unsafe int getSubstreamHeaderLen(byte[] substream_buf, int substream_off, int substream_len)
{
if (substream_len <= 4)
return(0);
fixed(byte *p = &substream_buf[substream_off])
{
var fr = new FrameReader(p, substream_len);
var hdr = new SUB_HEADER(fr);
switch (hdr.stream_id)
{
case DVDA.PCM_STREAM_ID:
case DVDA.MLP_STREAM_ID:
return(SUB_HEADER.SIZE + hdr.extra_len);
default:
return(0);
}
}
}
unsafe void getPS1Params(byte[] ps1_header, int ps1_len)
{
ch_assignment = -1;
gr1_frequency = 0;
gr1_bits = 0;
gr2_frequency = 0;
gr2_bits = 0;
vbr = false;
peak_bitrate = 0;
substreams = 0;
cci = 0;
if (ps1_len == 0)
return;
fixed(byte *p_ps1_header = &ps1_header[0])
{
var fr = new FrameReader(p_ps1_header, ps1_len);
sh = new SUB_HEADER(fr);
switch (sh.stream_id)
{
case DVDA.PCM_STREAM_ID:
{
if (sh.extra_len < PCM_EXTRAHEADER.SIZE)
{
break;
}
PCM_EXTRAHEADER pcm_ehdr = new PCM_EXTRAHEADER(fr);
cci = pcm_ehdr.cci;
ch_assignment = pcm_ehdr.channel_assignment;
decode_grp1_bits(pcm_ehdr.group1_bits);
decode_grp2_bits(pcm_ehdr.group2_bits);
decode_grp1_freq(pcm_ehdr.group1_freq);
decode_grp2_freq(pcm_ehdr.group2_freq);
vbr = false;
peak_bitrate = gr1_channels * gr1_frequency * gr1_bits + gr2_channels * gr2_frequency * gr2_bits;
substreams = 1;
break;
}
case DVDA.MLP_STREAM_ID:
{
if (sh.extra_len < MLP_EXTRAHEADER.SIZE)
{
break;
}
MLP_EXTRAHEADER mlp_ehdr = new MLP_EXTRAHEADER(fr);
fr.skip(sh.extra_len - MLP_EXTRAHEADER.SIZE);
while (fr.Length > MLP_LINK.SIZE + MLP_SIGNATURE.SIZE)
{
FrameReader fr1 = new FrameReader(fr, MLP_LINK.SIZE + MLP_SIGNATURE.SIZE);
fr1.skip(MLP_LINK.SIZE);
MLP_SIGNATURE mlp_sign = new MLP_SIGNATURE(fr1);
if (mlp_sign.signature1 != 0xF8726FBB /*|| p_mlp_sign->signature2 != 0xB752*/)
{
fr.skip(1);
continue;
}
cci = mlp_ehdr.cci;
fr.skip(MLP_LINK.SIZE);
ch_assignment = mlp_sign.channel_assignment;
decode_grp1_bits(mlp_sign.group1_bits);
decode_grp2_bits(mlp_sign.group2_bits);
decode_grp1_freq(mlp_sign.group1_freq);
decode_grp2_freq(mlp_sign.group2_freq);
vbr = (mlp_sign.bitrate & 0x8000) != 0;
peak_bitrate = ((mlp_sign.bitrate & ~0x8000) * gr1_frequency + 8) >> 4;
substreams = mlp_sign.substreams;
break;
}
break;
}
}
}
}
