56db559754
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@15209 a1c6a512-1295-4272-9138-f99709370657
429 lines
14 KiB
C
429 lines
14 KiB
C
/* 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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- 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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- 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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- 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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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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#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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#include "speex_bits.h"
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#include "speex_types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Values allowed for *ctl() requests */
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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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/*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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** Define a handler function for in-band Speex request*/
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#define SPEEX_SET_HANDLER 20
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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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/** 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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/** Reset the encoder/decoder memories to zero*/
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#define SPEEX_RESET_STATE 26
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/** Get VBR info (mostly used internally) */
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#define SPEEX_GET_RELATIVE_QUALITY 29
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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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/** Get VAD status (1 for on, 0 for off) */
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#define SPEEX_GET_VAD 31
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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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/** 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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/** 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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/*#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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/** 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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/** 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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/** 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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/** 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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/* 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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/* 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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/** 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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/** 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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/*#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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#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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/** Number of defined modes in Speex */
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#define SPEEX_NB_MODES 3
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/** modeID for the defined narrowband mode */
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#define SPEEX_MODEID_NB 0
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/** modeID for the defined wideband mode */
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#define SPEEX_MODEID_WB 1
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/** modeID for the defined ultra-wideband mode */
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#define SPEEX_MODEID_UWB 2
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#ifdef EPIC_48K
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/** modeID for the Epic 48K mode */
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#define SPEEX_MODEID_NB_48K 1000
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#endif
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struct SpeexMode;
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/* Prototypes for mode function pointers */
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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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/** Encoder state destruction function */
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typedef void (*encoder_destroy_func)(void *st);
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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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/** 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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/** Decoder state initialization function */
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typedef void *(*decoder_init_func)(const struct SpeexMode *mode);
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/** Decoder state destruction function */
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typedef void (*decoder_destroy_func)(void *st);
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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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/** 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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/** 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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/** 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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/** Pointer to the mode query function */
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mode_query_func query;
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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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/**ID of the mode*/
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int modeID;
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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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/** Pointer to encoder initialization function */
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encoder_init_func enc_init;
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/** Pointer to encoder destruction function */
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encoder_destroy_func enc_destroy;
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/** Pointer to frame encoding function */
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encode_func enc;
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/** Pointer to decoder initialization function */
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decoder_init_func dec_init;
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/** Pointer to decoder destruction function */
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decoder_destroy_func dec_destroy;
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/** Pointer to frame decoding function */
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decode_func dec;
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/** ioctl-like requests for encoder */
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encoder_ctl_func enc_ctl;
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/** ioctl-like requests for decoder */
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decoder_ctl_func dec_ctl;
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} SpeexMode;
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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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** 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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/** Default narrowband mode */
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extern const SpeexMode speex_nb_mode;
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/** Default wideband mode */
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extern const SpeexMode speex_wb_mode;
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/** Default "ultra-wideband" mode */
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extern const SpeexMode speex_uwb_mode;
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#ifdef EPIC_48K
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/** 4.8 kbps narrowband mode */
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extern const SpeexMode speex_nb_48k_mode;
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#endif
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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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/** Obtain one of the modes available */
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const SpeexMode * speex_lib_get_mode (int mode);
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#ifdef __cplusplus
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}
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#endif
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/** @}*/
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#endif
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