/**
* @brief Encoder initialization.
* @param Freq: Sampling frequency.
* @param pHeader: Pointer to the WAV file header to be written.
* @retval 0 if success, !0 else.
*/
uint32_t WavProcess_EncInit(uint32_t Freq, uint8_t* pHeader)
{
if (WavEncInited)
{
return 1;
}
/* Initialize the encoder structure */
EncWavFmtStruct.SampleRate = Freq; /* Audio sampling frequency */
EncWavFmtStruct.NumChannels = 2; /* Number of channels: 1:Mono or 2:Stereo */
EncWavFmtStruct.BitsPerSample = 16; /* Number of bits per sample (16, 24 or 32) */
EncWavFmtStruct.AudioLength = 0; /* Total length of useful audio data (payload) */
EncWavFmtStruct.AudioStartAddr = 44; /* Relative start address of audio payload */
EncWavFmtStruct.RIFFchunksize = 44; /* The file header chunk size */
EncWavFmtStruct.FormatTag = 1; /* Audio file format: PCM = 1 */
EncWavFmtStruct.ByteRate = (EncWavFmtStruct.SampleRate * \
(EncWavFmtStruct.BitsPerSample/8) * \
EncWavFmtStruct.NumChannels); /* Number of bytes per second (sample rate * block align) */
EncWavFmtStruct.BlockAlign = EncWavFmtStruct.NumChannels * \
(EncWavFmtStruct.BitsPerSample/8); /* channels * bits/sample / 8 */
EncWavFmtStruct.DataSize = 0; /* Total length of useful audio data (payload) */
/* Parse the wav file header and extract required information */
if (WavProcess_HeaderInit(pHeader, &EncWavFmtStruct))
{
return 1;
}
WavEncInited = 1;
return 0;
}
/**
* @brief Encoder initialization.
* @param Freq: Sampling frequency.
* @param pHeader: Pointer to the WAV file header to be written.
* @retval 0 if success, !0 else.
*/
static uint32_t WavProcess_EncInit(uint32_t Freq, uint8_t* pHeader)
{
/* Initialize the encoder structure */
WaveFormat.SampleRate = Freq; /* Audio sampling frequency */
WaveFormat.NbrChannels = 2; /* Number of channels: 1:Mono or 2:Stereo */
WaveFormat.BitPerSample = 16; /* Number of bits per sample (16, 24 or 32) */
WaveFormat.FileSize = 0x001D4C00; /* Total length of useful audio data (payload) */
WaveFormat.SubChunk1Size = 44; /* The file header chunk size */
WaveFormat.ByteRate = (WaveFormat.SampleRate * \
(WaveFormat.BitPerSample/8) * \
WaveFormat.NbrChannels); /* Number of bytes per second (sample rate * block align) */
WaveFormat.BlockAlign = WaveFormat.NbrChannels * \
(WaveFormat.BitPerSample/8); /* channels * bits/sample / 8 */
/* Parse the wav file header and extract required information */
if(WavProcess_HeaderInit(pHeader, &WaveFormat))
{
return 1;
}
return 0;
}
