[FFmpeg-devel] AAC decoder round 6

[madshi]

Robert Swain schrieb:
> 2008/8/9 madshi <dear at madshi.net>:
>   
>> Robert Swain schrieb:
>>     
>>> $subj
>>>
>>> Regards,
>>> Rob
>>>
>>>       
>>  > ac->m4ac.sampling_index = get_bits(gb, 4);
>>  > if(ac->m4ac.sampling_index > 12) {
>>  >   av_log(ac->avccontext, AV_LOG_ERROR, "invalid sampling rate index
>> %d\n", ac->m4ac.sampling_index);
>>  >   return -1;
>>  > }
>>  > ac->m4ac.sample_rate =
>> ff_mpeg4audio_sample_rates[ac->m4ac.sampling_index];
>>
>> The valid sampling rate indexes are from 0..11.
>> So shouldn't it be "if(ac->m4ac.sampling_index > 11)"?
>>     
>
> It seems it should be, yes. Sample rates down to 8kHz are supported as
> far as I can tell and index 12 is 7350Hz.
>
> Rob
>   

I don't find 7350Hz in ISO/IEC 13818-7. It goes down to 8000Hz
in that document, only. Where is 7350Hz coming from? Is that
part of the AAC update in ISO/IEC 14496-3? I couldn't find any
(free) way to get access to that document, unfortunately...

Thanks!

Regards, madshi.