92 lines
2.4 KiB
C
92 lines
2.4 KiB
C
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//====== Copyright <20> 1996-2005, Valve Corporation, All rights reserved. =======
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//
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// Purpose:
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//
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//=============================================================================
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#ifndef XWVFILE_H
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#define XWVFILE_H
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#ifdef _WIN32
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#pragma once
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#endif
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#pragma pack(1)
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#define XWV_ID (('X'<<24)|('W'<<16)|('V'<<8)|(' '<<0))
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#define XWV_VERSION 4
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enum xwvSampleRate_t
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{
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XWV_RATE_11025 = 0,
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XWV_RATE_22050 = 1,
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XWV_RATE_44100 = 2,
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};
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enum xwvFormat_t
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{
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XWV_FORMAT_PCM = 0,
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XWV_FORMAT_XMA = 1,
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XWV_FORMAT_ADPCM = 2,
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XWV_FORMAT_MP3 = 3,
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// Used to detect MP3 frame issues.
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XWV_FORMAT_TEMP = 123,
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};
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// 1152 samples for one MP3 frame. 2304 bytes in mono, 4608 in stereo.
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#define NUMBER_OF_SAMPLES_PER_MP3_FRAME 1152
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// generated in big-endian
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struct xwvHeader_t
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{
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unsigned int id;
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unsigned int version;
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unsigned int headerSize; // header only
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unsigned int staticDataSize; // follows header
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unsigned int dataOffset; // start of samples, possibly sector aligned
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unsigned int dataSize; // length of samples in bytes
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unsigned int numDecodedSamples; // for duration calcs
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int loopStart; // -1 = no loop, offset of loop in samples
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unsigned short loopBlock; // the xma block where the loop starts
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unsigned short numLeadingSamples; // number of leading samples in the loop block to discard
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unsigned short numTrailingSamples; // number of trailing samples at the final block to discard
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unsigned short vdatSize; // follows seek table
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byte format;
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byte bitsPerSample;
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byte sampleRate;
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byte channels;
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byte quality;
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byte bHasSeekTable; // indicates presence, follows header
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byte padding[2]; // created as 0
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inline unsigned int GetPreloadSize() { return headerSize + staticDataSize; }
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inline int GetBitsPerSample() const { return bitsPerSample; }
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int GetSampleRate() const
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{
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int rates[] = {11025, 22050, 44100};
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int rate = sampleRate;
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return rates[rate];
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}
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inline int GetChannels() const { return channels; }
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void SetSampleRate( int sampleRateIn )
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{
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byte rate = ( sampleRateIn == 11025 ) ? XWV_RATE_11025 : ( sampleRateIn==22050 )? XWV_RATE_22050 : XWV_RATE_44100;
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sampleRate = rate;
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}
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inline void SetChannels( int channelsIn ) { channels = channelsIn; }
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inline int GetSeekTableSize()
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{
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// seek table is indexed by packets
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return bHasSeekTable ? ( dataSize / 2048 ) * sizeof( int ) : 0;
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}
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};
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#pragma pack()
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#endif // XWVFILE_H
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