diff --git a/src/mpeg/pspjpeg.h b/src/mpeg/pspjpeg.h
index 614add4d..0760e2f0 100644
--- a/src/mpeg/pspjpeg.h
+++ b/src/mpeg/pspjpeg.h
@@ -17,6 +17,13 @@ extern "C" {
 
 #include <psptypes.h>
 
+#define SCE_JPEG_ERROR_BAD_MARKER_LENGTH 	(0x80650004)
+#define SCE_JPEG_ERROR_INVALID_POINTER 	    (0x80650010)
+#define SCE_JPEG_ERROR_UNSUPPORT_COLORSPACE (0x80650013)
+#define SCE_JPEG_ERROR_UNSUPPORT_SAMPLING 	(0x80650016)
+#define SCE_JPEG_ERROR_UNSUPPORT_IMAGE_SIZE (0x80650020)
+#define SCE_JPEG_ERROR_UNKNOWN_MARKER 	    (0x80650035)
+
 /**
  * Inits the MJpeg library 
  *
@@ -49,7 +56,9 @@ int sceJpegCreateMJpeg(int width, int height);
 int sceJpegDeleteMJpeg(void);
 
 /**
- * Decodes a mjpeg frame.
+ * Decodes a mjpeg frame to RGBA encoding.
+ * @note Input frame should be encoded as either yuv420p or yuvj420p, 
+ * returns SCE_JPEG_ERROR_UNSUPPORT_SAMPLING otherwise
  *
  * @param jpegbuf - the buffer with the mjpeg frame
  * @param size - size of the buffer pointed by jpegbuf
@@ -59,7 +68,48 @@ int sceJpegDeleteMJpeg(void);
  *
  * @return (width * 65536) + height on success, < 0 on error 
 */
-int sceJpegDecodeMJpeg(u8 *jpegbuf,	SceSize size, void *rgba, u32 unk);
+int sceJpegDecodeMJpeg(u8 *jpegbuf,	SceSize size, u8 *rgba, u32 unk);
+
+/**
+ * Reads information from mjpeg frame
+ *
+ * @param jpegbuf - the buffer with the mjpeg frame
+ * @param size - size of the mjpeg frame
+ * @param colourInfo - address where the mjpeg chroma information will be stored
+ * @param unk - Unknown, pass 0
+ *
+ * @return number of bytes needed in the buffer that will be used for YCbCr decoding, <= 0 on error
+*/
+int sceJpegGetOutputInfo(u8 *jpegbuf, SceSize size, int *colourInfo, int unk);
+
+/**
+ * Decodes a mjpeg frame to YCbCr encoding
+ * @note Input frame should be encoded as either yuv420p or yuvj420p, 
+ * returns SCE_JPEG_ERROR_UNSUPPORT_SAMPLING otherwise
+ *
+ * @param jpegbuf - the buffer with the mjpeg frame
+ * @param size - size of the buffer pointed by jpegbuf
+ * @param yCbCr - buffer where the decoded data in YCbCr format will be stored
+ * @param yCbCrSize - size of the buffer pointed by yCbCr (see sceJpegGetOutputInfo())
+ * @param unk - Unknown, pass 0
+ *
+ * @return (width * 65536) + height on success, < 0 on error 
+*/
+int sceJpegDecodeMJpegYCbCr(u8 *jpegbuf, SceSize size, u8 *yCbCr, SceSize yCbCrSize, u32 unk);
+
+/**
+ * Converts a frame from YCbCr to RGBA
+ *
+ * @param imageAddr - buffer where the converted data in RGBA format will be stored.
+ * @param yCbCrAddr - the buffer with the YCbCr data
+ * @param widthHeight - width and height of the frame (width * 65536) + height, 
+ *                          as returned by sceJpegDecodeMJpegYCbCr() or sceJpegDecodeMJpeg()
+ * @param bufferWidth - number of pixels per row of the buffer
+ * @param colourInfo - chroma subsampling mode, as provided by sceJpegGetOutputInfo()
+ *
+ * @return 0 on success, < 0 on error
+*/
+int sceJpegCsc(u8 *imageAddr, u8 *yCbCrAddr, int widthHeight, int bufferWidth, int colourInfo);
 
 #ifdef __cplusplus
 }
diff --git a/src/mpeg/sceJpeg.S b/src/mpeg/sceJpeg.S
index 775fd3c5..5f34a65a 100644
--- a/src/mpeg/sceJpeg.S
+++ b/src/mpeg/sceJpeg.S
@@ -24,7 +24,7 @@
 	IMPORT_FUNC	"sceJpeg",0x64B6F978,sceJpeg_64B6F978
 #endif
 #ifdef F_sceJpeg_0007
-	IMPORT_FUNC	"sceJpeg",0x67F0ED84,sceJpeg_67F0ED84
+	IMPORT_FUNC	"sceJpeg",0x67F0ED84,sceJpegCsc
 #endif
 #ifdef F_sceJpeg_0008
 	IMPORT_FUNC	"sceJpeg",0x7D2F3D7F,sceJpegFinishMJpeg