6, "(c)CRI", 6))
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return AVERROR_INVALIDDATA;
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2011-11-20 18:46:41 +01:00
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c->channels = avctx->channels = buf[7];
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2011-11-19 23:51:36 +01:00
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if (avctx->channels > 2)
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return AVERROR_INVALIDDATA;
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2011-11-19 23:46:15 +01:00
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avctx->sample_rate = AV_RB32(buf + 8);
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2011-11-19 23:51:36 +01:00
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if (avctx->sample_rate < 1 ||
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avctx->sample_rate > INT_MAX / (avctx->channels * 18 * 8))
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return AVERROR_INVALIDDATA;
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2011-11-19 23:46:15 +01:00
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avctx->bit_rate = avctx->sample_rate * avctx->channels * 18 * 8 / 32;
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2003-10-14 06:40:53 +02:00
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2003-10-15 05:14:14 +02:00
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return offset;
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2003-10-14 06:40:53 +02:00
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}
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2011-11-19 23:46:15 +01:00
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static int adx_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt)
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2003-10-14 06:40:53 +02:00
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{
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2009-04-07 17:59:50 +02:00
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const uint8_t *buf0 = avpkt->data;
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2011-11-19 23:46:15 +01:00
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int buf_size = avpkt->size;
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ADXContext *c = avctx->priv_data;
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int16_t *samples = data;
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const uint8_t *buf = buf0;
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int rest = buf_size;
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2003-10-15 05:14:14 +02:00
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if (!c->header_parsed) {
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2011-11-19 23:46:15 +01:00
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int hdrsize = adx_decode_header(avctx, buf, rest);
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2011-11-19 23:51:36 +01:00
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if (hdrsize < 0) {
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av_log(avctx, AV_LOG_ERROR, "invalid stream header\n");
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return hdrsize;
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}
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2003-10-15 05:14:14 +02:00
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c->header_parsed = 1;
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buf += hdrsize;
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rest -= hdrsize;
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}
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2007-09-24 05:32:24 +02:00
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/* 18 bytes of data are expanded into 32*2 bytes of audio,
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so guard against buffer overflows */
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2011-11-19 23:46:15 +01:00
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if (rest / 18 > *data_size / 64)
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rest = (*data_size / 64) * 18;
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2007-09-24 05:32:24 +02:00
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2003-10-15 05:14:14 +02:00
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if (c->in_temp) {
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2011-11-19 23:46:15 +01:00
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int copysize = 18 * avctx->channels - c->in_temp;
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memcpy(c->dec_temp + c->in_temp, buf, copysize);
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2003-10-15 05:14:14 +02:00
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rest -= copysize;
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buf += copysize;
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2011-11-20 18:46:41 +01:00
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adx_decode(c, samples, c->dec_temp, 0);
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if (avctx->channels == 2)
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adx_decode(c, samples + 1, c->dec_temp + 18, 1);
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samples += 32 * c->channels;
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2003-10-15 05:14:14 +02:00
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}
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2011-11-19 23:07:46 +01:00
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2011-11-20 18:46:41 +01:00
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while (rest >= 18 * c->channels) {
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adx_decode(c, samples, buf, 0);
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if (c->channels == 2)
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adx_decode(c, samples + 1, buf + 18, 1);
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rest -= 18 * c->channels;
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buf += 18 * c->channels;
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samples += 32 * c->channels;
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2003-10-15 05:14:14 +02:00
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}
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2011-11-19 23:07:46 +01:00
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2003-10-15 05:14:14 +02:00
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c->in_temp = rest;
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if (rest) {
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2011-11-19 23:46:15 +01:00
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memcpy(c->dec_temp, buf, rest);
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buf += rest;
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2003-10-15 05:14:14 +02:00
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}
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*data_size = (uint8_t*)samples - (uint8_t*)data;
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2011-11-19 23:46:15 +01:00
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return buf - buf0;
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2003-10-14 06:40:53 +02:00
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}
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2011-01-25 22:40:11 +01:00
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AVCodec ff_adpcm_adx_decoder = {
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2011-07-17 12:54:31 +02:00
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.name = "adpcm_adx",
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.type = AVMEDIA_TYPE_AUDIO,
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.id = CODEC_ID_ADPCM_ADX,
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.priv_data_size = sizeof(ADXContext),
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.init = adx_decode_init,
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.decode = adx_decode_frame,
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2011-11-19 23:46:15 +01:00
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.long_name = NULL_IF_CONFIG_SMALL("SEGA CRI ADX ADPCM"),
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2003-10-14 06:40:53 +02:00
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};
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