libmpeg2 4:2:2 decoding

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@13996 b3059339-0415-0410-9bf9-f77b7e298cf2

2 files changed, 128 insertions, 1 deletions

diff --git a/libmpeg2/Makefile b/libmpeg2/Makefile
index 137957b23e..791493a108 100644
--- a/libmpeg2/Makefile
+++ b/libmpeg2/Makefile
@@ -3,7 +3,7 @@ LIBNAME = libmpeg2.a
 
 include ../config.mak
 
-SRCS	= alloc.c cpu_accel.c cpu_state.c decode.c header.c idct.c motion_comp.c slice.c
+SRCS	= alloc.c cpu_accel.c cpu_state.c decode.c header.c idct.c motion_comp.c slice.c uyvy.c
 
 OBJS	= $(SRCS:.c=.o)
 INCLUDE = -I. -I../libvo -I.. $(EXTRA_INC)
diff --git a/libmpeg2/uyvy.c b/libmpeg2/uyvy.c
new file mode 100644
index 0000000000..7b1759eb10
--- /dev/null
+++ b/libmpeg2/uyvy.c
@@ -0,0 +1,127 @@
+/*
+ * uyvy.c
+ * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 2003      Regis Duchesne <hpreg@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ * See http://libmpeg2.sourceforge.net/ for updates.
+ *
+ * mpeg2dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpeg2dec 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "config.h"
+
+#include <inttypes.h>
+
+#include "mpeg2.h"
+//#include "mpeg2convert.h"
+
+typedef struct {
+    int width;
+    int stride;
+    int chroma420;
+    uint8_t * out;
+} convert_uyvy_t;
+
+static void uyvy_start (void * _id, const mpeg2_fbuf_t * fbuf,
+			const mpeg2_picture_t * picture,
+			const mpeg2_gop_t * gop)
+{
+    convert_uyvy_t * instance = (convert_uyvy_t *) _id;
+
+    instance->out = fbuf->buf[0];
+    instance->stride = instance->width;
+    if (picture->nb_fields == 1) {
+	if (! (picture->flags & PIC_FLAG_TOP_FIELD_FIRST))
+	    instance->out += 2 * instance->stride;
+	instance->stride <<= 1;
+    }
+}
+
+#ifdef WORDS_BIGENDIAN
+#define PACK(a,b,c,d) (((a) << 24) | ((b) << 16) | ((c) << 8) | (d))
+#else
+#define PACK(a,b,c,d) (((d) << 24) | ((c) << 16) | ((b) << 8) | (a))
+#endif
+
+static void uyvy_line (uint8_t * py, uint8_t * pu, uint8_t * pv, void * _dst,
+		       int width)
+{
+    uint32_t * dst = (uint32_t *) _dst;
+
+    width >>= 4;
+    do {
+	dst[0] = PACK (pu[0],  py[0], pv[0],  py[1]);
+	dst[1] = PACK (pu[1],  py[2], pv[1],  py[3]);
+	dst[2] = PACK (pu[2],  py[4], pv[2],  py[5]);
+	dst[3] = PACK (pu[3],  py[6], pv[3],  py[7]);
+	dst[4] = PACK (pu[4],  py[8], pv[4],  py[9]);
+	dst[5] = PACK (pu[5], py[10], pv[5], py[11]);
+	dst[6] = PACK (pu[6], py[12], pv[6], py[13]);
+	dst[7] = PACK (pu[7], py[14], pv[7], py[15]);
+	py += 16;
+	pu += 8;
+	pv += 8;
+	dst += 8;
+    } while (--width);
+}
+
+static void uyvy_copy (void * id, uint8_t * const * src, unsigned int v_offset)
+{
+    const convert_uyvy_t * instance = (convert_uyvy_t *) id;
+    uint8_t * py;
+    uint8_t * pu;
+    uint8_t * pv;
+    uint8_t * dst;
+    int height;
+
+    dst = instance->out + 2 * instance->stride * v_offset;
+    py = src[0]; pu = src[1]; pv = src[2];
+
+    height = 16;
+    do {
+	uyvy_line (py, pu, pv, dst, instance->width);
+	dst += 2 * instance->stride;
+	py += instance->stride;
+	if (! (--height & instance->chroma420)) {
+	    pu += instance->stride >> 1;
+	    pv += instance->stride >> 1;
+	}
+    } while (height);
+}
+
+int mpeg2convert_uyvy (int stage, void * _id, const mpeg2_sequence_t * seq,
+		       int stride, uint32_t accel, void * arg,
+		       mpeg2_convert_init_t * result)
+{
+    convert_uyvy_t * instance = (convert_uyvy_t *) _id;
+
+    if (seq->chroma_width == seq->width)
+	return 1;
+
+    if (instance) {
+	instance->width = seq->width;
+	instance->chroma420 = (seq->chroma_height < seq->height);
+	result->buf_size[0] = seq->width * seq->height * 2;
+	result->buf_size[1] = result->buf_size[2] = 0;
+	result->start = uyvy_start;
+	result->copy = uyvy_copy;
+    } else {
+	result->id_size = sizeof (convert_uyvy_t);
+    }
+
+    return 0;
+}