//-------------------------------------------------
// read_flac_sample - read a FLAC file as a sample
//-------------------------------------------------
static bool read_flac_sample(emu_file file, sample_t sample)
{
// seek back to the start of the file
file.seek(0, SEEK_SET);
// create the FLAC decoder and fill in the sample data
flac_decoder decoder = new flac_decoder(file.core_file_get());
sample.frequency = decoder.sample_rate();
// error if more than 1 channel or not 16bpp
if (decoder.channels() != 1)
{
return(false);
}
if (decoder.bits_per_sample() != 16)
{
return(false);
}
// resize the array and read
sample.data.resize(decoder.total_samples());
if (!decoder.decode_interleaved(sample.data, (uint32_t)sample.data.Count))
{
return(false);
}
// finish up and clean up
decoder.finish();
return(true);
}
// dynamic control
//void set_frequency(UINT8 channel, UINT32 frequency);
//void set_volume(UINT8 channel, float volume);
// helpers
//-------------------------------------------------
// read_sample - read a WAV or FLAC file as a
// sample
//-------------------------------------------------
static bool read_sample(emu_file file, sample_t sample)
{
// read the core header and make sure it's a proper file
MemoryU8 buf = new MemoryU8(4, true); //uint8_t buf[4];
uint32_t offset = file.read(new Pointer <uint8_t>(buf), 4);
if (offset < 4)
{
osd_printf_warning("Unable to read {0}, 0-byte file?\n", file.filename());
return(false);
}
// look for the appropriate RIFF tag
if (buf[0] == 'R' && buf[1] == 'I' && buf[2] == 'F' && buf[3] == 'F') // memcmp(&buf[0], "RIFF", 4) == 0)
{
return(read_wav_sample(file, sample));
}
else if (buf[0] == 'f' && buf[1] == 'L' && buf[2] == 'a' && buf[3] == 'C') // memcmp(&buf[0], "fLaC", 4) == 0)
{
return(read_flac_sample(file, sample));
}
// if nothing appropriate, emit a warning
osd_printf_warning("Unable to read {0}, corrupt file?\n", file.filename());
return(false);
}
//-------------------------------------------------
// device_post_load - handle updating after a
// restore
//-------------------------------------------------
protected override void device_post_load()
{
// loop over channels
for (int channel = 0; channel < m_channels; channel++)
{
// attach any samples that were loaded and playing
channel_t chan = m_channel[channel];
if (chan.source_num >= 0 && chan.source_num < m_sample.Count)
{
sample_t sample = m_sample[chan.source_num];
chan.source = sample.data;
chan.source_length = sample.data.Count;
if (sample.data.Count == 0)
{
chan.source_num = -1;
}
}
// validate the position against the length in case the sample is smaller
if (chan.source != null && chan.pos >= chan.source_length)
{
if (chan.loop)
{
chan.pos %= (UInt32)chan.source_length;
}
else
{
chan.source = null;
chan.source_num = -1;
}
}
}
}
//-------------------------------------------------
// device_post_load - handle updating after a
// restore
//-------------------------------------------------
protected override void device_post_load()
{
// loop over channels
for (int channel = 0; channel < m_channels; channel++)
{
// attach any samples that were loaded and playing
channel_t chan = m_channel[channel];
if (chan.source_num >= 0 && chan.source_num < m_sample.Count)
{
sample_t sample = m_sample[chan.source_num];
chan.source = new Pointer <int16_t>(sample.data); //chan.source = &sample.data[0];
chan.source_len = (u32)sample.data.size();
if (sample.data.Count == 0)
{
chan.source_num = -1;
}
}
// validate the position against the length in case the sample is smaller
double endpos = chan.source_len;
if (chan.source != null && chan.pos >= endpos)
{
if (chan.loop)
{
double posfloor = std.floor(chan.pos);
chan.pos -= posfloor;
chan.pos += (double)((int32_t)posfloor % chan.source_len);
}
else
{
chan.source = null;
chan.source_num = -1;
}
}
}
}
// internal helpers
//-------------------------------------------------
// read_wav_sample - read a WAV file as a sample
//-------------------------------------------------
static bool read_wav_sample(emu_file file, sample_t sample)
{
// we already read the opening 'RIFF' tag
uint32_t offset = 4;
// get the total size
uint32_t filesize;
MemoryU8 filesizeBuffer = new MemoryU8(4, true);
offset += file.read(new Pointer <uint8_t>(filesizeBuffer), 4);
if (offset < 8)
{
osd_printf_warning("Unexpected size offset {0} ({1})\n", offset, file.filename());
return(false);
}
filesize = filesizeBuffer.GetUInt32();
filesize = little_endianize_int32(filesize);
// read the RIFF file type and make sure it's a WAVE file
MemoryU8 buf = new MemoryU8(32, true); //char [] buf = new char[32];
offset += file.read(new Pointer <uint8_t>(buf), 4);
if (offset < 12)
{
osd_printf_warning("Unexpected WAVE offset {0} ({1})\n", offset, file.filename());
return(false);
}
if (!(buf[0] == 'W' && buf[1] == 'A' && buf[2] == 'V' && buf[3] == 'E')) // memcmp(&buf[0], "WAVE", 4) != 0)
{
osd_printf_warning("Could not find WAVE header ({0})\n", file.filename());
return(false);
}
// seek until we find a format tag
uint32_t length;
MemoryU8 lengthBuffer = new MemoryU8(4, true);
while (true)
{
offset += file.read(new Pointer <uint8_t>(buf), 4);
offset += file.read(new Pointer <uint8_t>(lengthBuffer), 4);
length = lengthBuffer.GetUInt32();
length = little_endianize_int32(length);
if (buf[0] == 'f' && buf[1] == 'm' && buf[2] == 't' && buf[3] == ' ') //if (memcmp(&buf[0], "fmt ", 4) == 0)
{
break;
}
// seek to the next block
file.seek(length, SEEK_CUR);
offset += length;
if (offset >= filesize)
{
osd_printf_warning("Could not find fmt tag ({0})\n", file.filename());
return(false);
}
}
// read the format -- make sure it is PCM
uint16_t temp16;
MemoryU8 temp16Buffer = new MemoryU8(2, true);
offset += file.read(new Pointer <uint8_t>(temp16Buffer), 2);
temp16 = temp16Buffer.GetUInt16();
temp16 = little_endianize_int16(temp16);
if (temp16 != 1)
{
osd_printf_warning("unsupported format {0} - only PCM is supported ({1})\n", temp16, file.filename());
return(false);
}
// number of channels -- only mono is supported
offset += file.read(new Pointer <uint8_t>(temp16Buffer), 2);
temp16 = temp16Buffer.GetUInt16();
temp16 = little_endianize_int16(temp16);
if (temp16 != 1)
{
osd_printf_warning("unsupported number of channels {0} - only mono is supported ({1})\n", temp16, file.filename());
return(false);
}
// sample rate
uint32_t rate;
MemoryU8 rateBuffer = new MemoryU8(4, true);
offset += file.read(new Pointer <uint8_t>(rateBuffer), 4);
rate = rateBuffer.GetUInt32();
rate = little_endianize_int32(rate);
// bytes/second and block alignment are ignored
offset += file.read(new Pointer <uint8_t>(buf), 6);
// bits/sample
uint16_t bits;
MemoryU8 bitsBuffer = new MemoryU8(2, true);
offset += file.read(new Pointer <uint8_t>(bitsBuffer), 2);
bits = bitsBuffer.GetUInt16();
bits = little_endianize_int16(bits);
if (bits != 8 && bits != 16)
{
osd_printf_warning("unsupported bits/sample {0} - only 8 and 16 are supported ({1})\n", bits, file.filename());
return(false);
}
// seek past any extra data
file.seek(length - 16, SEEK_CUR);
offset += length - 16;
// seek until we find a data tag
while (true)
{
offset += file.read(new Pointer <uint8_t>(buf), 4);
offset += file.read(new Pointer <uint8_t>(lengthBuffer), 4);
length = lengthBuffer.GetUInt32();
length = little_endianize_int32(length);
if (buf[0] == 'd' && buf[1] == 'a' && buf[2] == 't' && buf[3] == 'a') //if (memcmp(&buf[0], "data", 4) == 0)
{
break;
}
// seek to the next block
file.seek(length, SEEK_CUR);
offset += length;
if (offset >= filesize)
{
osd_printf_warning("Could not find data tag ({0})\n", file.filename());
return(false);
}
}
// if there was a 0 length data block, we're done
if (length == 0)
{
osd_printf_warning("empty data block ({0})\n", file.filename());
return(false);
}
// fill in the sample data
sample.frequency = rate;
// read the data in
if (bits == 8)
{
sample.data.resize(length);
MemoryU8 sample_data_8bit = new MemoryU8((int)length, true);
file.read(new Pointer <uint8_t>(sample_data_8bit), length);
// convert 8-bit data to signed samples
Pointer <uint8_t> tempptr = new Pointer <uint8_t>(sample_data_8bit); //uint8_t *tempptr = reinterpret_cast<uint8_t *>(&sample.data[0]);
for (int sindex = (int)length - 1; sindex >= 0; sindex--)
{
sample.data[sindex] = (int16_t)((uint8_t)(tempptr[sindex] ^ 0x80) * 256);
}
}
else
{
// 16-bit data is fine as-is
sample.data.resize(length / 2);
MemoryU8 sample_data_8bit = new MemoryU8((int)length, true);
file.read(new Pointer <uint8_t>(sample_data_8bit), length);
// swap high/low on big-endian systems
if (ENDIANNESS_NATIVE != ENDIANNESS_LITTLE)
{
for (uint32_t sindex = 0; sindex < length / 2; sindex++)
{
sample.data[sindex] = (int16_t)little_endianize_int16(sample_data_8bit.GetUInt16((int)sindex)); //sample.data[sindex]);
}
}
}
return(true);
}