sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.
Locked
sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.
 
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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.
--
Thanks,
--
AJ
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Re: sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.
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On Sat, Oct 18, 2008 at 12:32 AM, Ajitabh Saxena <[hidden email]> 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 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.
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|
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:[hidden email]] 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 <[hidden email]> 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 ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
Re: sequence header from "codec_data" for WMV VC-1 Advanced and Simple Main profiles.
|
|
On Tue, Oct 21, 2008 at 4:29 AM, Ajitabh Saxena <[hidden email]> wrote:
> 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. I don't know how to parse the data, maybe you can take a look at FFmpeg. -- Felipe Contreras ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ gstreamer-devel mailing list [hidden email] https://lists.sourceforge.net/lists/listinfo/gstreamer-devel |
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