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+/* Copyright (C) 2002-2006 Jean-Marc Valin*/
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+/**
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+ @file speex.h
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+ @brief Describes the different modes of the codec
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+*/
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+/*
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+ Redistribution and use in source and binary forms, with or without
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+ modification, are permitted provided that the following conditions
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+ are met:
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+
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+ - Redistributions of source code must retain the above copyright
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+ notice, this list of conditions and the following disclaimer.
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+
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+ - Redistributions in binary form must reproduce the above copyright
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+ notice, this list of conditions and the following disclaimer in the
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+ documentation and/or other materials provided with the distribution.
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+
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+ - Neither the name of the Xiph.org Foundation nor the names of its
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+ contributors may be used to endorse or promote products derived from
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+ this software without specific prior written permission.
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+
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+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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+ ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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+ LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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+ A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
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+ CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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+ EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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+ PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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+ PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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+ LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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+ NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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+
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+*/
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+
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+#ifndef SPEEX_H
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+#define SPEEX_H
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+/** @defgroup Codec Speex encoder and decoder
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+ * This is the Speex codec itself.
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+ * @{
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+ */
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+
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+#include "speex_bits.h"
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+#include "speex_types.h"
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+
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+#ifdef __cplusplus
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+extern "C" {
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+#endif
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+
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+/* Values allowed for *ctl() requests */
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+
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+/** Set enhancement on/off (decoder only) */
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+#define SPEEX_SET_ENH 0
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+/** Get enhancement state (decoder only) */
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+#define SPEEX_GET_ENH 1
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+
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+/*Would be SPEEX_SET_FRAME_SIZE, but it's (currently) invalid*/
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+/** Obtain frame size used by encoder/decoder */
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+#define SPEEX_GET_FRAME_SIZE 3
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+
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+/** Set quality value */
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+#define SPEEX_SET_QUALITY 4
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+/** Get current quality setting */
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+/* #define SPEEX_GET_QUALITY 5 -- Doesn't make much sense, does it? */
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+
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+/** Set sub-mode to use */
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+#define SPEEX_SET_MODE 6
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+/** Get current sub-mode in use */
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+#define SPEEX_GET_MODE 7
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+
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+/** Set low-band sub-mode to use (wideband only)*/
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+#define SPEEX_SET_LOW_MODE 8
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+/** Get current low-band mode in use (wideband only)*/
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+#define SPEEX_GET_LOW_MODE 9
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+
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+/** Set high-band sub-mode to use (wideband only)*/
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+#define SPEEX_SET_HIGH_MODE 10
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+/** Get current high-band mode in use (wideband only)*/
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+#define SPEEX_GET_HIGH_MODE 11
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+
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+/** Set VBR on (1) or off (0) */
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+#define SPEEX_SET_VBR 12
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+/** Get VBR status (1 for on, 0 for off) */
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+#define SPEEX_GET_VBR 13
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+
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+/** Set quality value for VBR encoding (0-10) */
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+#define SPEEX_SET_VBR_QUALITY 14
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+/** Get current quality value for VBR encoding (0-10) */
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+#define SPEEX_GET_VBR_QUALITY 15
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+
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+/** Set complexity of the encoder (0-10) */
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+#define SPEEX_SET_COMPLEXITY 16
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+/** Get current complexity of the encoder (0-10) */
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+#define SPEEX_GET_COMPLEXITY 17
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+
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+/** Set bit-rate used by the encoder (or lower) */
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+#define SPEEX_SET_BITRATE 18
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+/** Get current bit-rate used by the encoder or decoder */
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+#define SPEEX_GET_BITRATE 19
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+
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+/** Define a handler function for in-band Speex request*/
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+#define SPEEX_SET_HANDLER 20
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+
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+/** Define a handler function for in-band user-defined request*/
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+#define SPEEX_SET_USER_HANDLER 22
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+
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+/** Set sampling rate used in bit-rate computation */
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+#define SPEEX_SET_SAMPLING_RATE 24
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+/** Get sampling rate used in bit-rate computation */
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+#define SPEEX_GET_SAMPLING_RATE 25
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+
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+/** Reset the encoder/decoder memories to zero*/
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+#define SPEEX_RESET_STATE 26
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+
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+/** Get VBR info (mostly used internally) */
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+#define SPEEX_GET_RELATIVE_QUALITY 29
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+
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+/** Set VAD status (1 for on, 0 for off) */
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+#define SPEEX_SET_VAD 30
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+
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+/** Get VAD status (1 for on, 0 for off) */
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+#define SPEEX_GET_VAD 31
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+
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+/** Set Average Bit-Rate (ABR) to n bits per seconds */
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+#define SPEEX_SET_ABR 32
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+/** Get Average Bit-Rate (ABR) setting (in bps) */
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+#define SPEEX_GET_ABR 33
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+
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+/** Set DTX status (1 for on, 0 for off) */
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+#define SPEEX_SET_DTX 34
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+/** Get DTX status (1 for on, 0 for off) */
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+#define SPEEX_GET_DTX 35
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+
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+/** Set submode encoding in each frame (1 for yes, 0 for no, setting to no breaks the standard) */
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+#define SPEEX_SET_SUBMODE_ENCODING 36
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+/** Get submode encoding in each frame */
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+#define SPEEX_GET_SUBMODE_ENCODING 37
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+
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+/*#define SPEEX_SET_LOOKAHEAD 38*/
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+/** Returns the lookahead used by Speex */
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+#define SPEEX_GET_LOOKAHEAD 39
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+
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+/** Sets tuning for packet-loss concealment (expected loss rate) */
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+#define SPEEX_SET_PLC_TUNING 40
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+/** Gets tuning for PLC */
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+#define SPEEX_GET_PLC_TUNING 41
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+
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+/** Sets the max bit-rate allowed in VBR mode */
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+#define SPEEX_SET_VBR_MAX_BITRATE 42
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+/** Gets the max bit-rate allowed in VBR mode */
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+#define SPEEX_GET_VBR_MAX_BITRATE 43
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+
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+/** Turn on/off input/output high-pass filtering */
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+#define SPEEX_SET_HIGHPASS 44
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+/** Get status of input/output high-pass filtering */
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+#define SPEEX_GET_HIGHPASS 45
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+
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+/** Get "activity level" of the last decoded frame, i.e.
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+ how much damage we cause if we remove the frame */
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+#define SPEEX_GET_ACTIVITY 47
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+
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+
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+/* Preserving compatibility:*/
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+/** Equivalent to SPEEX_SET_ENH */
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+#define SPEEX_SET_PF 0
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+/** Equivalent to SPEEX_GET_ENH */
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+#define SPEEX_GET_PF 1
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+
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+
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+
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+
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+/* Values allowed for mode queries */
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+/** Query the frame size of a mode */
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+#define SPEEX_MODE_FRAME_SIZE 0
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+
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+/** Query the size of an encoded frame for a particular sub-mode */
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+#define SPEEX_SUBMODE_BITS_PER_FRAME 1
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+
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+
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+
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+/** Get major Speex version */
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+#define SPEEX_LIB_GET_MAJOR_VERSION 1
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+/** Get minor Speex version */
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+#define SPEEX_LIB_GET_MINOR_VERSION 3
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+/** Get micro Speex version */
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+#define SPEEX_LIB_GET_MICRO_VERSION 5
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+/** Get extra Speex version */
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+#define SPEEX_LIB_GET_EXTRA_VERSION 7
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+/** Get Speex version string */
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+#define SPEEX_LIB_GET_VERSION_STRING 9
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+
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+/*#define SPEEX_LIB_SET_ALLOC_FUNC 10
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+#define SPEEX_LIB_GET_ALLOC_FUNC 11
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+#define SPEEX_LIB_SET_FREE_FUNC 12
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+#define SPEEX_LIB_GET_FREE_FUNC 13
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+
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+#define SPEEX_LIB_SET_WARNING_FUNC 14
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+#define SPEEX_LIB_GET_WARNING_FUNC 15
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+#define SPEEX_LIB_SET_ERROR_FUNC 16
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+#define SPEEX_LIB_GET_ERROR_FUNC 17
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+*/
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+
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+/** Number of defined modes in Speex */
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+#define SPEEX_NB_MODES 3
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+
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+/** modeID for the defined narrowband mode */
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+#define SPEEX_MODEID_NB 0
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+
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+/** modeID for the defined wideband mode */
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+#define SPEEX_MODEID_WB 1
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+
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+/** modeID for the defined ultra-wideband mode */
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+#define SPEEX_MODEID_UWB 2
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+
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+struct SpeexMode;
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+
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+
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+/* Prototypes for mode function pointers */
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+
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+/** Encoder state initialization function */
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+typedef void *(*encoder_init_func)(const struct SpeexMode *mode);
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+
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+/** Encoder state destruction function */
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+typedef void (*encoder_destroy_func)(void *st);
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+
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+/** Main encoding function */
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+typedef int (*encode_func)(void *state, void *in, SpeexBits *bits);
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+
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+/** Function for controlling the encoder options */
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+typedef int (*encoder_ctl_func)(void *state, int request, void *ptr);
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+
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+/** Decoder state initialization function */
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+typedef void *(*decoder_init_func)(const struct SpeexMode *mode);
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+
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+/** Decoder state destruction function */
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+typedef void (*decoder_destroy_func)(void *st);
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+
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+/** Main decoding function */
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+typedef int (*decode_func)(void *state, SpeexBits *bits, void *out);
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+
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+/** Function for controlling the decoder options */
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+typedef int (*decoder_ctl_func)(void *state, int request, void *ptr);
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+
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+
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+/** Query function for a mode */
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+typedef int (*mode_query_func)(const void *mode, int request, void *ptr);
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+
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+/** Struct defining a Speex mode */
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+typedef struct SpeexMode {
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+ /** Pointer to the low-level mode data */
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+ const void *mode;
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+
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+ /** Pointer to the mode query function */
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+ mode_query_func query;
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+
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+ /** The name of the mode (you should not rely on this to identify the mode)*/
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+ const char *modeName;
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+
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+ /**ID of the mode*/
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+ int modeID;
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+
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+ /**Version number of the bitstream (incremented every time we break
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+ bitstream compatibility*/
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+ int bitstream_version;
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+
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+ /** Pointer to encoder initialization function */
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+ encoder_init_func enc_init;
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+
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+ /** Pointer to encoder destruction function */
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+ encoder_destroy_func enc_destroy;
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+
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+ /** Pointer to frame encoding function */
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+ encode_func enc;
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+
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+ /** Pointer to decoder initialization function */
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+ decoder_init_func dec_init;
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+
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+ /** Pointer to decoder destruction function */
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+ decoder_destroy_func dec_destroy;
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+
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+ /** Pointer to frame decoding function */
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+ decode_func dec;
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+
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+ /** ioctl-like requests for encoder */
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+ encoder_ctl_func enc_ctl;
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+
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+ /** ioctl-like requests for decoder */
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+ decoder_ctl_func dec_ctl;
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+
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+} SpeexMode;
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+
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+/**
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+ * Returns a handle to a newly created Speex encoder state structure. For now,
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+ * the "mode" argument can be &nb_mode or &wb_mode . In the future, more modes
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+ * may be added. Note that for now if you have more than one channels to
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+ * encode, you need one state per channel.
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+ *
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+ * @param mode The mode to use (either speex_nb_mode or speex_wb.mode)
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+ * @return A newly created encoder state or NULL if state allocation fails
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+ */
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+void *speex_encoder_init(const SpeexMode *mode);
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+
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+/** Frees all resources associated to an existing Speex encoder state.
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+ * @param state Encoder state to be destroyed */
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+void speex_encoder_destroy(void *state);
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+
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+/** Uses an existing encoder state to encode one frame of speech pointed to by
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+ "in". The encoded bit-stream is saved in "bits".
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+ @param state Encoder state
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+ @param in Frame that will be encoded with a +-2^15 range. This data MAY be
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+ overwritten by the encoder and should be considered uninitialised
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+ after the call.
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+ @param bits Bit-stream where the data will be written
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+ @return 0 if frame needs not be transmitted (DTX only), 1 otherwise
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+ */
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+int speex_encode(void *state, float *in, SpeexBits *bits);
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+
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+/** Uses an existing encoder state to encode one frame of speech pointed to by
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+ "in". The encoded bit-stream is saved in "bits".
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+ @param state Encoder state
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+ @param in Frame that will be encoded with a +-2^15 range
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+ @param bits Bit-stream where the data will be written
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+ @return 0 if frame needs not be transmitted (DTX only), 1 otherwise
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+ */
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+int speex_encode_int(void *state, spx_int16_t *in, SpeexBits *bits);
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+
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+/** Used like the ioctl function to control the encoder parameters
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+ *
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+ * @param state Encoder state
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+ * @param request ioctl-type request (one of the SPEEX_* macros)
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+ * @param ptr Data exchanged to-from function
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+ * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
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+ */
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+int speex_encoder_ctl(void *state, int request, void *ptr);
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+
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+
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+/** Returns a handle to a newly created decoder state structure. For now,
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+ * the mode argument can be &nb_mode or &wb_mode . In the future, more modes
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+ * may be added. Note that for now if you have more than one channels to
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+ * decode, you need one state per channel.
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+ *
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+ * @param mode Speex mode (one of speex_nb_mode or speex_wb_mode)
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+ * @return A newly created decoder state or NULL if state allocation fails
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+ */
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+void *speex_decoder_init(const SpeexMode *mode);
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+
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+/** Frees all resources associated to an existing decoder state.
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+ *
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+ * @param state State to be destroyed
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+ */
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+void speex_decoder_destroy(void *state);
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+
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+/** Uses an existing decoder state to decode one frame of speech from
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+ * bit-stream bits. The output speech is saved written to out.
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+ *
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+ * @param state Decoder state
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+ * @param bits Bit-stream from which to decode the frame (NULL if the packet was lost)
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+ * @param out Where to write the decoded frame
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+ * @return return status (0 for no error, -1 for end of stream, -2 corrupt stream)
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+ */
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+int speex_decode(void *state, SpeexBits *bits, float *out);
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+
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+/** Uses an existing decoder state to decode one frame of speech from
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+ * bit-stream bits. The output speech is saved written to out.
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+ *
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+ * @param state Decoder state
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+ * @param bits Bit-stream from which to decode the frame (NULL if the packet was lost)
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+ * @param out Where to write the decoded frame
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+ * @return return status (0 for no error, -1 for end of stream, -2 corrupt stream)
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+ */
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+int speex_decode_int(void *state, SpeexBits *bits, spx_int16_t *out);
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+
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+/** Used like the ioctl function to control the encoder parameters
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+ *
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+ * @param state Decoder state
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+ * @param request ioctl-type request (one of the SPEEX_* macros)
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+ * @param ptr Data exchanged to-from function
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+ * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
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+ */
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+int speex_decoder_ctl(void *state, int request, void *ptr);
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+
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+
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+/** Query function for mode information
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+ *
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+ * @param mode Speex mode
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+ * @param request ioctl-type request (one of the SPEEX_* macros)
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+ * @param ptr Data exchanged to-from function
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+ * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
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+ */
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+int speex_mode_query(const SpeexMode *mode, int request, void *ptr);
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+
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+/** Functions for controlling the behavior of libspeex
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+ * @param request ioctl-type request (one of the SPEEX_LIB_* macros)
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+ * @param ptr Data exchanged to-from function
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+ * @return 0 if no error, -1 if request in unknown, -2 for invalid parameter
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+ */
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+int speex_lib_ctl(int request, void *ptr);
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+
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+/** Default narrowband mode */
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+extern const SpeexMode speex_nb_mode;
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+
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+/** Default wideband mode */
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+extern const SpeexMode speex_wb_mode;
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+
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+/** Default "ultra-wideband" mode */
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+extern const SpeexMode speex_uwb_mode;
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+
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+/** List of all modes available */
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+extern const SpeexMode * const speex_mode_list[SPEEX_NB_MODES];
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+
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+/** Obtain one of the modes available */
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+const SpeexMode * speex_lib_get_mode (int mode);
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+
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+#ifndef WIN32
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+/* We actually override the function in the narrowband case so that we can avoid linking in the wideband stuff */
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+#define speex_lib_get_mode(mode) ((mode)==SPEEX_MODEID_NB ? &speex_nb_mode : speex_lib_get_mode (mode))
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+#endif
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+
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+#ifdef __cplusplus
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+}
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+#endif
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+
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+/** @}*/
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+#endif
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