Add a utility function to check whether an H.264 level can be used given the current encoding parameters.

git-svn-id: svn://svn.handbrake.fr/HandBrake/trunk@5044 b64f7644-9d1e-0410-96f1-a4d463321fa5

2 files changed, 30 insertions, 0 deletions

diff --git a/libhb/encx264.c b/libhb/encx264.c
index 49e99973a..2da886a68 100644
--- a/libhb/encx264.c
+++ b/libhb/encx264.c
@@ -627,6 +627,21 @@ int encx264Work( hb_work_object_t * w, hb_buffer_t ** buf_in,
     return HB_WORK_OK;
 }
 
+int hb_check_h264_level(const char *h264_level, int width, int height,
+                        int fps_num, int fps_den, int interlaced,
+                        int fake_interlaced)
+{
+    x264_param_t param;
+    x264_param_default(&param);
+    param.i_width           = width;
+    param.i_height          = height;
+    param.i_fps_num         = fps_num;
+    param.i_fps_den         = fps_den;
+    param.b_interlaced      = !!interlaced;
+    param.b_fake_interlaced = !!fake_interlaced;
+    return (hb_apply_h264_level(&param, h264_level, NULL, 1) != 0);
+}
+
 int hb_apply_h264_level(x264_param_t *param, const char *h264_level,
                         const char *x264_profile, int be_quiet)
 {
diff --git a/libhb/encx264.h b/libhb/encx264.h
index 56b0163e9..a9c9dac97 100644
--- a/libhb/encx264.h
+++ b/libhb/encx264.h
@@ -41,6 +41,21 @@ static const char * const hb_x264_encopt_synonyms[][2] =
 };
 
 /*
+ * Check whether a valid h264_level is compatible with the given framerate,
+ * resolution and interlaced compression/flags combination.
+ *
+ * width, height, fps_num and fps_den should be greater than zero.
+ *
+ * interlacing parameters can be set to zero when the information is
+ * unavailable, as hb_apply_h264_level() will disable interlacing if necessary.
+ *
+ * Returns 0 if the level is valid and compatible, 1 otherwise.
+ */
+int hb_check_h264_level(const char *h264_level, int width, int height,
+                        int fps_num, int fps_den, int interlaced,
+                        int fake_interlaced);
+
+/*
  * Applies the restrictions of the requested H.264 level to an x264_param_t.
  *
  * Returns -1 if an invalid level (or no level) is specified. GUIs should be