openWave tries to open the specified file as a wave file and if succesfull, sets the file pointer positioned after the header.
(filename string)
| 177 | // openWave tries to open the specified file as a wave file |
| 178 | // and if succesfull, sets the file pointer positioned after the header. |
| 179 | func (af *AudioFile) openWave(filename string) error { |
| 180 | |
| 181 | // Open file |
| 182 | osf, err := os.Open(filename) |
| 183 | if err != nil { |
| 184 | return err |
| 185 | } |
| 186 | |
| 187 | // Reads header |
| 188 | header := make([]uint8, waveHeaderSize) |
| 189 | n, err := osf.Read(header) |
| 190 | if err != nil { |
| 191 | osf.Close() |
| 192 | return err |
| 193 | } |
| 194 | if n < waveHeaderSize { |
| 195 | osf.Close() |
| 196 | return fmt.Errorf("File size less than header") |
| 197 | } |
| 198 | // Checks file marks |
| 199 | if string(header[0:4]) != fileMark { |
| 200 | osf.Close() |
| 201 | return fmt.Errorf("'RIFF' mark not found") |
| 202 | } |
| 203 | if string(header[8:12]) != fileHead { |
| 204 | osf.Close() |
| 205 | return fmt.Errorf("'WAVE' mark not found") |
| 206 | } |
| 207 | |
| 208 | // Decodes header fields |
| 209 | af.info.Format = -1 |
| 210 | af.info.Channels = int(header[22]) + int(header[23])<<8 |
| 211 | af.info.SampleRate = int(header[24]) + int(header[25])<<8 + int(header[26])<<16 + int(header[27])<<24 |
| 212 | af.info.BitsSample = int(header[34]) + int(header[35])<<8 |
| 213 | af.info.DataSize = int(header[40]) + int(header[41])<<8 + int(header[42])<<16 + int(header[43])<<24 |
| 214 | |
| 215 | // Sets OpenAL format field if possible |
| 216 | if af.info.Channels == 1 { |
| 217 | if af.info.BitsSample == 8 { |
| 218 | af.info.Format = al.FormatMono8 |
| 219 | } else if af.info.BitsSample == 16 { |
| 220 | af.info.Format = al.FormatMono16 |
| 221 | } |
| 222 | } else if af.info.Channels == 2 { |
| 223 | if af.info.BitsSample == 8 { |
| 224 | af.info.Format = al.FormatStereo8 |
| 225 | } else if af.info.BitsSample == 16 { |
| 226 | af.info.Format = al.FormatStereo16 |
| 227 | } |
| 228 | } |
| 229 | if af.info.Format == -1 { |
| 230 | osf.Close() |
| 231 | return fmt.Errorf("Unsupported OpenAL format") |
| 232 | } |
| 233 | |
| 234 | // Calculates bytes/sec and total time |
| 235 | var bytesChannel int |
| 236 | if af.info.BitsSample == 8 { |
no test coverage detected