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+/* Copyright (C) 2002 Jean-Marc Valin*/
+/**
+  @file speex_callbacks.h
+  @brief Describes callback handling and in-band signalling
+*/
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+   
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+   
+   - Neither the name of the Xiph.org Foundation nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+   
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+#ifndef SPEEX_CALLBACKS_H
+#define SPEEX_CALLBACKS_H
+/** @defgroup SpeexCallbacks Various definitions for Speex callbacks supported by the decoder.
+ *  @{
+ */
+
+#include "speex.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Total number of callbacks */
+#define SPEEX_MAX_CALLBACKS 16
+
+/* Describes all the in-band requests */
+
+/*These are 1-bit requests*/
+/** Request for perceptual enhancement (1 for on, 0 for off) */
+#define SPEEX_INBAND_ENH_REQUEST         0
+/** Reserved */
+#define SPEEX_INBAND_RESERVED1           1
+
+/*These are 4-bit requests*/
+/** Request for a mode change */
+#define SPEEX_INBAND_MODE_REQUEST        2
+/** Request for a low mode change */
+#define SPEEX_INBAND_LOW_MODE_REQUEST    3
+/** Request for a high mode change */
+#define SPEEX_INBAND_HIGH_MODE_REQUEST   4
+/** Request for VBR (1 on, 0 off) */
+#define SPEEX_INBAND_VBR_QUALITY_REQUEST 5
+/** Request to be sent acknowledge */
+#define SPEEX_INBAND_ACKNOWLEDGE_REQUEST 6
+/** Request for VBR (1 for on, 0 for off) */
+#define SPEEX_INBAND_VBR_REQUEST         7
+
+/*These are 8-bit requests*/
+/** Send a character in-band */
+#define SPEEX_INBAND_CHAR                8
+/** Intensity stereo information */
+#define SPEEX_INBAND_STEREO              9
+
+/*These are 16-bit requests*/
+/** Transmit max bit-rate allowed */
+#define SPEEX_INBAND_MAX_BITRATE         10
+
+/*These are 32-bit requests*/
+/** Acknowledge packet reception */
+#define SPEEX_INBAND_ACKNOWLEDGE         12
+
+/** Callback function type */
+typedef int (*speex_callback_func)(SpeexBits *bits, void *state, void *data);
+
+/** Callback information */
+typedef struct SpeexCallback {
+   int callback_id;             /**< ID associated to the callback */
+   speex_callback_func func;    /**< Callback handler function */
+   void *data;                  /**< Data that will be sent to the handler */
+   void *reserved1;             /**< Reserved for future use */
+   int   reserved2;             /**< Reserved for future use */
+} SpeexCallback;
+
+/** Handle in-band request */
+int speex_inband_handler(SpeexBits *bits, SpeexCallback *callback_list, void *state);
+
+/** Standard handler for mode request (change mode, no questions asked) */
+int speex_std_mode_request_handler(SpeexBits *bits, void *state, void *data);
+
+/** Standard handler for high mode request (change high mode, no questions asked) */
+int speex_std_high_mode_request_handler(SpeexBits *bits, void *state, void *data);
+
+/** Standard handler for in-band characters (write to stderr) */
+int speex_std_char_handler(SpeexBits *bits, void *state, void *data);
+
+/** Default handler for user-defined requests: in this case, just ignore */
+int speex_default_user_handler(SpeexBits *bits, void *state, void *data);
+
+
+
+/** Standard handler for low mode request (change low mode, no questions asked) */
+int speex_std_low_mode_request_handler(SpeexBits *bits, void *state, void *data);
+
+/** Standard handler for VBR request (Set VBR, no questions asked) */
+int speex_std_vbr_request_handler(SpeexBits *bits, void *state, void *data);
+
+/** Standard handler for enhancer request (Turn enhancer on/off, no questions asked) */
+int speex_std_enh_request_handler(SpeexBits *bits, void *state, void *data);
+
+/** Standard handler for VBR quality request (Set VBR quality, no questions asked) */
+int speex_std_vbr_quality_request_handler(SpeexBits *bits, void *state, void *data);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+/** @} */
+#endif