[Ffmpeg-devel] [PATCH] DVB AC-3 support in mpegts.c

[Nico Sabbi]

Wolfram Gloger wrote:
>> Nico Sabbi wrote:
>>
>>     
>>> Andy Brown wrote:
>>>
>>>       
>>>> This patch simply adds demuxing support for AC-3 streams in DVB TS 
>>>> files.  In
>>>> these streams AC-3 is given type 0x06 (private stream) and includes a
>>>> descriptor with either tag 0x6A or 0x7A.  The code already handles 
>>>> ATSC AC-3
>>>>         
> ...
>   
>>> I knew of 0x6a, but where is 0x71 defined? I don't remember I ever 
>>> read it in
>>> recent specifications published by ETSI
>>>
>>>       
>> sorry, I meant 0x7a, not 0x71
>>     
>
> Googling quickly gave:
>
> http://webapp.etsi.org/action/OP/OP20060428/en_300468v010701o.pdf
>   

december 2005, quite new indeed. Thanks!
> and that lists 0x7a as "enhanced AC-3 descriptor".
>
> Could we as a first step please add the currently hardcoded values to
> mpegts.h, such as in the following patch?
>
> Regards,
> Wolfram.
>
> --- ffmpeg/libavformat/mpegts.h	Mon Jan 16 10:00:09 2006
> +++ ffmpeg-wg/libavformat/mpegts.h	Wed Mar 15 11:21:25 2006
> @@ -33,7 +33,11 @@
>  #define SDT_TID   0x42
>  
>  /* descriptor ids */
> +#define DVB_LANGUAGE_DESCID         0x0a
> +#define DVB_TELETEXT_DESCID         0x56
>  #define DVB_SUBT_DESCID             0x59
> +#define DVB_AC3_DESCID              0x6a
> +#define DVB_ENHANCED_AC3_DESCID     0x7a
>  
>  #define STREAM_TYPE_VIDEO_MPEG1     0x01
>  #define STREAM_TYPE_VIDEO_MPEG2     0x02
> @@ -49,6 +53,7 @@
>  #define STREAM_TYPE_AUDIO_DTS       0x8a
>  
>  #define STREAM_TYPE_SUBTITLE_DVB    0x100
> +#define STREAM_TYPE_TELETEXT        0x101
>  
>  unsigned int mpegts_crc32(const uint8_t *data, int len);
>  extern AVOutputFormat mpegts_mux;
> l
>
>   

there are also: 0x7B for  DTS and 0x7C for AAC

 
 
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