Thomas Seilund wrote:
Dear all,
I have a filled out AVFrame and an image buffer.
The AVFrame holds a video frame, yuv420p, 720x576.
The image buffer is an RGB24, 88x90.
I want to substitute the upper left corner of the AVFrame with the
content of the image buffer.
I have the following code where picture is my AVFrame and image_blob
is my image buffer. Basically I put every third byte of the image
buffer into AVFrame->data[0].
offsetSB = 0;
pipw = 88;
piph = 90;
for (line = 0; line < 1; line++)
{
for (hTPS = 0; hTPS < piph; hTPS++) {
for (wTPS = 0; wTPS < pipw; wTPS++) {
picture->data[line][hTPS * picture->linesize[line] +
wTPS] =
*(image_blob + 3*offsetSB++);
}
}
}
This works fine but I only get a black and white image buffer in the
upper left part of the AVFrame.
I simply don't know how to get the colors of the image buffer into the
AFFrame as well.
Any help would be very much appreciated.
Thanks
Thomas S
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Hi all
SOLVED.
1. I use an ImageMagick function to convert image buffer from RGB24 to YUV
2. I set up a new AVFrame that holds my image buffer using function
avpicture_fill() - new frame is pFrameRGB
3. Then I change the loop this way:
offsetSB = 0;
int line;
for (line = 0; line < 4; line++)
{
for (hTPS = 0; hTPS < piph / (line ? 2 : 1); hTPS++) {
for (wTPS = 0; wTPS < pFrameRGB->linesize[line]; wTPS++) {
picture->data[line][(hTPS + fromTop) *
picture->linesize[line] + wTPS + fromLeft] =
pFrameRGB->data[line][hTPS *
pFrameRGB->linesize[line] + wTPS];
}
}
}
I have added a few variables, fromTop and fromLeft.The intention is that
I should be able to move the inserted image buffer around in the larger
AVFrame.
Thanks
Thomas S
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libav-user mailing list
[email protected]
https://lists.mplayerhq.hu/mailman/listinfo/libav-user
