Implement av_image_alloc() and use it in

avfilter_default_get_video_buffer().

Originally committed as revision 25878 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 29 insertions, 0 deletions

diff --git a/libavcore/imgutils.c b/libavcore/imgutils.c
index cf7909342d..0f449ff427 100644
--- a/libavcore/imgutils.c
+++ b/libavcore/imgutils.c
@@ -172,6 +172,35 @@ int ff_set_systematic_pal2(uint32_t pal[256], enum PixelFormat pix_fmt)
     return 0;
 }
 
+int av_image_alloc(uint8_t *pointers[4], int linesizes[4],
+                   int w, int h, enum PixelFormat pix_fmt, int align)
+{
+    int i, ret;
+    uint8_t *buf;
+
+    if ((ret = av_image_check_size(w, h, 0, NULL)) < 0)
+        return ret;
+    if ((ret = av_image_fill_linesizes(linesizes, pix_fmt, w)) < 0)
+        return ret;
+
+    for (i = 0; i < 4; i++)
+        linesizes[i] = FFALIGN(linesizes[i], align);
+
+    if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, NULL, linesizes)) < 0)
+        return ret;
+    buf = av_malloc(ret + align);
+    if (!buf)
+        return AVERROR(ENOMEM);
+    if ((ret = av_image_fill_pointers(pointers, pix_fmt, h, buf, linesizes)) < 0) {
+        av_free(buf);
+        return ret;
+    }
+    if (av_pix_fmt_descriptors[pix_fmt].flags & PIX_FMT_PAL)
+        ff_set_systematic_pal2((uint32_t*)pointers[1], pix_fmt);
+
+    return ret;
+}
+
 typedef struct ImgUtils {
     const AVClass *class;
     int   log_offset;