125 lines
2.9 KiB
C++
125 lines
2.9 KiB
C++
/*
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* Overreact - Mr. 4th Dimention
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* Allen Webster
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* 03.21.2015 (mm.dd.yyyy)
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*
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* Audio Layer.
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*/
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internal void
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wav_open_file(char *filename, Wav_File *wav_file){
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File file = system_load_file(filename);
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if (file.data && file.size > sizeof(Wav_File)){
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*wav_file = {};
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wav_file->file = file;
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wav_file->header = *(Wav_Header*)file.data;
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Assert(wav_file->header.chunk.id == WAV_CHUNK_RIFF);
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Assert(wav_file->header.wav_id == WAV_CHUNK_WAVE);
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}
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}
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internal i32
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wav_data_requirement(Wav_File *wav_file){
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u8 *cursor = (u8*)wav_file->file.data + sizeof(Wav_Header);
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u64 size = wav_file->file.size;
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u8 *end = (u8*)wav_file->file.data + size;
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i32 requirement = 0;
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i32 channels = 0;
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while (1){
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Wav_Chunk chunk;
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chunk = *(Wav_Chunk*)cursor;
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if (chunk.id == WAV_CHUNK_data){
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Assert(requirement == 0);
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requirement = chunk.size;
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cursor += sizeof(Wav_Chunk) + chunk.size;
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if (chunk.size % 2 == 1){
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++cursor;
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}
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}
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else{
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if (chunk.id == WAV_CHUNK_fmt){
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Wav_Format_Chunk_16 fmt;
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fmt = *(Wav_Format_Chunk_16*)(cursor);
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channels = fmt.channels;
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}
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cursor += sizeof(Wav_Chunk) + chunk.size;
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}
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if (cursor >= end){
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break;
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}
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}
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return requirement*(2/channels) + 4;
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}
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internal bool32
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wav_fill_sound(Wav_File *wav_file, Sound *sound,
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i32 system_sample_per_second){
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u8 *cursor = (u8*)wav_file->file.data + sizeof(Wav_Header);
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u64 size = wav_file->file.size;
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u8 *end = (u8*)wav_file->file.data + size;
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bool32 found_data = 0;
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while (1){
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Wav_Chunk chunk;
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chunk = *(Wav_Chunk*)cursor;
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if (chunk.id == WAV_CHUNK_data){
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Assert(found_data == 0);
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found_data = 1;
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sound->memory_size = chunk.size*(2/sound->channels);
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sound->sample_count = (chunk.size/sound->channels)/sound->bytes_per_sample;
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i16 *sample_src = (i16*)(cursor + sizeof(Wav_Chunk));
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i16 *sample_dest = sound->samples;
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if (sound->channels == 1){
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for (i32 i = 0; i < sound->sample_count; ++i){
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*sample_dest++ = *sample_src;
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*sample_dest++ = *sample_src++;
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}
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*sample_dest++ = 0;
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*sample_dest++ = 0;
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}
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else{
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for (i32 i = 0; i < sound->sample_count; ++i){
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*sample_dest++ = *sample_src++;
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*sample_dest++ = *sample_src++;
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}
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*sample_dest++ = 0;
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*sample_dest++ = 0;
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}
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cursor += sizeof(Wav_Chunk) + chunk.size;
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if (chunk.size % 2 == 1){
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++cursor;
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}
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}
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else{
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if (chunk.id == WAV_CHUNK_fmt){
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Wav_Format_Chunk_16 fmt;
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fmt = *(Wav_Format_Chunk_16*)(cursor);
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Assert(fmt.channels == 1 || fmt.channels == 2);
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sound->channels = fmt.channels;
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sound->samples_per_second = fmt.samples_per_second;
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sound->bytes_per_sample = fmt.bits_per_sample >> 3;
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sound->scan_speed = ((real32)sound->samples_per_second/system_sample_per_second);
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}
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cursor += sizeof(Wav_Chunk) + chunk.size;
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}
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if (cursor >= end){
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break;
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}
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}
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return found_data;
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}
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