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Document MakePixToneObject a bit more

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Clownacy 2020-09-22 01:43:09 +01:00
parent 049b5e373a
commit ab217f7f6f
1 changed files with 26 additions and 29 deletions
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53
src/Sound.cpp
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@ -297,22 +297,19 @@ void ChangeSoundPan(int no, long pan) // 512がMAXで256がﾉｰﾏﾙ (512 is
int MakePixToneObject(const PIXTONEPARAMETER *ptp, int ptp_num, int no)
{
// For some reason, this function creates an entire WAV file header,
// when it only needs a WAVEFORMATEX
// when it only needs a WAVEFORMATEX.
// From what I can tell, there's no struct like this in the Windows
// headers, so Pixel must have defined it manually, just like this:
typedef struct WavHeader
{
CHAR riff[4];
DWORD wav_size;
CHAR wave[4];
CHAR fmt[4];
DWORD fmt_chunk_size;
WORD audio_format;
WORD num_channels;
DWORD sample_rate;
DWORD byte_rate;
WORD sample_alignment;
WORD bit_depth;
CHAR data[4];
DWORD data_bytes;
FOURCC riff_id;
DWORD riff_size;
FOURCC wave_id;
FOURCC fmt_id;
DWORD fmt_size;
PCMWAVEFORMAT format;
FOURCC data_id;
DWORD data_size;
} WavHeader;
int sample_count;
@ -331,19 +328,19 @@ int MakePixToneObject(const PIXTONEPARAMETER *ptp, int ptp_num, int no)
const char *wave = "WAVE";
const char *data = "data";
wav_header.bit_depth = 8;
wav_header.sample_rate = 22050;
wav_header.num_channels = 1;
wav_header.audio_format = WAVE_FORMAT_PCM;
wav_header.fmt_chunk_size = 16;
memcpy(wav_header.riff, riff, 4);
memcpy(wav_header.fmt, fmt, 4);
memcpy(wav_header.wave, wave, 4);
memcpy(wav_header.data, data, 4);
wav_header.sample_alignment = (wav_header.bit_depth / 8) * wav_header.num_channels;
wav_header.byte_rate = (wav_header.bit_depth / 8) * wav_header.num_channels * wav_header.sample_rate;
wav_header.data_bytes = wav_header.sample_alignment * ptp->size; // Note that this uses ptp->size, not sample_count. If this header were ever used, it would be incorrect.
wav_header.wav_size = wav_header.data_bytes + 36;
wav_header.format.wBitsPerSample = 8;
wav_header.format.wf.nSamplesPerSec = 22050;
wav_header.format.wf.nChannels = 1;
wav_header.format.wf.wFormatTag = WAVE_FORMAT_PCM;
wav_header.fmt_size = sizeof(wav_header.format);
memcpy(&wav_header.riff_id, riff, sizeof(FOURCC));
memcpy(&wav_header.fmt_id, fmt, sizeof(FOURCC));
memcpy(&wav_header.wave_id, wave, sizeof(FOURCC));
memcpy(&wav_header.data_id, data, sizeof(FOURCC));
wav_header.format.wf.nBlockAlign = (wav_header.format.wBitsPerSample / 8) * wav_header.format.wf.nChannels;
wav_header.format.wf.nAvgBytesPerSec = (wav_header.format.wBitsPerSample / 8) * wav_header.format.wf.nChannels * wav_header.format.wf.nSamplesPerSec;
wav_header.data_size = wav_header.format.wf.nBlockAlign * ptp->size; // Note that this uses ptp->size, not sample_count. If this header were ever used, it would be incorrect.
wav_header.riff_size = sizeof(wav_header) - 8 + wav_header.data_size;
ptp_pointer = ptp;
sample_count = 0;
@ -360,7 +357,7 @@ int MakePixToneObject(const PIXTONEPARAMETER *ptp, int ptp_num, int no)
dsbd.dwSize = sizeof(dsbd);
dsbd.dwFlags = DSBCAPS_STATIC | DSBCAPS_GLOBALFOCUS | DSBCAPS_CTRLPAN | DSBCAPS_CTRLVOLUME | DSBCAPS_CTRLFREQUENCY;
dsbd.dwBufferBytes = sample_count;
dsbd.lpwfxFormat = (WAVEFORMATEX*)&wav_header.audio_format;
dsbd.lpwfxFormat = (LPWAVEFORMATEX)&wav_header.format;
if (lpDS->CreateSoundBuffer(&dsbd, &lpSECONDARYBUFFER[no], 0) != DS_OK)
return -1;