On 20/07/2019 00:19, Jarek Samic wrote:
> ---
> libavfilter/transform.c | 13 ++++++++++---
> libavfilter/transform.h | 30 +++++++++++++++++++-----------
> libavfilter/vf_deshake.c | 7 +++++--
> 3 files changed, 34 insertions(+), 16 deletions(-)
>
> diff --git a/libavfilter/transform.c b/libavfilter/transform.c
> index f92fc4d42f..f65de965cd 100644
> --- a/libavfilter/transform.c
> +++ b/libavfilter/transform.c
> @@ -103,12 +103,19 @@ INTERPOLATE_METHOD(interpolate_biquadratic)
> }
> }
>
> -void avfilter_get_matrix(float x_shift, float y_shift, float angle, float
> zoom, float *matrix) {
> - matrix[0] = zoom * cos(angle);
> +void avfilter_get_matrix(
> + float x_shift,
> + float y_shift,
> + float angle,
> + float scale_x,
> + float scale_y,
> + float *matrix
> +) {
> + matrix[0] = scale_x * cos(angle);
> matrix[1] = -sin(angle);
> matrix[2] = x_shift;
> matrix[3] = -matrix[1];
> - matrix[4] = matrix[0];
> + matrix[4] = scale_y * cos(angle);
> matrix[5] = y_shift;
> matrix[6] = 0;
> matrix[7] = 0;
> diff --git a/libavfilter/transform.h b/libavfilter/transform.h
> index 07436bfccb..0bdc9be123 100644
> --- a/libavfilter/transform.h
> +++ b/libavfilter/transform.h
> @@ -60,20 +60,28 @@ enum FillMethod {
> #define FILL_DEFAULT FILL_ORIGINAL
>
> /**
> - * Get an affine transformation matrix from a given translation, rotation,
> and
> - * zoom factor. The matrix will look like:
> + * Get an affine transformation matrix from given translation, rotation, and
> + * zoom factors. The matrix will look like:
> *
> - * [ zoom * cos(angle), -sin(angle), x_shift,
> - * sin(angle), zoom * cos(angle), y_shift,
> - * 0, 0, 1 ]
> + * [ scale_x * cos(angle), -sin(angle), x_shift,
> + * sin(angle), scale_y * cos(angle), y_shift,
> + * 0, 0, 1 ]
> *
> - * @param x_shift horizontal translation
> - * @param y_shift vertical translation
> - * @param angle rotation in radians
> - * @param zoom scale percent (1.0 = 100%)
> - * @param matrix 9-item affine transformation matrix
> + * @param x_shift horizontal translation
> + * @param y_shift vertical translation
> + * @param angle rotation in radians
> + * @param scale_x x scale percent (1.0 = 100%)
> + * @param scale_y y scale percent (1.0 = 100%)
> + * @param matrix 9-item affine transformation matrix
> */
> -void avfilter_get_matrix(float x_shift, float y_shift, float angle, float
> zoom, float *matrix);
> +void avfilter_get_matrix(
> + float x_shift,
> + float y_shift,
> + float angle,
> + float scale_x,
> + float scale_y,
> + float *matrix
> +);
Apologies for not noticing this when we talked about it earlier, but this
function is actually user-visible - it's global with an exported prefix
(<http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libavfilter/libavfilter.v;h=6518e5fc0960bc0c468e7cd3531634857fe4c68f;hb=HEAD>).
That means the API/ABI is fixed and you shouldn't be changing the signature.
You could make a new function (with ff_ prefix, I guess?), or just inline the
code in your own filter.
Thanks,
- Mark
(I'm not sure /why/ it's exported. A bit of searching doesn't find any code
which uses it other than the existing deshake filter, so maybe it doesn't need
to be part of the user API?)
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