This is especially sad as the avcodec_send_packet (which does the decoding) returns within 5ms, which is competitive with stronger and more established decoders like NVDEC and Intel MFX. On the other hand, it fits pretty perfectly into a timeframe that is expected, as caching on Peripheral memory usually is disabled.

And yes, this is on -O3 with -mfpu=neon and -ftree-vectorize (and it does, indeed, vectorize the code - without, it's running at 150ms per frame copy). Obviously, a copy time of anything more than 3 milliseconds for a Full-HD image is atrocious for a modern CPU. Receive_frame: 0ms // avcodec_receive_frame So I did a performance measurement using Wall time:Ĭode: Select all Send_frame: 5ms // avcodec_send_packet However, sws_scale() refuses to accept the SAND128 pixel format, so I'm doing it manually for now.Īnd, Indeed, it works and I get a good image in greyscale. Using this code, I'm fully aware that I'm only copying the Y-Component and broadcasting it to the BGR32/RGB32 pixel format. 2) Disabled cache (Peripheral addresses)įor (auto x_tile = 0 x_tile (m_outbuf.get() + y * rgblinesize) + x_tile*128 ) 1) Low locality (Column-Based (SAND) vs Row-Based (OpenGL)) Sand128 Pixel format: Layed out in columns of 128xheight, with columns being linesize*128 bytes apart (for the y-plane)Ĭonst auto* y_plane = source_frame->data Ĭonst auto colpitch = source_frame->linesize Ĭonst auto colwidth = source_frame->linesize Ĭonst auto height = source_frame->height Ĭonst auto rgblinesize = m_rgb_frame->linesize However, using the Standard AV_CODEC_HEVC with the DRM accelerator seems to be working just fine using AV_PIX_FMT_RPI4_8 for both the Hardware and Software frame layouts Interestingly, using 'hevc_rpi' does not work properly, returning just 2 nameless hardware decoders (such that it is impossible to provide a hardware decoder to the Context).

I'm not sure why some decoders are present, but reporting NULL as a name (via av_hwdevice_get_type_name(x->device_type)). Code: Select all OpenGL version: 3.1 Mesa 19.3.2

Ffmpeg h265 decoder