[FFmpeg-user] Get Hardware Buffer from FFmpeg 4.0 + VideoToolBox

[f***@me.com]

I recently did just this. frame->data[3] holds a CVPixelBufferRef. Here is some sample code in Swift:

let pixelBuffer =
Unmanaged<CVPixelBuffer>.fromOpaque(frame!.pointee.data.3!)
.retain()
.takeRetainedValue()

In C, you would do something like:

CVPixelBufferRef pixelBuffer = CVPixelBufferRetain((CVPixelBufferRef)frame->data[3]);

Cheers!
fumoboy007

On Sat Aug 18 05:50:45 EEST 2018, Bo Zhou <***@gmail.com> wrote:
Hi !

I'm using the FFmpeg 4.0.2 and successfully executed the example hw_decode
on Mac. And I could see the trace log


[h264 @ 0x7f97d9800000] Format videotoolbox_vld chosen by get_format().
[h264 @ 0x7f97d9800000] Format videotoolbox_vld requires hwaccel
initialisation.
[h264 @ 0x7f97d9800000] Reinit context to 1280x720, pix_fmt:
videotoolbox_vld


Which should mean that it's using videotoolbox_vld .

In the hw_decode.c file, we could find the following piece of code.

if (frame->format == hw_pix_fmt) {
/* retrieve data from GPU to CPU */
if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) {
fprintf(stderr, "Error transferring the data to system
memory\n");
goto fail;
}
tmp_frame = sw_frame;
} else
tmp_frame = frame;

So I'd like to know is that possible to get the GPU buffer directly ? I
could see the frame->data[3] and frame->buf[0] has a pointer, but how
should I use them ? I just want to map the hardware buffer into OpenGL
directly.

Thank you very much.
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[Bo Zhou]

Thank you so much ! I'd like to have a try !

Post by f***@me.com
I recently did just this. frame->data[3] holds a CVPixelBufferRef. Here is
let pixelBuffer =
Unmanaged<CVPixelBuffer>.fromOpaque(frame!.pointee.data.3!)
.retain()
.takeRetainedValue()
CVPixelBufferRef pixelBuffer =
CVPixelBufferRetain((CVPixelBufferRef)frame->data[3]);
Cheers!
fumoboy007
Hi !
I'm using the FFmpeg 4.0.2 and successfully executed the example hw_decode
on Mac. And I could see the trace log
initialisation.
videotoolbox_vld
Which should mean that it's using videotoolbox_vld .
In the hw_decode.c file, we could find the following piece of code.
if (frame->format == hw_pix_fmt) {
/* retrieve data from GPU to CPU */
if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) {
fprintf(stderr, "Error transferring the data to system
memory\n");
goto fail;
}
tmp_frame = sw_frame;
} else
tmp_frame = frame;
So I'd like to know is that possible to get the GPU buffer directly ? I
could see the frame->data[3] and frame->buf[0] has a pointer, but how
should I use them ? I just want to map the hardware buffer into OpenGL
directly.
Thank you very much.

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ffmpeg-***@ffmpeg.org
http://ffmpeg.org/mailman/listinfo/ffmpeg-user

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ffmpeg-u