87 lines
3.6 KiB
C
87 lines
3.6 KiB
C
|
/* Copyright (C) 2002 Jean-Marc Valin */
|
||
|
|
/**
|
||
|
|
@file speex_header.h
|
||
|
|
@brief Describes the Speex header
|
||
|
|
*/
|
||
|
|
/*
|
||
|
|
Redistribution and use in source and binary forms, with or without
|
||
|
|
modification, are permitted provided that the following conditions
|
||
|
|
are met:
|
||
|
|
|
||
|
|
- Redistributions of source code must retain the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer.
|
||
|
|
|
||
|
|
- Redistributions in binary form must reproduce the above copyright
|
||
|
|
notice, this list of conditions and the following disclaimer in the
|
||
|
|
documentation and/or other materials provided with the distribution.
|
||
|
|
|
||
|
|
- Neither the name of the Xiph.org Foundation nor the names of its
|
||
|
|
contributors may be used to endorse or promote products derived from
|
||
|
|
this software without specific prior written permission.
|
||
|
|
|
||
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
||
|
|
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
||
|
|
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
||
|
|
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
|
||
|
|
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
|
||
|
|
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||
|
|
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
|
||
|
|
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
|
||
|
|
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
|
||
|
|
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
|
||
|
|
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
|
||
|
|
*/
|
||
|
|
|
||
|
|
|
||
|
|
#ifndef SPEEX_HEADER_H
|
||
|
|
#define SPEEX_HEADER_H
|
||
|
|
|
||
|
|
#include "speex/speex_types.h"
|
||
|
|
|
||
|
|
#ifdef __cplusplus
|
||
|
|
extern "C" {
|
||
|
|
#endif
|
||
|
|
|
||
|
|
struct SpeexMode;
|
||
|
|
|
||
|
|
#define SPEEX_HEADER_STRING_LENGTH 8
|
||
|
|
|
||
|
|
/** 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[SPEEX_HEADER_STRING_LENGTH]; /**< Identifies a Speex bit-stream, always set to "Speex " */
|
||
|
|
char speex_version[SPEEX_HEADER_VERSION_LENGTH]; /**< Speex version */
|
||
|
|
spx_int32_t speex_version_id; /**< Version for Speex (for checking compatibility) */
|
||
|
|
spx_int32_t header_size; /**< Total size of the header ( sizeof(SpeexHeader) ) */
|
||
|
|
spx_int32_t rate; /**< Sampling rate used */
|
||
|
|
spx_int32_t mode; /**< Mode used (0 for narrowband, 1 for wideband) */
|
||
|
|
spx_int32_t mode_bitstream_version; /**< Version ID of the bit-stream */
|
||
|
|
spx_int32_t nb_channels; /**< Number of channels encoded */
|
||
|
|
spx_int32_t bitrate; /**< Bit-rate used */
|
||
|
|
spx_int32_t frame_size; /**< Size of frames */
|
||
|
|
spx_int32_t vbr; /**< 1 for a VBR encoding, 0 otherwise */
|
||
|
|
spx_int32_t frames_per_packet; /**< Number of frames stored per Ogg packet */
|
||
|
|
spx_int32_t extra_headers; /**< Number of additional headers after the comments */
|
||
|
|
spx_int32_t reserved1; /**< Reserved for future use, must be zero */
|
||
|
|
spx_int32_t 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, const 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
|