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/*
* Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef MODULES_AUDIO_CODING_CODECS_G711_MAIN_INTERFACE_G711_INTERFACE_H_
#define MODULES_AUDIO_CODING_CODECS_G711_MAIN_INTERFACE_G711_INTERFACE_H_
#include "webrtc/typedefs.h"
// Comfort noise constants
#define G711_WEBRTC_SPEECH 1
#define G711_WEBRTC_CNG 2
#ifdef __cplusplus
extern "C" {
#endif
/****************************************************************************
* WebRtcG711_EncodeA(...)
*
* This function encodes a G711 A-law frame and inserts it into a packet.
* Input speech length has be of any length.
*
* Input:
* - speechIn : Input speech vector
* - len : Samples in speechIn
*
* Output:
* - encoded : The encoded data vector
*
* Return value : >0 - Length (in bytes) of coded data
* -1 - Error
*/
int16_t WebRtcG711_EncodeA(int16_t* speechIn,
int16_t len,
int16_t* encoded);
/****************************************************************************
* WebRtcG711_EncodeU(...)
*
* This function encodes a G711 U-law frame and inserts it into a packet.
* Input speech length has be of any length.
*
* Input:
* - speechIn : Input speech vector
* - len : Samples in speechIn
*
* Output:
* - encoded : The encoded data vector
*
* Return value : >0 - Length (in bytes) of coded data
* -1 - Error
*/
int16_t WebRtcG711_EncodeU(int16_t* speechIn,
int16_t len,
int16_t* encoded);
/****************************************************************************
* WebRtcG711_DecodeA(...)
*
* This function decodes a packet G711 A-law frame.
*
* Input:
* - encoded : Encoded data
* - len : Bytes in encoded vector
*
* Output:
* - decoded : The decoded vector
* - speechType : 1 normal, 2 CNG (for G711 it should
* always return 1 since G711 does not have a
* built-in DTX/CNG scheme)
*
* Return value : >0 - Samples in decoded vector
* -1 - Error
*/
int16_t WebRtcG711_DecodeA(int16_t* encoded,
int16_t len,
int16_t* decoded,
int16_t* speechType);
/****************************************************************************
* WebRtcG711_DecodeU(...)
*
* This function decodes a packet G711 U-law frame.
*
* Input:
* - encoded : Encoded data
* - len : Bytes in encoded vector
*
* Output:
* - decoded : The decoded vector
* - speechType : 1 normal, 2 CNG (for G711 it should
* always return 1 since G711 does not have a
* built-in DTX/CNG scheme)
*
* Return value : >0 - Samples in decoded vector
* -1 - Error
*/
int16_t WebRtcG711_DecodeU(int16_t* encoded,
int16_t len,
int16_t* decoded,
int16_t* speechType);
/****************************************************************************
* WebRtcG711_DurationEst(...)
*
* This function estimates the duration of a G711 packet in samples.
*
* Input:
* - payload : Encoded data
* - payloadLengthBytes : Bytes in encoded vector
*
* Return value : The duration of the packet in samples, which is
* just payload_length_bytes, since G.711 uses one
* byte per sample.
*/
int WebRtcG711_DurationEst(const uint8_t* payload,
int payload_length_bytes);
/**********************************************************************
* WebRtcG711_Version(...)
*
* This function gives the version string of the G.711 codec.
*
* Input:
* - lenBytes: the size of Allocated space (in Bytes) where
* the version number is written to (in string format).
*
* Output:
* - version: Pointer to a buffer where the version number is
* written to.
*
*/
int16_t WebRtcG711_Version(char* version, int16_t lenBytes);
#ifdef __cplusplus
}
#endif
#endif /* MODULES_AUDIO_CODING_CODECS_G711_MAIN_INTERFACE_G711_INTERFACE_H_ */
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