[FFmpeg-devel] [PATCH v4 0/1] lavfi/vf_gopromax_opencl: add GoPor Max 360 video filter

[TADANO Tokumei]

ping again

On 2024/08/15 17:10, TADANO Tokumei wrote:
> ping
> 
> On 2024/08/03 9:56, TADANO Tokumei wrote:
>> This is updated patch of:
>> https://patchwork.ffmpeg.org/project/ffmpeg/list/?series=3943
>> I contacted to Ronan LE MEILLAT and agreed with him to submit new patch.
>>
>> Abstruct of GoPro Max .360 video file format is described in:
>> https://gopro.com/news/max-tech-specs-stitching-resolution
>>
>> The specification is little bit buggy.
>> The format is based on EAC (Equi-Angular Cubemap), and there are overlapped
>> pixels at boundaries of front and rear cams.
>> Probably, the desinger intended to add 2 x 32 (= total 64) ovelapped pixels.
>> But actual format has 2 x 64 pixels overlapped area.
>> Thus the width will be 2 x 32 pixels shorter than standard EAC format after
>> blending overlapped area.
>>
>> This filter blends overlapped area, stretches the width of the cube,
>> and combine two streams into single stream with standard format.
>>
>> v3: modifies `configure` file to add dependency on opencl.
>> v4: fix small difference from v360 filter in xyz_to_eac()
> 
> The filter is not generic filter but for specific device.
> If there is no bad influence to other filters and/or codecs, please apply this patch.
> 
> Sample .360 files of GoPro Max can be found at:
> https://bit.ly/x3vsmax
> https://drive.google.com/drive/folders/1h-ks7-jxV6uRE_pcrKMGsaIiPRjJ0eW
> 
> Thanks,
> 
>> TADANO Tokumei (1):
>>    lavfi/vf_gopromax_opencl: add GoPro Max 360 video filter
>>
>>   configure                        |   1 +
>>   doc/filters.texi                 |  78 +++++++
>>   libavfilter/Makefile             |   2 +
>>   libavfilter/allfilters.c         |   1 +
>>   libavfilter/opencl/gopromax.cl   | 282 +++++++++++++++++++++++++
>>   libavfilter/opencl_source.h      |   1 +
>>   libavfilter/vf_gopromax_opencl.c | 351 +++++++++++++++++++++++++++++++
>>   7 files changed, 716 insertions(+)
>>   create mode 100644 libavfilter/opencl/gopromax.cl
>>   create mode 100644 libavfilter/vf_gopromax_opencl.c
>>
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