austream.h
资源名称:NETVIDEO.rar [点击查看]
上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:4k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /**********************************************************************
- MPEG-4 Audio VM
- audio i/o streams (.au format)
- This software module was originally developed by
- Heiko Purnhagen (University of Hannover)
- and edited by
- in the course of development of the MPEG-2 NBC/MPEG-4 Audio standard
- ISO/IEC 13818-7, 14496-1,2 and 3. This software module is an
- implementation of a part of one or more MPEG-2 NBC/MPEG-4 Audio tools
- as specified by the MPEG-2 NBC/MPEG-4 Audio standard. ISO/IEC gives
- users of the MPEG-2 NBC/MPEG-4 Audio standards free license to this
- software module or modifications thereof for use in hardware or
- software products claiming conformance to the MPEG-2 NBC/ MPEG-4 Audio
- standards. Those intending to use this software module in hardware or
- software products are advised that this use may infringe existing
- patents. The original developer of this software module and his/her
- company, the subsequent editors and their companies, and ISO/IEC have
- no liability for use of this software module or modifications thereof
- in an implementation. Copyright is not released for non MPEG-2
- NBC/MPEG-4 Audio conforming products. The original developer retains
- full right to use the code for his/her own purpose, assign or donate
- the code to a third party and to inhibit third party from using the
- code for non MPEG-2 NBC/MPEG-4 Audio conforming products. This
- copyright notice must be included in all copies or derivative works.
- Copyright (c) 1999.
- Header file: austream.h
- $Id: austream.h,v 1.2 2002/05/13 15:48:18 mvillari Exp $
- Authors:
- HP Heiko Purnhagen, Uni Hannover <purnhage@tnt.uni-hannover.de>
- NM Nikolaus Meine, Uni Hannover <meine@tnt.uni-hannover.de>
- Changes:
- 16-sep-98 HP/NM born, based on au_io.c
- **********************************************************************/
- /* Audio i/o streaming with stdin/stdout support. */
- /* Header format: .au (Sun audio file format, aka SND or AFsp) */
- /* Sample format: 16 bit twos complement, uniform quantisation */
- /* Data size set to -1 (=unknown) */
- /* Multi channel data is interleaved: l0 r0 l1 r1 ... */
- /* Total number of samples (over all channels) is used. */
- #ifndef _austream_h_
- #define _austream_h_
- /* ---------- declarations ---------- */
- typedef struct AuStreamStruct AuStream; /* audio stream handle */
- /* ---------- functions ---------- */
- #ifdef __cplusplus
- extern "C" {
- #endif
- /* AuInit() */
- /* Init audio i/o streams. */
- void AuInit (
- int debugLevel); /* in: debug level */
- /* 0=off 1=basic 2=full */
- /* AuOpenRead() */
- /* Open audio stream for reading. */
- AuStream *AuOpenRead (
- char *streamName, /* in: stream name, "-" for stdin */
- int *numChannel, /* out: number of channels */
- float *fSample, /* out: sampling frequency [Hz] */
- long *numSample); /* out: number of samples in stream */
- /* or -1 if not available */
- /* returns: */
- /* audio stream (handle) */
- /* or NULL if error */
- /* AuOpenWrite() */
- /* Open audio stream for writing. */
- AuStream *AuOpenWrite (
- char *streamName, /* in: stream name, "-" for stdout */
- int numChannel, /* in: number of channels */
- float fSample); /* in: sampling frequency [Hz] */
- /* returns: */
- /* audio stream (handle) */
- /* or NULL if error */
- /* AuReadData() */
- /* Read data from audio stream. */
- long AuReadData (
- AuStream *stream, /* in: audio stream (handle) */
- short *data, /* out: data[] */
- long numSample); /* in: number of samples to be read */
- /* returns: */
- /* number of samples read */
- /* AuWriteData() */
- /* Write data to audio stream. */
- void AuWriteData (
- AuStream *stream, /* in: audio stream (handle) */
- short *data, /* in: data[] */
- long numSample); /* in: number of samples to be written */
- /* AuClose() */
- /* Close audio stream.*/
- void AuClose (
- AuStream *stream); /* in: audio stream (handle) */
- #ifdef __cplusplus
- }
- #endif
- #endif /* #ifndef _austream_h_ */
- /* end of austream.h */