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variable subpacket size support

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9421 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2003-02-14 11:11:11 +00:00
parent 65a739eb76
commit 7efba7825e
1 changed files with 45 additions and 11 deletions
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56
DOCS/tech/mpcf.txt
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@ -113,11 +113,9 @@ audio_stream_header:
stream_header
samplerate v
channel_count v
sub_packet_size v
shuffle_type v
reserved_bytes
checksum u(32)
frame
packet header
if(keyframe){
@ -127,13 +125,27 @@ frame
priority u(2)
checksum_flag u(1)
msb_timestamp_flag u(1)
reserved u(3)
subpacket_type u(2)
reserved u(1)
lsb_timestamp v
stream_id v
if(msb_timestamp_flag)
msb_timestamp v
bitstream
if(checksum_flag)
if(sub_packet_type==00)
sub_packet[0]
else{
subpacket_base_size v
subpacket_count v
shuffle_type v
if(subpacket_type==10){
for(i=0; i<subpacket_count; i++)
subpacket_size_diff[i] v
}
for(i=0; i<subpacket_count; i++)
subpacket[i]
}
}
if(checksum_flag)
frame_checksum u(32)
Index:
@ -271,6 +283,32 @@ msb_timestamp_flag
indicates that the msb_timestamp is coded
MUST be 1 for keyframes
subpacket_type
00 1 subpacket per packet (normally used for video)
01 subpacket_count fixed length subpackets per packet
10 subpacket_count variable length subpackets per packet
11 reserved
Note, if there are multiple subpackets then the timestamp of the packet
is the timestamp of the first subpacket
Note, if multiple subpackets are stored in one frame then the resulting
framesize SHOULD be < 16kbyte and not more then 0.5 sec of data SHOULD
be put in a single packet
subpacket_base_size
the size of the subpackets for fixed fize subpackets
an offset which should be added to the subpacket_size_diff of each
subpacket to get the actual size, so its normally the size of the
smallest subpacket
subpacket_count
the number of subpackets, if not pressent then 1
subpacket_size_diff
the (allways positive) difference from the subpacket_base_size to the
actual size of the current subpacket, if its not coded
(subpacket_type != 10) then its 0
Note a subpacket MUST be in exactly one packet, it cannot be split
msb_timestamp
most significant bits of the timestamp, SHOULD be 0 for the first frame
@ -310,12 +348,8 @@ priority
if 0 then the frame isnt used as reference (b frame) and can be droped
MUST be > 0 for keyframes
sub_packet_size
size of an audio packet
Note a subpacket MUST be in exactly one packet, it cannot be split
shuffle_type
audio is often encoded in small fixed size packets, and to increase the
audio is often encoded in small subpackets, and to increase the
error robustness these can be shuffled
0 -> no shuffle
1-16 -> interleave packets by 2^n