//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
//=============================================================================

#ifndef XWVFILE_H
#define XWVFILE_H
#ifdef _WIN32
#pragma once
#endif

#pragma pack(1)

#define XWV_ID (('X' << 24) | ('W' << 16) | ('V' << 8) | (' ' << 0))
#define XWV_VERSION 4

enum xwvSampleRate_t {
    XWV_RATE_11025 = 0,
    XWV_RATE_22050 = 1,
    XWV_RATE_44100 = 2,
};

enum xwvFormat_t {
    XWV_FORMAT_PCM = 0,
    XWV_FORMAT_XMA = 1,
    XWV_FORMAT_ADPCM = 2,
};

// generated in big-endian
struct xwvHeader_t {
    unsigned int id;
    unsigned int version;
    unsigned int headerSize;      // header only
    unsigned int staticDataSize;  // follows header
    unsigned int dataOffset;      // start of samples, possibly sector aligned
    unsigned int dataSize;        // length of samples in bytes
    unsigned int numDecodedSamples;  // for duration calcs
    int loopStart;                   // -1 = no loop, offset of loop in samples
    unsigned short loopBlock;        // the xma block where the loop starts
    unsigned short numLeadingSamples;   // number of leading samples in the loop
                                        // block to discard
    unsigned short numTrailingSamples;  // number of trailing samples at the
                                        // final block to discard
    unsigned short vdatSize;            // follows seek table
    byte format;
    byte bitsPerSample;
    byte sampleRate;
    byte channels;
    byte quality;
    byte bHasSeekTable;  // indicates presence, follows header
    byte padding[2];     // created as 0

    inline unsigned int GetPreloadSize() { return headerSize + staticDataSize; }

    inline int GetBitsPerSample() const { return bitsPerSample; }

    int GetSampleRate() const {
        int rates[] = {11025, 22050, 44100};
        int rate = sampleRate;
        return rates[rate];
    }

    inline int GetChannels() const { return channels; }

    void SetSampleRate(int sampleRateIn) {
        byte rate =
            (sampleRateIn == 11025)
                ? XWV_RATE_11025
                : (sampleRateIn == 22050) ? XWV_RATE_22050 : XWV_RATE_44100;
        sampleRate = rate;
    }

    inline void SetChannels(int channelsIn) { channels = channelsIn; }

    inline int GetSeekTableSize() {
        // seek table is indexed by packets
        return bHasSeekTable ? (dataSize / 2048) * sizeof(int) : 0;
    }
};

#pragma pack()

#endif  // XWVFILE_H