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ffmpeg: take into account image flipping in the display matrix

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This covers only standard rotations.
Fixes part of ticket #6945.

Signed-off-by: James Almer <jamrial@gmail.com>
This commit is contained in:
James Almer 2021-09-08 15:34:26 -03:00
parent 535a835e51
commit 42fce6fffe
1 changed files with 22 additions and 4 deletions
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26
fftools/ffmpeg_filter.c
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@ -765,18 +765,36 @@ static int configure_input_video_filter(FilterGraph *fg, InputFilter *ifilter,
theta = get_rotation(displaymatrix);
if (fabs(theta - 90) < 1.0) {
if (displaymatrix[3] > 0) {
ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
if (ret < 0)
return ret;
}
ret = insert_filter(&last_filter, &pad_idx, "transpose", "clock");
} else if (fabs(theta - 180) < 1.0) {
ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
if (ret < 0)
return ret;
ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
if (displaymatrix[0] < 0) {
ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
if (ret < 0)
return ret;
}
if (displaymatrix[4] < 0) {
ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
}
} else if (fabs(theta - 270) < 1.0) {
if (displaymatrix[3] < 0) {
ret = insert_filter(&last_filter, &pad_idx, "hflip", NULL);
if (ret < 0)
return ret;
}
ret = insert_filter(&last_filter, &pad_idx, "transpose", "cclock");
} else if (fabs(theta) > 1.0) {
char rotate_buf[64];
snprintf(rotate_buf, sizeof(rotate_buf), "%f*PI/180", theta);
ret = insert_filter(&last_filter, &pad_idx, "rotate", rotate_buf);
} else if (fabs(theta) < 1.0) {
if (displaymatrix && displaymatrix[4] < 0) {
ret = insert_filter(&last_filter, &pad_idx, "vflip", NULL);
}
}
if (ret < 0)
return ret;