1 files changed, 162 insertions, 0 deletions
diff --git a/gst-libs/gst/video/gstbasevideoutils.c b/gst-libs/gst/video/gstbasevideoutils.c
new file mode 100644
index 00000000..3de6038c
--- /dev/null
+++ b/gst-libs/gst/video/gstbasevideoutils.c
@@ -0,0 +1,162 @@
+/* GStreamer
+ * Copyright (C) 2008 David Schleef <ds@schleef.org>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "gstbasevideoutils.h"
+
+#include <string.h>
+
+GST_DEBUG_CATEGORY_EXTERN (basevideo_debug);
+#define GST_CAT_DEFAULT basevideo_debug
+
+
+guint64
+gst_base_video_convert_bytes_to_frames (GstVideoState * state, guint64 bytes)
+{
+  return gst_util_uint64_scale_int (bytes, 1, state->bytes_per_picture);
+}
+
+guint64
+gst_base_video_convert_frames_to_bytes (GstVideoState * state, guint64 frames)
+{
+  return frames * state->bytes_per_picture;
+}
+
+
+gboolean
+gst_base_video_rawvideo_convert (GstVideoState * state,
+    GstFormat src_format, gint64 src_value,
+    GstFormat * dest_format, gint64 * dest_value)
+{
+  gboolean res = FALSE;
+
+  if (src_format == *dest_format) {
+    *dest_value = src_value;
+    return TRUE;
+  }
+
+  if (src_format == GST_FORMAT_BYTES &&
+      *dest_format == GST_FORMAT_DEFAULT && state->bytes_per_picture != 0) {
+    /* convert bytes to frames */
+    *dest_value = gst_util_uint64_scale_int (src_value, 1,
+        state->bytes_per_picture);
+    res = TRUE;
+  } else if (src_format == GST_FORMAT_DEFAULT &&
+      *dest_format == GST_FORMAT_BYTES && state->bytes_per_picture != 0) {
+    /* convert bytes to frames */
+    *dest_value = src_value * state->bytes_per_picture;
+    res = TRUE;
+  } else if (src_format == GST_FORMAT_DEFAULT &&
+      *dest_format == GST_FORMAT_TIME && state->fps_n != 0) {
+    /* convert frames to time */
+    /* FIXME add segment time? */
+    *dest_value = gst_util_uint64_scale (src_value,
+        GST_SECOND * state->fps_d, state->fps_n);
+    res = TRUE;
+  } else if (src_format == GST_FORMAT_TIME &&
+      *dest_format == GST_FORMAT_DEFAULT && state->fps_d != 0) {
+    /* convert time to frames */
+    /* FIXME subtract segment time? */
+    *dest_value = gst_util_uint64_scale (src_value, state->fps_n,
+        GST_SECOND * state->fps_d);
+    res = TRUE;
+  }
+
+  /* FIXME add bytes <--> time */
+
+  return res;
+}
+
+gboolean
+gst_base_video_encoded_video_convert (GstVideoState * state,
+    GstFormat src_format, gint64 src_value,
+    GstFormat * dest_format, gint64 * dest_value)
+{
+  gboolean res = FALSE;
+
+  if (src_format == *dest_format) {
+    *dest_value = src_value;
+    return TRUE;
+  }
+
+  GST_DEBUG ("src convert");
+
+#if 0
+  if (src_format == GST_FORMAT_DEFAULT && *dest_format == GST_FORMAT_TIME) {
+    if (dec->fps_d != 0) {
+      *dest_value = gst_util_uint64_scale (granulepos_to_frame (src_value),
+          dec->fps_d * GST_SECOND, dec->fps_n);
+      res = TRUE;
+    } else {
+      res = FALSE;
+    }
+  } else {
+    GST_WARNING ("unhandled conversion from %d to %d", src_format,
+        *dest_format);
+    res = FALSE;
+  }
+#endif
+
+  return res;
+}
+
+gboolean
+gst_base_video_state_from_caps (GstVideoState * state, GstCaps * caps)
+{
+
+  gst_video_format_parse_caps (caps, &state->format,
+      &state->width, &state->height);
+
+  gst_video_parse_caps_framerate (caps, &state->fps_n, &state->fps_d);
+
+  state->par_n = 1;
+  state->par_d = 1;
+  gst_video_parse_caps_pixel_aspect_ratio (caps, &state->par_n, &state->par_d);
+
+  {
+    GstStructure *structure = gst_caps_get_structure (caps, 0);
+    state->interlaced = FALSE;
+    gst_structure_get_boolean (structure, "interlaced", &state->interlaced);
+  }
+
+  state->clean_width = state->width;
+  state->clean_height = state->height;
+  state->clean_offset_left = 0;
+  state->clean_offset_top = 0;
+
+  /* FIXME need better error handling */
+  return TRUE;
+}
+
+GstClockTime
+gst_video_state_get_timestamp (const GstVideoState * state, int frame_number)
+{
+  if (frame_number < 0) {
+    return state->segment.start -
+        (gint64) gst_util_uint64_scale (-frame_number,
+        state->fps_d * GST_SECOND, state->fps_n);
+  } else {
+    return state->segment.start +
+        gst_util_uint64_scale (frame_number,
+        state->fps_d * GST_SECOND, state->fps_n);
+  }
+}