public bool LoadSong(string filename, List <BpmChangeEvent> bpmChanges)
{
IsFinished = false;
streamHandle = SDL_mixer.Mix_LoadMUS(filename);
Globals.BpmEvents = bpmChanges;
Globals.BpmEvents = Globals.BpmEvents.OrderBy(x => x.StartBeat).ToList();
for (int i = 0; i < Globals.BpmEvents.Count; i++)
{
if (i > 0)
{
Globals.BpmEvents[i].StartSeconds = (Globals.BpmEvents[i].StartBeat - Globals.BpmEvents[i - 1].StartBeat) / Globals.BpmEvents[i - 1].BPM * 60 + Globals.BpmEvents[i - 1].StartSeconds;
}
}
//SongBpm = bpm;
// Globals.CurrentBpm = Globals.BpmEvents[0].BPM;
// create hooks here
SDL_mixer.Mix_HookMusic(MixDelegate, IntPtr.Zero);
SDL_mixer.Mix_HookMusicFinished(FinishedDelegate);
// Use the left channel for grabbing this info for now.
// Is this correct? I'm not sure.
IntPtr leftChannelMixChunk = SDL_mixer.Mix_GetChunk(leftChannel);
SDL_mixer.Mix_QuerySpec(out frequency, out format, out channels);
unsafe
{
byte *pLeftChannel = (byte *)leftChannelMixChunk.ToPointer();
if (pLeftChannel != null)
{
/*
* typedef struct Mix_Chunk {
* int allocated;
* Uint8 *abuf;
* Uint32 alen;
* Uint8 volume;
* } Mix_Chunk;
* get the value of alen within this struct
* refer to https://www.libsdl.org/projects/SDL_mixer/docs/SDL_mixer.html#SEC85 for more details
*/
SongLengthBytes = *(pLeftChannel + sizeof(int) + sizeof(byte));
SongLengthSec = GetCurrentSec(SongLengthBytes);
}
}
return(streamHandle == IntPtr.Zero ? false : true);
}