X-Git-Url: https://git.libre-soc.org/?a=blobdiff_plain;f=src%2Fgallium%2Fstate_trackers%2Fvdpau%2Fmpeg2_bitstream_parser.c;h=3c456a07ca1c8ab366e97167e5a873734de30085;hb=65fe0866aec7b5608419f6d184cb1fa4fe1dc45a;hp=e69de29bb2d1d6434b8b29ae775ad8c2e48c5391;hpb=966b836e2d5142e01b0286c864ca4a6f1be5b706;p=mesa.git

diff --git a/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c b/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c
index e69de29bb2d..3c456a07ca1 100644
--- a/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c
+++ b/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c
@@ -0,0 +1,117 @@
+/**************************************************************************
+ *
+ * Copyright 2010 Thomas Balling Sørensen.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
+ * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
+ * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+ * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+ * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "mpeg2_bitstream_parser.h"
+
+int
+vlVdpMPEG2NextStartCode(struct vdpMPEG2BitstreamParser *parser)
+{
+	uint32_t integer = 0;
+	uint32_t bytes_to_end;
+	
+	/* Move cursor to the start of a byte */
+	while(parser->cursor % 8)
+		parser->cursor++;
+		
+	bytes_to_end = parser->cur_bitstream_length - parser->cursor/8 - 1;
+		
+	/* Read byte after byte, until startcode is found */
+	while(integer != 0x00000100)
+	{
+		if (bytes_to_end < 0)
+		{
+			parser->state = MPEG2_HEADER_DONE;
+			return 1;
+		}
+		
+		integer << 8;
+		integer = integer & (unsigned char)(parser->ptr_bitstream + parser->cursor/8)[0];
+	
+		bytes_to_end--;
+		parser->cursor += 8;
+		
+	}
+	
+	/* start_code found. rewind cursor a byte */
+	parser->cursor -= 8;
+	
+	return 0;
+}
+
+int
+vlVdpMPEG2BitstreamToMacroblock (
+		  struct pipe_screen *screen,
+		  VdpBitstreamBuffer const *bitstream_buffers,
+		  uint32_t bitstream_buffer_count,
+          unsigned int *num_macroblocks,
+          struct pipe_mpeg12_macroblock **pipe_macroblocks)
+{
+	bool b_header_done = false;
+	struct vdpMPEG2BitstreamParser parser;
+	
+	debug_printf("[VDPAU] Starting decoding MPEG2 stream");
+	
+	num_macroblocks[0] = 0;
+	
+	memset(&parser,0,sizeof(parser));
+	parser.state = MPEG2_HEADER_START_CODE;
+	parser.cur_bitstream_length = bitstream_buffers[0].bitstream_bytes;
+	parser.ptr_bitstream = (unsigned char *)bitstream_buffers[0].bitstream;
+	
+	/* Main header parser loop */
+	while(!b_header_done)
+	{
+		switch (parser.state)
+		{
+		case MPEG2_HEADER_START_CODE:
+			if (vlVdpMPEG2NextStartCode(&parser))
+				continue;
+			
+			/* Start_code found */
+			switch ((parser.ptr_bitstream + parser.cursor/8)[0])
+			{
+				/* sequence_header_code */
+				case 0xB3:
+				debug_printf("[VDPAU][Bitstream parser] Sequence header code found at cursor pos: %d\n", parser.cursor);
+				exit(1);
+				break;
+			}
+		
+		break;
+		case MPEG2_HEADER_DONE:
+			debug_printf("[VDPAU][Bitstream parser] Done parsing current header\n");
+		break;
+		
+		}
+		
+		
+	}
+	
+
+	return 0;
+}
+