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Code Issues Releases Wiki Activity

remove index flag

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max_short_distance
reserved_v -> reserved_count
header repeation rules

some of this is from rich


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@12502 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2004-05-25 20:42:22 +00:00
parent 082a233476
commit 8d4d64c985
1 changed files with 33 additions and 8 deletions
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41
DOCS/tech/mpcf.txt
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@ -89,6 +89,7 @@ main header:
version v
stream_count v
max_distance v
max_short_distance v
global_time_base_nom v
global_time_base_denom v
short_startcode v
@ -113,7 +114,7 @@ main header:
data_size_mul[i]= tmp_mul;
data_size_lsb[i]= tmp_size + j;
timestamp_delta[i]= tmp_timestamp;
reserved_v[i]= tmp_res;
reserved_count[i]= tmp_res;
}
}
reserved_bytes
@ -132,7 +133,6 @@ stream_header:
msb_timestamp_shift v
decode_delay v
fixed_fps u(1)
index_flag u(1)
reserved u(6)
for(;;){
codec_specific_data_type v
@ -170,14 +170,13 @@ frame
if(flags[frame_code]&1){
data_size_msb v
}
for(i=0; i<reserved_v[frame_code]; i++)
for(i=0; i<reserved_count[frame_code]; i++)
reserved v
data
Index:
index_startcode f(64)
packet header
stream_id v
index_length v
for(i=0; i<index_length; i++){
index_timestamp v
@ -267,13 +266,25 @@ max_distance
there is only a single frame between the 2 frame_startcodes
this can be used by the demuxer to detect damaged frame headers if the
damage results in a too long chain
SHOULD be set to <=16384 to ensure reasonable error recovery
SHOULD be set to <=32768 or at least <=65536 unless there is a very good
reason to set it higher otherwise reasonable error recovery will be
impossible
max_short_distance
max distance of short startcodes or frame_startcodes, the distance may
only be larger if there is only a single frame between the 2
frame_startcodes/short startcodes this can be used by the demuxer to
detect damaged frame headers if the damage results in a too long chain
SHOULD be set to <=4096 or at least <=8192 unless there is a very good
reason to set it higher otherwise reasonable error recovery will be
impossible
short_startcode
MUST be 3 bytes long and MUST have 'N' as first byte, the second byte
MUST not be a printable uppercase letter / must not be within 65..90,
default is 0x4EFE79
stream_id
Note: streams with a lower relative class MUST have a lower relative id
so a stream with class 0 MUST allways have a id which is lower then any
@ -539,11 +550,18 @@ stream_header (id=n)
headers may be repated, but if they are then they MUST all be repeated together
and repeated headers MUST be identical
headers MAY only repeated at the closest possible positions after 2^x where x is
an integer and the file end, so the headers may be repeated at 4102 if thats the
closest possition after 2^12=4096 at which the headers can be placed
headers MUST be repeated every 10sec at least ? FIXME
headers MUST be repeated BEFORE keyframes
headers MUST be placed at least at the begin of the file and immedeatly before
the index or at the file end if there is no index
headers MUST be repeated at least twice (so they exist 3 times in a file)
a demuxer MUST not demux a stream which contains more than one stream, or which
is wrapped in a structure to facilitate more than one stream or otherwise
duplicate the role of a container. any such file is to be considered invalid
Index
the index can be repeated but there SHOULD be at least one for each stream at
the end
@ -561,6 +579,13 @@ for example, the current song title & artist of the currently shown music video
Unknown packets
MUST be ignored by the demuxer
demuxer (non-normative)
in the absence of valid header at beginning, players SHOULD search for backup
headers starting at offset 2^x for each x players SHOULD end their search from a
particular offset when any startcode is found (including syncpoint)
Sample code (GPL, & untested)
typedef BufferContext{