private void OnAACHeader(RTMPMessage msg)
{
using (var s = new MemoryStream(msg.Body, false)) {
s.Seek(2, SeekOrigin.Current);
using (var bs = new BitReader(s, true)) {
var type = bs.ReadBits(5);
if (type == 31)
{
type = bs.ReadBits(6) + 32;
}
var sampling_freq_idx = bs.ReadBits(4);
var sampling_freq = sampling_freq_idx == 0x0F ? bs.ReadBits(24) : sampling_freq_idx;
var channel_configuration = bs.ReadBits(4);
this.adtsHeader = new ADTSHeader(
0xFFF, //sync
0, //ID
0, //Layer
true, //CRC Absent
type - 1, //Profile
sampling_freq_idx, //Sampling frequency index
0, //Private
channel_configuration, //Channel configuration
0, //Original/Copy
0, //home
0, //Copyright identification bit
0, //Copyright identification start
0, //frame length
0x7FF, //buffer fullness
0, //number of raw data blocks in frame
0 //CRC
);
}
}
}
private void Clear()
{
pps = new NALUnit[0];
sps = new NALUnit[0];
spsExt = new NALUnit[0];
pat = new ProgramAssociationTable();
pmt = new ProgramMapTable();
adtsHeader = ADTSHeader.Default;
nalSizeLen = 0;
ptsBase = -1;
}
public ADTSHeader(
ADTSHeader other,
int frame_length)
{
this.Sync = other.Sync;
this.Id = other.Id;
this.Layer = other.Layer;
this.CRCAbsent = other.CRCAbsent;
this.Profile = other.Profile;
this.SamplingFreqIndex = other.SamplingFreqIndex;
this.IsPrivate = other.IsPrivate;
this.ChannelConfigurtion = other.ChannelConfigurtion;
this.IsOriginal = other.IsOriginal;
this.IsHome = other.IsHome;
this.CopyrightIdBit = other.CopyrightIdBit;
this.CopyrightIdStart = other.CopyrightIdStart;
this.FrameLength = frame_length;
this.BufferFullness = other.BufferFullness;
this.RawDataBlocks = other.RawDataBlocks;
this.CRC = other.CRC;
}
private void OnAACBody(RTMPMessage msg)
{
var pts = msg.Timestamp - Math.Max(0, ptsBase);
var raw_length = msg.Body.Length - 2;
var header = new ADTSHeader(adtsHeader, raw_length + adtsHeader.Bytesize);
var pes_payload = new MemoryStream();
using (pes_payload) {
ADTSHeader.WriteTo(pes_payload, header);
pes_payload.Write(msg.Body, 2, raw_length);
}
var pes = new PESPacket(0xC0, TSTimeStamp.FromMilliseconds(pts), null, pes_payload.ToArray());
var pes_packet = new MemoryStream();
using (pes_packet) {
PESPacket.WriteTo(pes_packet, pes);
}
writer.WriteTSPackets(
AudioPID,
true,
null,
pes_packet.ToArray()
);
}
public static void WriteTo(Stream stream, ADTSHeader header)
{
using (var s = new BitWriter(stream, true)) {
s.Write(12, header.Sync);
s.Write(1, header.Id);
s.Write(2, header.Layer);
s.Write(1, header.CRCAbsent ? 1 : 0);
s.Write(2, header.Profile);
s.Write(4, header.SamplingFreqIndex);
s.Write(1, header.IsPrivate);
s.Write(3, header.ChannelConfigurtion);
s.Write(1, header.IsOriginal);
s.Write(1, header.IsHome);
s.Write(1, header.CopyrightIdBit);
s.Write(1, header.CopyrightIdStart);
s.Write(13, header.FrameLength);
s.Write(11, header.BufferFullness);
s.Write(2, header.RawDataBlocks);
if (!header.CRCAbsent)
{
s.Write(16, header.CRC);
}
}
}
