72 lines
1.9 KiB
C++
72 lines
1.9 KiB
C++
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#include "WAVEncoder.h"
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#define rev32(X) ((((DWORD)(X)&0xFF)<<24)|(((DWORD)(X)&0xFF00)<<8)|(((DWORD)(X)&0xFF0000)>>8)|(((DWORD)(X)&0xFF000000)>>24))
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WAVEncoder::WAVEncoder(int nch, int srate, int bps, ACMConfig *config)
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{
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numBytes = 0;
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inputFormat.wFormatTag = WAVE_FORMAT_PCM;
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inputFormat.nChannels = nch;
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inputFormat.nSamplesPerSec = srate;
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inputFormat.nAvgBytesPerSec = srate * nch * (bps >> 3);
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inputFormat.nBlockAlign = nch * (bps >> 3);
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inputFormat.wBitsPerSample = bps;
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inputFormat.cbSize = 0;
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do_header = config->header;
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if (do_header)
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first = 44;
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}
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int WAVEncoder::Encode(int framepos, void *in, int in_avail, int *in_used, void *out, int out_avail)
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{
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if (first)
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{
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int valid = min(first, out_avail);
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first -= valid;
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*in_used = 0;
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return valid;
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}
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int valid = min(in_avail, out_avail);
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memcpy(out, in, valid);
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*in_used = valid;
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numBytes += valid;
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return valid;
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}
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void WAVEncoder::PrepareToFinish()
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{}
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void WAVEncoder::FinishAudio(const wchar_t *filename)
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{
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if (!do_header) return;
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// open old file
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HANDLE tempfile = CreateFileW(filename, GENERIC_READ | GENERIC_WRITE, 0, 0, OPEN_EXISTING, 0, 0);
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if (tempfile)
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{
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// rewrite initial 44 bytes
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DWORD bw = 0;
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unsigned __int32 t;
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t = rev32('RIFF');
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WriteFile(tempfile, &t, 4, &bw, 0); // RIFF (4 bytes)
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t = (unsigned __int32)numBytes + 36;
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bw = 0;WriteFile(tempfile, &t, 4, &bw, 0); // size of chunk (4 bytes)
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t = rev32('WAVE');
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bw = 0;WriteFile(tempfile, &t, 4, &bw, 0); // WAVE (4 bytes)
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t = rev32('fmt ');
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bw = 0;WriteFile(tempfile, &t, 4, &bw, 0);// fmt (4 bytes)
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t = 16;
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bw = 0;WriteFile(tempfile, &t, 4, &bw, 0);// size of chunk (4 bytes)
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bw = 0;WriteFile(tempfile, &inputFormat, 16, &bw, 0); // write WAVEFORMAT out (16 bytes)
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t = rev32('data');
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bw = 0;WriteFile(tempfile, &t, 4, &bw, 0);// data (4 bytes)
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bw = 0;WriteFile(tempfile, &numBytes, 4, &bw, 0);// size of chunk (4 bytes)
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CloseHandle(tempfile);
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}
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}
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