1 /* Copyright (C) 2002 Jean-Marc Valin */
4 @brief Describes the Speex header
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions
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14 - Redistributions in binary form must reproduce the above copyright
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22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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37 #ifndef SPEEX_HEADER_H
38 #define SPEEX_HEADER_H
46 /** Maximum number of characters for encoding the Speex version number in the header */
47 #define SPEEX_HEADER_VERSION_LENGTH 20
49 /** Speex header info for file-based formats */
50 typedef struct SpeexHeader
{
51 char speex_string
[8]; /**< Identifies a Speex bit-stream, always set to "Speex " */
52 char speex_version
[SPEEX_HEADER_VERSION_LENGTH
]; /**< Speex version */
53 int speex_version_id
; /**< Version for Speex (for checking compatibility) */
54 int header_size
; /**< Total size of the header ( sizeof(SpeexHeader) ) */
55 int rate
; /**< Sampling rate used */
56 int mode
; /**< Mode used (0 for narrowband, 1 for wideband) */
57 int mode_bitstream_version
; /**< Version ID of the bit-stream */
58 int nb_channels
; /**< Number of channels encoded */
59 int bitrate
; /**< Bit-rate used */
60 int frame_size
; /**< Size of frames */
61 int vbr
; /**< 1 for a VBR encoding, 0 otherwise */
62 int frames_per_packet
; /**< Number of frames stored per Ogg packet */
63 int extra_headers
; /**< Number of additional headers after the comments */
64 int reserved1
; /**< Reserved for future use, must be zero */
65 int reserved2
; /**< Reserved for future use, must be zero */
68 /** Initializes a SpeexHeader using basic information */
69 void speex_init_header(SpeexHeader
*header
, int rate
, int nb_channels
, struct SpeexMode
*m
);
71 /** Creates the header packet from the header itself (mostly involves endianness conversion) */
72 char *speex_header_to_packet(SpeexHeader
*header
, int *size
);
74 /** Creates a SpeexHeader from a packet */
75 SpeexHeader
*speex_packet_to_header(char *packet
, int size
);