Some decoders need mp4's maximum sample size
Submitted by alf..@..al.com
Created attachment 297396
Patch for qtdemux.c
HW decoders re-use input buffers and in some cases the size they use is too small because they try to minimize the (physical)memory resources employed when decoding. Therefore, some times it is needed to give them a good estimate of the maximum sample size to avoid decoding errors that happen when the input buffer size is smaller than the size of a sample.
The size is determined using the sample size field in stsz atom if set or searching the maximum sample size in the sample size table field (stsz too) otherwise. This is similar to what is done in the AOSP project:
(See http://goo.gl/sp3S8V for information on the mp4 stsz atom.)
We are using "max-input-size" cap in out androidmedia/hybris decoder
as we found some videos produce artefacts for some HW decoders in mobile SoCs.
Patch 297396, "Patch for qtdemux.c":