speex_header.h

KphoneSI (kpsi) is a SIP (Session Initiation Protocol) user agent for Linux, with which you can in

/* Copyright (C) 2002 Jean-Marc Valin */
/**
   @file speex_header.h
   @brief Describes the Speex header
*/
/*
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   are met:
   
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   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/


#ifndef SPEEX_HEADER_H
#define SPEEX_HEADER_H

#ifdef __cplusplus
extern "C" {
#endif

struct SpeexMode;

/** Maximum number of characters for encoding the Speex version number in the header */
#define SPEEX_HEADER_VERSION_LENGTH 20

/** Speex header info for file-based formats */
typedef struct SpeexHeader {
   char speex_string[8];       /**< Identifies a Speex bit-stream, always set to "Speex   " */
   char speex_version[SPEEX_HEADER_VERSION_LENGTH]; /**< Speex version */
   int speex_version_id;       /**< Version for Speex (for checking compatibility) */
   int header_size;            /**< Total size of the header ( sizeof(SpeexHeader) ) */
   int rate;                   /**< Sampling rate used */
   int mode;                   /**< Mode used (0 for narrowband, 1 for wideband) */
   int mode_bitstream_version; /**< Version ID of the bit-stream */
   int nb_channels;            /**< Number of channels encoded */
   int bitrate;                /**< Bit-rate used */
   int frame_size;             /**< Size of frames */
   int vbr;                    /**< 1 for a VBR encoding, 0 otherwise */
   int frames_per_packet;      /**< Number of frames stored per Ogg packet */
   int extra_headers;          /**< Number of additional headers after the comments */
   int reserved1;              /**< Reserved for future use, must be zero */
   int reserved2;              /**< Reserved for future use, must be zero */
} SpeexHeader;

/** Initializes a SpeexHeader using basic information */
void speex_init_header(SpeexHeader *header, int rate, int nb_channels, struct SpeexMode *m);

/** Creates the header packet from the header itself (mostly involves endianness conversion) */
char *speex_header_to_packet(SpeexHeader *header, int *size);

/** Creates a SpeexHeader from a packet */
SpeexHeader *speex_packet_to_header(char *packet, int size);

#ifdef __cplusplus
}
#endif


#endif