static int load_mask(uint8_t **mask, int *w, int *h,
const char *filename, void *log_ctx)
{
int ret;
enum PixelFormat pix_fmt;
uint8_t *src_data[4], *gray_data[4];
int src_linesize[4], gray_linesize[4];
/* load image from file */
if ((ret = ff_load_image(src_data, src_linesize, w, h, &pix_fmt, filename, log_ctx)) < 0)
return ret;
/* convert the image to GRAY8 */
if ((ret = ff_scale_image(gray_data, gray_linesize, *w, *h, PIX_FMT_GRAY8,
src_data, src_linesize, *w, *h, pix_fmt,
log_ctx)) < 0)
goto end;
/* copy mask to a newly allocated array */
*mask = av_malloc(*w * *h);
if (!*mask)
ret = AVERROR(ENOMEM);
av_image_copy_plane(*mask, *w, gray_data[0], gray_linesize[0], *w, *h);
end:
av_free(src_data[0]);
av_free(gray_data[0]);
return ret;
}
int load_image_into_frame(AVFrame *frame, const char *filename)
{
int retval = -1, res;
static struct SwsContext *sws_ctx;
uint8_t *image_data[4];
int linesize[4];
int source_width, source_height;
enum PixelFormat source_fmt;
res = ff_load_image(image_data, linesize, &source_width, &source_height, &source_fmt, filename, NULL);
check(res >= 0, "failed to load image");
if (source_fmt != frame->format) {
sws_ctx = sws_getContext(source_width, source_height, source_fmt,
frame->width, frame->height, frame->format,
sws_flags, NULL, NULL, NULL);
check(sws_ctx, "unable to initialize scaling context");
sws_scale(sws_ctx,
(const uint8_t * const *)image_data, linesize,
0, frame->height, frame->data, frame->linesize);
}
retval = 0;
error:
av_freep(&image_data[0]);
sws_freeContext(sws_ctx);
return retval;
}