speex_header.h

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00001 /* Copyright (C) 2002 Jean-Marc Valin */
00006 /*
00007    Redistribution and use in source and binary forms, with or without
00008    modification, are permitted provided that the following conditions
00009    are met:
00010    
00011    - Redistributions of source code must retain the above copyright
00012    notice, this list of conditions and the following disclaimer.
00013    
00014    - Redistributions in binary form must reproduce the above copyright
00015    notice, this list of conditions and the following disclaimer in the
00016    documentation and/or other materials provided with the distribution.
00017    
00018    - Neither the name of the Xiph.org Foundation nor the names of its
00019    contributors may be used to endorse or promote products derived from
00020    this software without specific prior written permission.
00021    
00022    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
00023    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00024    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
00025    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
00026    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
00027    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
00028    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
00029    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
00030    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
00031    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
00032    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00033 
00034 */
00035 
00036 
00037 #ifndef SPEEX_HEADER_H
00038 #define SPEEX_HEADER_H
00039 
00044 #include "speex/speex_types.h"
00045 
00046 #ifdef __cplusplus
00047 extern "C" {
00048 #endif
00049 
00050 struct SpeexMode;
00051 
00053 #define SPEEX_HEADER_STRING_LENGTH 8
00054 
00056 #define SPEEX_HEADER_VERSION_LENGTH 20
00057 
00059 typedef struct SpeexHeader {
00060    char speex_string[SPEEX_HEADER_STRING_LENGTH];   
00061    char speex_version[SPEEX_HEADER_VERSION_LENGTH]; 
00062    spx_int32_t speex_version_id;       
00063    spx_int32_t header_size;            
00064    spx_int32_t rate;                   
00065    spx_int32_t mode;                   
00066    spx_int32_t mode_bitstream_version; 
00067    spx_int32_t nb_channels;            
00068    spx_int32_t bitrate;                
00069    spx_int32_t frame_size;             
00070    spx_int32_t vbr;                    
00071    spx_int32_t frames_per_packet;      
00072    spx_int32_t extra_headers;          
00073    spx_int32_t reserved1;              
00074    spx_int32_t reserved2;              
00075 } SpeexHeader;
00076 
00078 void speex_init_header(SpeexHeader *header, int rate, int nb_channels, const struct SpeexMode *m);
00079 
00081 char *speex_header_to_packet(SpeexHeader *header, int *size);
00082 
00084 SpeexHeader *speex_packet_to_header(char *packet, int size);
00085 
00087 void speex_header_free(void *ptr);
00088 
00089 #ifdef __cplusplus
00090 }
00091 #endif
00092 
00094 #endif

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