void DTSStream::Init ( const int _stream_num)
{
stream_num = _stream_num;
MuxStream::Init( PRIVATE_STR_1,
1, // Buffer scale
default_buffer_size,
false,
muxinto.buffers_in_audio,
muxinto.always_buffers_in_audio
);
mjpeg_info ("Scanning for header info: dts Audio stream %02x (%s)",
stream_num,
bs.StreamName()
);
AU_start = bs.bitcount();
if (bs.GetBits(32)==DTS_SYNCWORD)
{
num_syncword++;
bs.GetBits(6); // additional sync
bs.GetBits(1); // CRC
bs.GetBits(7); // pcm samples
framesize = bs.GetBits(14) + 1; // frame size
bs.GetBits(6); // audio channels
frequency = bs.GetBits(4); // sample rate code
bit_rate = dts_bitrate_index[bs.GetBits(5)];
bs.GetBits(5); // misc.
header_skip = 10; // Initially skipped past 10 bytes of header
num_frames++;
access_unit.start = AU_start;
access_unit.length = framesize;
mjpeg_info( "dts frame size = %d", framesize );
samples_per_second = dts_frequency[frequency];
/* Presentation time-stamping */
access_unit.PTS = static_cast<clockticks>(decoding_order) *
static_cast<clockticks>(DTS_PACKET_SAMPLES) *
static_cast<clockticks>(CLOCKS) / samples_per_second;
access_unit.DTS = access_unit.PTS;
access_unit.dorder = decoding_order;
++decoding_order;
aunits.Append( access_unit );
} else
{
mjpeg_error ( "Invalid dts Audio stream header.");
exit (1);
}
OutputHdrInfo();
}
void LPCMStream::Init ( const int _stream_num)
{
stream_num = _stream_num;
header_skip = 0;
MuxStream::Init( PRIVATE_STR_1,
1, // Buffer scale
default_buffer_size,
false,
muxinto.buffers_in_audio,
muxinto.always_buffers_in_audio
);
// This seems to be necessary not only for some software players but
// for some standalone players too. Yuck... shades of the VCD audio
// sectors.
min_pes_header_len = 10;
mjpeg_info ("Scanning for header info: LPCM Audio stream %02x (%s)",
stream_num,
bs.StreamName()
);
AU_start = bs.bitcount();
// This is a dummy debug version that simply assumes 48kHz
// two channel 16 bit sample LPCM
samples_per_second = parms->SamplesPerSec();
channels = parms->Channels();
bits_per_sample = parms->BitsPerSample();
bytes_per_frame =
samples_per_second * channels * bits_per_sample / 8
* ticks_per_frame_90kHz
/ 90000;
frame_index = 0;
dynamic_range_code = 0x80;
/* Presentation/decoding time-stamping */
access_unit.start = AU_start;
access_unit.length = bytes_per_frame;
access_unit.PTS = static_cast<clockticks>(decoding_order) *
(CLOCKS_per_90Kth_sec * ticks_per_frame_90kHz);
access_unit.DTS = access_unit.PTS;
access_unit.dorder = decoding_order;
decoding_order++;
aunits.Append( access_unit );
OutputHdrInfo();
}
void MPAStream::Init ( const int stream_num )
{
int padding_bit;
MuxStream::Init( AUDIO_STR_0 + stream_num,
0, // Buffer scale
muxinto.audio_buffer_size,
muxinto.vcd_zero_stuffing,
muxinto.buffers_in_audio,
muxinto.always_buffers_in_audio
);
mjpeg_info ("Scanning for header info: Audio stream %02x (%s)",
AUDIO_STR_0 + stream_num,
bs.StreamName()
);
/* A.Stevens 2000 - update to be compatible up to MPEG2.5
*/
AU_start = bs.bitcount();
if (bs.GetBits(11)==AUDIO_SYNCWORD)
{
num_syncword++;
version_id = bs.GetBits( 2);
layer = 3-bs.GetBits( 2); /* 0..2 not 1..3!! */
protection = bs.Get1Bit();
bit_rate_code = bs.GetBits( 4);
frequency = bs.GetBits( 2);
padding_bit = bs.Get1Bit();
bs.Get1Bit();
mode = bs.GetBits( 2);
mode_extension = bs.GetBits( 2);
copyright = bs.Get1Bit();
original_copy = bs.Get1Bit ();
emphasis = bs.GetBits( 2);
framesize =
mpa_bitrates_kbps[version_id][layer][bit_rate_code] *
mpa_slots[layer] *1000 /
mpa_freq_table[version_id][frequency];
size_frames[0] = framesize * ( layer == 0 ? 4 : 1);
size_frames[1] = (framesize+1) * ( layer == 0 ? 4 : 1);
num_frames[padding_bit]++;
access_unit.start = AU_start;
access_unit.length = size_frames[padding_bit];
samples_per_second = mpa_freq_table[version_id][frequency];
/* Presentation time-stamping */
access_unit.PTS = static_cast<clockticks>(decoding_order) *
static_cast<clockticks>(mpa_samples [layer]) *
static_cast<clockticks>(CLOCKS) / samples_per_second;
access_unit.DTS = access_unit.PTS;
access_unit.dorder = decoding_order;
++decoding_order;
aunits.Append( access_unit );
} else
{
mjpeg_error_exit1 ( "Invalid MPEG Audio stream header.");
// exit (1);
}
OutputHdrInfo();
}
