[FFmpeg-devel] [PATCH 2/3] mpegvideo_parser: parse the output picture number

Jan Ekström jeebjp at gmail.com
Sun Feb 11 20:31:40 EET 2018

On Sun, Feb 11, 2018 at 7:52 PM, Michael Niedermayer
<michael at niedermayer.cc> wrote:
> should be ok unless its intended to also restore the MSB

The value seemed to be 10bit and if the pointer is at the position
right after the picture_start_code, then `buf[0] << 2` would move the
8 bits left of data two bits leftwards, and `buf[1] >> 6` would then
move the topmost bits of the following byte to be the bottom-most

Unless you mean that there's a forgotten `(uint16_t)` there as the end
value has 10 bits of effective data, making the correct way of doing
it something a la `(((uint16_t)buf[0]) << 2) | (((uint16_t)buf[1]) >>

> Theres no code using output_picture_number currently

Seems like some API users utilize this value.


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