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65 lines
2 KiB
C
65 lines
2 KiB
C
#ifndef DEPENDENCY_AUDIO_DECODE_WAV
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//Stubs:
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//(none required)
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#else
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snd_sequence_struct *snd_decode_wav(uint8 *buffer,int32 bytes){
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//ref: https://ccrma.stanford.edu/courses/422/projects/WaveFormat/
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if (bytes<44) return NULL;
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if ((*(uint32*)&buffer[12])!=0x20746d66) return NULL;//"fmt "
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if ((*(uint16*)&buffer[20])!=1) return NULL;//PCM = 1 (i.e. Linear quantization) Values other than 1 indicate some form of compression.
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static int32 rif_type;
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rif_type=0;
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if ((*(uint32*)&buffer[0])==0x46464952) rif_type=1;//RIFF
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//if ((*(uint32*)&buffer[0])==0x????????) rif_type=1;//RIFX (not supported yet)
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if (rif_type==0) return NULL;
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static int32 out_bytes;
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static uint8 *bufout;
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static int32 chunk1size;
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chunk1size=*(uint32*)&buffer[16];
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//qbs_print(qbs_str((int32)chunk1size),1);
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//read next chunk
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static uint32 chunk2name;
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static int32 chunk2size;
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skip_chunk:
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if ((20+chunk1size)>=bytes) return NULL;//no more chunks!
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chunk2name=*(uint32*)&buffer[20+chunk1size];
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chunk2size=*(uint32*)&buffer[20+chunk1size+4];
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if (chunk2name!=0x61746164){
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chunk1size+=(8+chunk2size);
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goto skip_chunk;//it's probably a "fact" chunk, pointless for PCM data
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}
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out_bytes=chunk2size;
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bufout=(uint8*)malloc(out_bytes);
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memcpy(bufout,buffer+20+chunk1size+8,out_bytes);
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//qbs_print(qbs_str((int32)out_bytes),1);
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//attach to new sequence
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static int32 seq_handle; seq_handle=list_add(snd_sequences);
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static snd_sequence_struct *seq; seq=(snd_sequence_struct*)list_get(snd_sequences,seq_handle);
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memset(seq,0,sizeof(snd_sequence_struct));
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seq->references=1;
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seq->channels=*(uint16*)&buffer[22];
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seq->sample_rate=*(uint32*)&buffer[24];
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seq->bits_per_sample=*(uint16*)&buffer[34];
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seq->endian=1;//little (Microsoft format)
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seq->is_unsigned=0; if (seq->bits_per_sample==8) seq->is_unsigned=1;
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seq->data=(uint16*)bufout;
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seq->data_size=out_bytes;
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//qbs_print(qbs_str((int32)seq->channels),1);
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//qbs_print(qbs_str((int32)seq->sample_rate),1);
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//qbs_print(qbs_str((int32)seq->bits_per_sample),1);
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return seq;
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}
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#endif
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