public SpeexHeader speex_packet_to_header(byte[] packet, int size)
{
int i;
SpeexHeader le_header;
const char* h = "Speex ";
for (i = 0; i < 8; i++)
if (packet[i] != h[i])
{
speex.notify("This doesn't look like a Speex file");
return null;
}
/*FIXME: Do we allow larger headers?*/
if (size < (int)Marshal.SizeOf(SpeexHeader))
{
speex.notify("Speex header too small");
return null;
}
le_header = new SpeexHeader();
speex.SPEEX_COPY(le_header, (SpeexHeader)packet, 1);
/*Make sure everything is converted correctly from little-endian*/
ENDIAN_SWITCH(le_header.speex_version_id);
ENDIAN_SWITCH(le_header.header_size);
ENDIAN_SWITCH(le_header.rate);
ENDIAN_SWITCH(le_header.mode);
ENDIAN_SWITCH(le_header.mode_bitstream_version);
ENDIAN_SWITCH(le_header.nb_channels);
ENDIAN_SWITCH(le_header.bitrate);
ENDIAN_SWITCH(le_header.frame_size);
ENDIAN_SWITCH(le_header.vbr);
ENDIAN_SWITCH(le_header.frames_per_packet);
ENDIAN_SWITCH(le_header.extra_headers);
if (le_header.mode >= SPEEX_NB_MODES || le_header.mode < 0)
{
speex.notify("Invalid mode specified in Speex header");
//speex_free (le_header);
return null;
}
if (le_header.nb_channels > 2)
le_header.nb_channels = 2;
if (le_header.nb_channels < 1)
le_header.nb_channels = 1;
return le_header;
}
public SpeexHeader(SpeexHeader header)
{
}
public byte[] speex_header_to_packet(SpeexHeader header, out int size)
{
SpeexHeader le_header = new SpeexHeader(header);
speex.SPEEX_COPY(le_header, header, 1);
/*Make sure everything is now little-endian*/
ENDIAN_SWITCH(le_header.speex_version_id);
ENDIAN_SWITCH(le_header.header_size);
ENDIAN_SWITCH(le_header.rate);
ENDIAN_SWITCH(le_header.mode);
ENDIAN_SWITCH(le_header.mode_bitstream_version);
ENDIAN_SWITCH(le_header.nb_channels);
ENDIAN_SWITCH(le_header.bitrate);
ENDIAN_SWITCH(le_header.frame_size);
ENDIAN_SWITCH(le_header.vbr);
ENDIAN_SWITCH(le_header.frames_per_packet);
ENDIAN_SWITCH(le_header.extra_headers);
size = Marshal.SizeOf(SpeexHeader);
return (byte[])le_header;
}
