[MPlayer-dev-eng] Is it possible to decode T-DMB stream withMPlayer?
Nico Sabbi
nsabbi at email.it
Tue Nov 14 18:12:27 CET 2006
madhav kulkarni wrote:
> Hello Nico,
>
> This is the sequence given in ETSI document to decode DMB stream.
>
> 1. From an MPEG-2 TS, the PAT is obtained from the TS packets with
> PID 0x0000. Then a program number and the corresponding PMT PID are
> identified. In this case, there exists only one PMT in the PAT.
>
> 2. Search for the PMT in the TS using the PMT PID obtained above.
>
>
> 3. Within the PMT, find the IOD_descriptor that includes the IOD.
>
> 4. Within the IOD, find the ES_Descriptors related to the scene
> description and object description.
>
>
> 5. From the ES_Descriptor information found in 3, obtain the ES_IDs
> and then search for the elementary stream information corresponding to
> the ES_IDs through the descriptor loop in the PMT.
>
> 6. From the elementary stream information found in 4, obtain the
> PID and stream_type pairs corresponding to the ES_Ids, respectively,
> and then find packets corresponding to each of these in the transport
> stream.
>
>
> 7. By using the ObjectDescriptorID contained in the scene
> description information, obtain the corresponding ObjectDescriptor
> contained in the object descriptor stream. By using the relationship
> between the ES_ID contained in the ObjectDescriptor and the PID that
> can be found in a way similar to 5, compose the scene.
>
> 8. Obtain the animation data using the scene description information.
>
>
> I couldn't get after decoding PMT how the ES is extracted?
libmpdemux/demux_ts.c is the right place to have answers; at the moment
I don't even
remember all the details because a lot of time has passed since I wrote it.
Anyway, I remember that the real entry point is the set of program
descriptors in the pmt,
even before the descriptors in the es loop. In it you will fine the
IOD_descriptor
that permits to recover
ObjectDescriptor->ES_descriptors->Decoderdescriptor->
DecoderSpecificDescriptor and SLConfigdescriptor, more or less in this
order.
The method you posted is really the only possible way to decode dmb streams
>
> Madhav
I told you that dmb is completely braindead! :(
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