// Read
//
// Returns number of bytes actually read.
//
// Returns -1 if there is nothing more to be read. This function can return 0, since
// sometimes the amount of bytes requested is too small for the ACM decompression to
// locate a suitable block
int WaveFile::Read(BYTE *pbDest, UINT cbSize, int service)
{
unsigned char *dest_buf=NULL, *uncompressed_wave_data;
int rc, uncompressed_bytes_written;
unsigned int src_bytes_used, convert_len, num_bytes_desired=0, num_bytes_read;
// nprintf(("Alan","Reqeusted: %d\n", cbSize));
if ( service ) {
uncompressed_wave_data = Wavedata_service_buffer;
} else {
uncompressed_wave_data = Wavedata_load_buffer;
}
switch ( m_wave_format ) {
case WAVE_FORMAT_PCM:
num_bytes_desired = cbSize;
dest_buf = pbDest;
break;
case WAVE_FORMAT_ADPCM:
if ( !m_hStream_open ) {
if ( !ACM_stream_open(m_pwfmt_original, &m_wfxDest, (void**)&m_hStream), m_bits_per_sample_uncompressed ) {
m_hStream_open = 1;
} else {
Int3();
}
}
num_bytes_desired = cbSize;
if ( service ) {
dest_buf = Compressed_service_buffer;
} else {
dest_buf = Compressed_buffer;
}
if ( num_bytes_desired <= 0 ) {
num_bytes_desired = 0;
// nprintf(("Alan","No bytes required for ADPCM time interval\n"));
} else {
num_bytes_desired = ACM_query_source_size((void*)m_hStream, cbSize);
// nprintf(("Alan","Num bytes desired: %d\n", num_bytes_desired));
}
break;
default:
nprintf(("SOUND", "SOUND => Not supporting %d format for playing wave files\n"));
Int3();
break;
} // end switch
num_bytes_read = 0;
convert_len = 0;
src_bytes_used = 0;
// read data from disk
if ( m_data_bytes_left <= 0 ) {
num_bytes_read = 0;
uncompressed_bytes_written = 0;
return -1;
}
if ( m_data_bytes_left > 0 && num_bytes_desired > 0 ) {
int actual_read;
if ( num_bytes_desired <= (unsigned int)m_data_bytes_left ) {
num_bytes_read = num_bytes_desired;
}
else {
num_bytes_read = m_data_bytes_left;
}
actual_read = mmioRead( cfp, (char *)dest_buf, num_bytes_read );
if ( (actual_read <= 0) || (m_abort_next_read) ) {
num_bytes_read = 0;
uncompressed_bytes_written = 0;
return -1;
}
if ( num_bytes_desired >= (unsigned int)m_data_bytes_left ) {
m_abort_next_read = 1;
}
num_bytes_read = actual_read;
}
// convert data if necessary, to PCM
if ( m_wave_format == WAVE_FORMAT_ADPCM ) {
if ( num_bytes_read > 0 ) {
rc = ACM_convert((void*)m_hStream, dest_buf, num_bytes_read, uncompressed_wave_data, BIGBUF_SIZE, &convert_len, &src_bytes_used);
if ( rc == -1 ) {
goto READ_ERROR;
}
if ( convert_len == 0 ) {
Int3();
}
}
Assert(src_bytes_used <= num_bytes_read);
if ( src_bytes_used < num_bytes_read ) {
// seek back file pointer to reposition before unused source data
mmioSeek(cfp, src_bytes_used - num_bytes_read, SEEK_CUR);
}
// Adjust number of bytes left
m_data_bytes_left -= src_bytes_used;
m_nBytesPlayed += src_bytes_used;
uncompressed_bytes_written = convert_len;
// Successful read, keep running total of number of data bytes read
goto READ_DONE;
}
else {
// Successful read, keep running total of number of data bytes read
// Adjust number of bytes left
m_data_bytes_left -= num_bytes_read;
m_nBytesPlayed += num_bytes_read;
uncompressed_bytes_written = num_bytes_read;
goto READ_DONE;
}
READ_ERROR:
num_bytes_read = 0;
uncompressed_bytes_written = 0;
READ_DONE:
m_total_uncompressed_bytes_read += uncompressed_bytes_written;
// nprintf(("Alan","Read: %d\n", uncompressed_bytes_written));
return (uncompressed_bytes_written);
}
// Read
//
// Returns number of bytes actually read.
//
// Returns -1 if there is nothing more to be read. This function can return 0, since
// sometimes the amount of bytes requested is too small for the ACM decompression to
// locate a suitable block
int WaveFile::Read(BYTE* pbDest, UINT cbSize, int service)
{
unsigned char* dest_buf = NULL, *uncompressed_wave_data;
int rc, uncompressed_bytes_written, section, last_section = -1, byte_order = 0;
unsigned int src_bytes_used, convert_len, num_bytes_desired = 0, num_bytes_read;
// nprintf(("Alan","Reqeusted: %d\n", cbSize));
#if BYTE_ORDER == BIG_ENDIAN
byte_order = 1;
#endif
if (service)
{
uncompressed_wave_data = Wavedata_service_buffer;
}
else
{
uncompressed_wave_data = Wavedata_load_buffer;
}
switch (m_wave_format)
{
case WAVE_FORMAT_PCM:
num_bytes_desired = cbSize;
dest_buf = pbDest;
break;
case WAVE_FORMAT_ADPCM:
if (!m_hStream_open)
{
if (!ACM_stream_open(m_pwfmt_original, &m_wfxDest, (void**)&m_hStream), m_wfmt.wBitsPerSample)
{
m_hStream_open = 1;
}
else
{
Int3();
}
}
num_bytes_desired = cbSize;
if (service)
{
dest_buf = Compressed_service_buffer;
}
else
{
dest_buf = Compressed_buffer;
}
if (num_bytes_desired <= 0)
{
num_bytes_desired = 0;
// nprintf(("Alan","No bytes required for ADPCM time interval\n"));
}
else
{
num_bytes_desired = ACM_query_source_size((void*)m_hStream, cbSize);
// nprintf(("Alan","Num bytes desired: %d\n", num_bytes_desired));
}
break;
case OGG_FORMAT_VORBIS:
num_bytes_desired = cbSize;
dest_buf = pbDest;
break;
default:
nprintf(("SOUND", "SOUND => Not supporting %d format for playing wave files\n"));
Int3();
break;
} // end switch
num_bytes_read = 0;
convert_len = 0;
src_bytes_used = 0;
// read data from disk
if (m_data_bytes_left <= 0)
{
num_bytes_read = 0;
uncompressed_bytes_written = 0;
return -1;
}
if ((m_data_bytes_left > 0) && (num_bytes_desired > 0))
{
int actual_read = 0;
if (num_bytes_desired <= (uint)m_data_bytes_left)
{
num_bytes_read = num_bytes_desired;
}
else
{
num_bytes_read = m_data_bytes_left;
}
// OGG reading is special
if (m_wave_format == OGG_FORMAT_VORBIS)
{
while (!m_abort_next_read && ((uint)actual_read < num_bytes_read))
{
rc = ov_read(&m_snd_info.vorbis_file, (char*)dest_buf + actual_read, num_bytes_read - actual_read,
byte_order, m_wfmt.wBitsPerSample / 8, 1, §ion);
// fail if the bitstream changes, shouldn't get this far if that's the case though
if ((last_section != -1) && (last_section != section))
{
mprintf(("AUDIOSTR => OGG reading error: We don't handle bitstream changes!\n"));
goto READ_ERROR;
}
if (rc > 0)
{
last_section = section;
actual_read += rc;
}
else if (rc == 0)
{
break;
}
else if (rc == OV_EBADLINK)
{
goto READ_ERROR;
}
}
}
// standard WAVE reading
else
{
actual_read = mmioRead(m_snd_info.cfp, (char*)dest_buf, num_bytes_read);
}
if ((actual_read <= 0) || (m_abort_next_read))
{
num_bytes_read = 0;
uncompressed_bytes_written = 0;
return -1;
}
if (num_bytes_desired >= (uint)m_data_bytes_left)
{
m_abort_next_read = 1;
}
num_bytes_read = actual_read;
}
// convert data if necessary, to PCM
if (m_wave_format == WAVE_FORMAT_ADPCM)
{
if (num_bytes_read > 0)
{
rc = ACM_convert((void*)m_hStream, dest_buf, num_bytes_read, uncompressed_wave_data,
BIGBUF_SIZE, &convert_len, &src_bytes_used);
if (rc == -1)
{
goto READ_ERROR;
}
if (convert_len == 0)
{
Int3();
}
}
Assert(src_bytes_used <= num_bytes_read);
if (src_bytes_used < num_bytes_read)
{
// seek back file pointer to reposition before unused source data
mmioSeek(m_snd_info.cfp, src_bytes_used - num_bytes_read, SEEK_CUR);
}
// Adjust number of bytes left
m_data_bytes_left -= src_bytes_used;
m_nBytesPlayed += src_bytes_used;
uncompressed_bytes_written = convert_len;
// Successful read, keep running total of number of data bytes read
goto READ_DONE;
}
else
{
// Successful read, keep running total of number of data bytes read
// Adjust number of bytes left
m_data_bytes_left -= num_bytes_read;
m_nBytesPlayed += num_bytes_read;
uncompressed_bytes_written = num_bytes_read;
goto READ_DONE;
}
READ_ERROR:
num_bytes_read = 0;
uncompressed_bytes_written = 0;
READ_DONE:
m_total_uncompressed_bytes_read += uncompressed_bytes_written;
// nprintf(("Alan","Read: %d\n", uncompressed_bytes_written));
return (uncompressed_bytes_written);
}
