| public FindChunk ( string name, int startFromChunk ) : int | ||
| name | string | |
| startFromChunk | int | |
| return | int | |
// GetWavinfo
private static wavinfo_t GetWavInfo(string name, byte[] wav)
{
wavinfo_t info = new wavinfo_t();
if (wav == null)
{
return(info);
}
// debug
//using (FileStream fs = new FileStream(Path.GetFileName(name), FileMode.Create, FileAccess.Write, FileShare.Read))
//{
// fs.Write(wav, 0, wav.Length);
//}
WavHelper helper = new WavHelper(wav);
int offset = 0;
// find "RIFF" chunk
int riff = helper.FindChunk("RIFF", offset);
if (riff == -1)
{
Con.Print("Missing RIFF chunk\n");
return(info);
}
string wave = Encoding.ASCII.GetString(wav, offset + 8, 4);
if (wave != "WAVE")
{
Con.Print("RIFF chunk is not WAVE\n");
return(info);
}
// get "fmt " chunk
offset += 12; //iff_data = data_p + 12;
int fmt = helper.FindChunk("fmt ", offset);
if (fmt == -1)
{
Con.Print("Missing fmt chunk\n");
return(info);
}
int format = helper.GetLittleShort(fmt + 8);
if (format != 1)
{
Con.Print("Microsoft PCM format only\n");
return(info);
}
info.channels = helper.GetLittleShort(fmt + 10);
info.rate = helper.GetLittleLong(fmt + 12);
info.width = helper.GetLittleShort(fmt + 16 + 4 + 2) / 8;
// get cue chunk
int cue = helper.FindChunk("cue ", offset);
if (cue != -1)
{
info.loopstart = helper.GetLittleLong(cue + 32);
// if the next chunk is a LIST chunk, look for a cue length marker
int list = helper.FindChunk("LIST", cue);
if (list != -1)
{
string mark = Encoding.ASCII.GetString(wav, list + 28, 4);
if (mark == "mark")
{
// this is not a proper parse, but it works with cooledit...
int i = helper.GetLittleLong(list + 24); // samples in loop
info.samples = info.loopstart + i;
}
}
}
else
{
info.loopstart = -1;
}
// find data chunk
int data = helper.FindChunk("data", offset);
if (data == -1)
{
Con.Print("Missing data chunk\n");
return(info);
}
int samples = helper.GetLittleLong(data + 4) / info.width;
if (info.samples > 0)
{
if (samples < info.samples)
{
Sys.Error("Sound {0} has a bad loop length", name);
}
}
else
{
info.samples = samples;
}
info.dataofs = data + 8;
return(info);
}
// GetWavinfo
static wavinfo_t GetWavInfo(string name, byte[] wav)
{
wavinfo_t info = new wavinfo_t();
if (wav == null)
return info;
// debug
//using (FileStream fs = new FileStream(Path.GetFileName(name), FileMode.Create, FileAccess.Write, FileShare.Read))
//{
// fs.Write(wav, 0, wav.Length);
//}
WavHelper helper = new WavHelper(wav);
int offset = 0;
// find "RIFF" chunk
int riff = helper.FindChunk("RIFF", offset);
if (riff == -1)
{
Con.Print("Missing RIFF chunk\n");
return info;
}
string wave = Encoding.ASCII.GetString(wav, offset + 8, 4);
if (wave != "WAVE")
{
Con.Print("RIFF chunk is not WAVE\n");
return info;
}
// get "fmt " chunk
offset += 12; //iff_data = data_p + 12;
int fmt = helper.FindChunk("fmt ", offset);
if (fmt == -1)
{
Con.Print("Missing fmt chunk\n");
return info;
}
int format = helper.GetLittleShort(fmt + 8);
if (format != 1)
{
Con.Print("Microsoft PCM format only\n");
return info;
}
info.channels = helper.GetLittleShort(fmt + 10);
info.rate = helper.GetLittleLong(fmt + 12);
info.width = helper.GetLittleShort(fmt + 16 + 4 + 2) / 8;
// get cue chunk
int cue = helper.FindChunk("cue ", offset);
if (cue != -1)
{
info.loopstart = helper.GetLittleLong(cue + 32);
// if the next chunk is a LIST chunk, look for a cue length marker
int list = helper.FindChunk("LIST", cue);
if (list != -1)
{
string mark = Encoding.ASCII.GetString(wav, list + 28, 4);
if (mark == "mark")
{
// this is not a proper parse, but it works with cooledit...
int i = helper.GetLittleLong(list + 24); // samples in loop
info.samples = info.loopstart + i;
}
}
}
else
info.loopstart = -1;
// find data chunk
int data = helper.FindChunk("data", offset);
if (data == -1)
{
Con.Print("Missing data chunk\n");
return info;
}
int samples = helper.GetLittleLong(data + 4) / info.width;
if (info.samples > 0)
{
if (samples < info.samples)
Sys.Error("Sound {0} has a bad loop length", name);
}
else
info.samples = samples;
info.dataofs = data + 8;
return info;
}