[FFmpeg-devel] avcodec/hapqa_extract_bsf : add bsf filter for haqqa (to hapq or hapalpha only) conversion

[Tom Butterworth]

Hi Martin

From 0002-avcodec-hapqa_extract_bsf-add-new-bsf-filter:

> if (ctx->texture == 1) {
> ...

The ordering of sections in a Hap frame is not specified, so you can’t assume the first is the colour and the second alpha - you will have to query the section types for both sections and choose the appropriate one.

> bytestream2_seek(&gbc, start_section_size, SEEK_SET);//On va au debut de la texture 1

Comments in English are more helpful for those like me with terrible French.

>  { "texture", "texture to keep", OFFSET(texture), AV_OPT_TYPE_INT, {.i64 = 0 }, 0, 1, },

Could there be named options to follow this (eg, “color”, “alpha”)?

Cheers - Tom

On 18 Feb 2018, 19:05 +0000, Martin Vignali <martin.vignali at gmail.com>, wrote:
> Hello,
>
> Like no comment have been made for the WIP version (November 2017),
> ready to apply patchs in attach
> pass fate on osx (x86_64)
>
>
> Update :
> - Add doc for new bsf filter
>
> The goal is to convert HAPQA file to HAPQ (removing alpha)
> or HAPAlphaOnly (remove rgb)
>
> HAPQA data, is separate in two part, one for RGB data and one for alpha data
> so we can make the conversion without losses, by copying the right part.
>
>
> Martin
>
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