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69 lines
1.9 KiB
C++
69 lines
1.9 KiB
C++
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#define INITGUID
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#include <mmdeviceapi.h>
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#undef INITGUID
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#include <mmreg.h>
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static WAVEFORMATEXTENSIBLE format_24_stereo =
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{
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{
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WAVE_FORMAT_EXTENSIBLE,
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2,
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88200,
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705600,
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8,
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32,
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22,
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},
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24,
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SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT,
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KSDATAFORMAT_SUBTYPE_PCM
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};
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static WORD BitsPerSampleContainer(int bitspersamp)
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{
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if (bitspersamp <= 8) {
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return 8;
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} else if (bitspersamp <= 16) {
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return 16;
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} else if (bitspersamp <= 24) {
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return 24;
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} else {
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return 32;
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}
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}
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static WORD ChannelMask(int numchannels)
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{
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switch(numchannels) {
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case 1:
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return SPEAKER_FRONT_CENTER;
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case 2:
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return SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT;
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case 4: // quadraphonic
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return SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT;
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case 6: // 5.1
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return SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY;
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default:
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return 0;
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}
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}
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WAVEFORMATEXTENSIBLE WaveFormatForParameters(int samplerate, int numchannels, int bitspersamp)
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{
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WAVEFORMATEXTENSIBLE wave_format;
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wave_format.Format.wFormatTag = WAVE_FORMAT_EXTENSIBLE; /* format type */
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wave_format.Format.nChannels = numchannels; /* number of channels (i.e. mono, stereo...) */
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wave_format.Format.nSamplesPerSec = samplerate; /* sample rate */
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wave_format.Format.nAvgBytesPerSec = BitsPerSampleContainer(bitspersamp) * numchannels * samplerate / 8; /* for buffer estimation */
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wave_format.Format.nBlockAlign = BitsPerSampleContainer(bitspersamp) * numchannels / 8; /* block size of data */
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wave_format.Format.wBitsPerSample = BitsPerSampleContainer(bitspersamp);
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wave_format.Format.cbSize = 22; /* the count in bytes of the size of */
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/* extra information (after cbSize) */
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wave_format.Samples.wValidBitsPerSample = bitspersamp;
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wave_format.dwChannelMask = ChannelMask(numchannels);
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wave_format.SubFormat=KSDATAFORMAT_SUBTYPE_PCM;
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return wave_format;
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}
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