[gst-devel] sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.

[Ajitabh Saxena]

Hi There,
        Thanks for the information. I figured that it should be correct only. Now from the VC1 specs it says that  there is a 4 byte sequence strucutre (STRUCT_C) for simple and main profile. The fiels included are:

PROFILE: 4bits
FRMRTQ:3 bits
BITRTQ_POST:5bits
LOOPFILTER:1
Res-3:1
MULTIRES:1
Res-4:1
FASTUVMC:1
EXTENDED_MV:1
DQUANT:
:
:
:
Res6:1

Though the total of this structure comes to 4 bytes. But when I see the metadata for simple/Main
0x4B 0xF1 0x0A 0x01

The first two bits which designate the profile are set to Advanced profile.
>From Specs it says that these bits are designated to be 

Value    -  Meaning.
==============================
    0    - Simple Profile.
    4    - Main Profile.
    12   - Advanced Profile.


Just also want to mention that for advanced profile the Metadata makes perfect sence and the data that I am getting is 

27 00 00 01 0f DB BE 27 F1 67 88 80 00 00 01 0E 10 44 9F C5 9C 80

Am I parsing the structure correctly. I know I am missing something. 
Please Help.
-- AJ.

-----Original Message-----
From: Felipe Contreras [mailto:felipe.contreras at gmail.com] 
Sent: Monday, October 20, 2008 9:48 AM
To: Discussion of the development of GStreamer
Subject: Re: [gst-devel] sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.

On Sat, Oct 18, 2008 at 12:32 AM, Ajitabh Saxena <ajitabhp at broadcom.com> wrote:
> Hi All,
>            We have written a gstreamer plugin and it announces itself as a
> decoder. Since my decoder will reject anything without the sequence header.
> I am trying to the get the sequence header from a WMV AP file but not able
> to get it. I am using totem to test my plugin.
>
> In my sink_set_caps function:
> value=gst_structure_get_value(XX,"codec_data");
> buff = get_value_get_buffer(value);
> xyz = GST_BUFFER_DATA(buff);
> size = GST_BUFFER_SIZE(buff);
>
>
> I am able to get the sequence header for Advanced profile but for simple
> main it gives me only 4 bytes.

4 bytes of codec data is correct for main and simple profile.

-- 
Felipe Contreras

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