ffmpeg-2.1.1: move directory

git-svn-id: svn://kolibrios.org@6148 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/ffmpeg/ffmpeg-2.1/libavcodec/adx.h

@@ -0,0 +1,80 @@
+/*
+ * ADX ADPCM codecs
+ * Copyright (c) 2001,2003 BERO
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * SEGA CRI adx codecs.
+ *
+ * Reference documents:
+ * http://ku-www.ss.titech.ac.jp/~yatsushi/adx.html
+ * adx2wav & wav2adx http://www.geocities.co.jp/Playtown/2004/
+ */
+
+#ifndef AVCODEC_ADX_H
+#define AVCODEC_ADX_H
+
+#include <stdint.h>
+
+#include "avcodec.h"
+
+typedef struct ADXChannelState {
+    int s1,s2;
+} ADXChannelState;
+
+typedef struct ADXContext {
+    int channels;
+    ADXChannelState prev[2];
+    int header_parsed;
+    int eof;
+    int cutoff;
+    int coeff[2];
+} ADXContext;
+
+#define COEFF_BITS  12
+
+#define BLOCK_SIZE      18
+#define BLOCK_SAMPLES   32
+
+/**
+ * Calculate LPC coefficients based on cutoff frequency and sample rate.
+ *
+ * @param cutoff       cutoff frequency
+ * @param sample_rate  sample rate
+ * @param bits         number of bits used to quantize coefficients
+ * @param[out] coeff   2 quantized LPC coefficients
+ */
+void ff_adx_calculate_coeffs(int cutoff, int sample_rate, int bits, int *coeff);
+
+/**
+ * Decode ADX stream header.
+ * Sets avctx->channels and avctx->sample_rate.
+ *
+ * @param      avctx        codec context
+ * @param      buf          header data
+ * @param      bufsize      data size, should be at least 24 bytes
+ * @param[out] header_size  size of ADX header
+ * @param[out] coeff        2 LPC coefficients, can be NULL
+ * @return data offset or negative error code if header is invalid
+ */
+int avpriv_adx_decode_header(AVCodecContext *avctx, const uint8_t *buf,
+                             int bufsize, int *header_size, int *coeff);
+
+#endif /* AVCODEC_ADX_H */