revised palette API, courtesy of Roberto Togni (rtogni at freemail.it)

[ffmpeg.git] / libavcodec / avcodec.h

diff --git a/libavcodec/avcodec.h b/libavcodec/avcodec.h
index ad3eb54..90b20f4 100644 (file)
--- a/libavcodec/avcodec.h
+++ b/libavcodec/avcodec.h
@@ -453,7 +453,13 @@ typedef struct AVPanScan{
      * - decoding: set by lavc\
      */\
     AVPanScan *pan_scan;\
-    
+    \
+    /**\
+     * tell user application that palette has changed from previous frame.\
+     * - encoding: ??? (no palette-enabled encoder yet)\
+     * - decoding: set by lavc (default 0)\
+     */\
+    int palette_has_changed;\
 
 #define FF_QSCALE_TYPE_MPEG1   0
 #define FF_QSCALE_TYPE_MPEG2   1
@@ -1345,6 +1351,13 @@ typedef struct AVCodecContext {
      * - decoding: unused
      */
     int lmax;
+
+    /**
+     * Palette control structure
+     * - encoding: ??? (no palette-enabled encoder yet)
+     * - decoding: set by user.
+     */
+    struct AVPaletteControl *palctrl;
     
 } AVCodecContext;
 
@@ -1426,17 +1439,18 @@ typedef struct AVPicture {
  * This structure defines a method for communicating palette changes
  * between and demuxer and a decoder.
  */
+#define AVPALETTE_SIZE 256
 typedef struct AVPaletteControl {
 
     /* demuxer sets this to 1 to indicate the palette has changed;
      * decoder resets to 0 */
     int palette_changed;
 
-    /* 256 3-byte RGB palette entries; the components should be
-     * formatted in the buffer as "RGBRGB..." and should be scaled to
-     * 8 bits if they originally represented 6-bit VGA palette
-     * components */
-    unsigned char palette[256 * 3];
+    /* 4-byte ARGB palette entries, stored in native byte order; note that
+     * the individual palette components should be on a 8-bit scale; if
+     * the palette data comes from a IBM VGA native format, the component
+     * data is probably 6 bits in size and needs to be scaled */
+    unsigned int palette[AVPALETTE_SIZE];
 
 } AVPaletteControl;