[FFmpeg-soc] [PATCH]aacsbr: bs_amp_res is overridden by 0 for (bs_frame_class == FIXFIX && bs_num_env == 1) only for the current frame

[Robert Swain]

On Thu, 2009-11-19 at 19:19 -0500, Alex Converse wrote:
> So this is kind of ambiguous in the spec... bs_amp_res is read in the
> SBR header. If (bs_frame_class == FIXFIX && bs_num_env == 1)
> bs_amp_res is set to zero. Those are both per frame variables and I'm
> pretty sure the affect only lasts for one frame. That's how the refdec
> seems to behave anyway.
> 
> 4.B.18.6 Data quantization
> The spectral envelope scalefactors are quantized in 3dB steps or in
> 1.5dB steps, dependent on the time frequency resolution of the current
> SBR frame, and bs_amp_res. For the case where there is only one SBR
> envelope per SBR frame and of SBR frame class FIXFIX, 1.5 dB steps are
> always used, disregarded the value of bs_amp_res.

Mmm, I see. Looks OK.

Regards,
Rob