vl: initial commit of the bitstream parser

src/gallium/state_trackers/vdpau/decode.c

@@ -211,11 +211,19 @@ vlVdpDecoderRenderMpeg2    (vlVdpDecoder *vldecoder,
 	
 	ret = vlVdpCreateSurfaceTarget(vldecoder,t_vdp_surf);
 
-	vlVdpBitstreamToMacroblock(vpipe->screen, bitstream_buffers,
-                     &num_macroblocks, &pipe_macroblocks);
+	if (vlVdpMPEG2BitstreamToMacroblock(vpipe->screen, bitstream_buffers, bitstream_buffer_count,
+                     &num_macroblocks, &pipe_macroblocks))
+					 {
+						 debug_printf("[VDPAU] Error in frame-header. Skipping.\n");
+						 
+						 ret = VDP_STATUS_OK;
+						 goto skip_frame;
+					 }
 		
 	vpipe->set_decode_target(vpipe,t_surf);
-	vpipe->decode_macroblocks(vpipe, p_surf, f_surf, num_macroblocks, pipe_macroblocks, NULL);
+	vpipe->decode_macroblocks(vpipe, p_surf, f_surf, num_macroblocks, (struct pipe_macroblock *)pipe_macroblocks, NULL);
+	
+	skip_frame:
 	return ret;
 }
 

src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c

@@ -27,18 +27,89 @@
 
 #include "mpeg2_bitstream_parser.h"
 
-void
-vlVdpBitstreamToMacroblock (
+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)
 {
-	debug_printf("[VDPAU] BitstreamToMacroblock not implemented yet");
-	assert(0);
-
+	bool b_header_done = false;
+	struct vdpMPEG2BitstreamParser parser;
+	
+	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;
+	return 0;
 }
 

src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.h

@@ -32,10 +32,27 @@
 #include <pipe/p_video_state.h>
 #include "vdpau_private.h"
 
-void
-vlVdpBitstreamToMacroblock(struct pipe_screen *screen,
+enum vdpMPEG2States
+{
+	MPEG2_HEADER_START_CODE,
+	MPEG2_HEADER_DONE
+};
+
+struct vdpMPEG2BitstreamParser
+{
+	enum vdpMPEG2States state;
+	uint32_t cursor;                // current bit cursor
+	uint32_t cur_bitstream;
+	uint32_t cur_bitstream_length;
+	unsigned char *ptr_bitstream;
+};
+
+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);
+				  
 
 #endif // MPEG2_BITSTREAM_PARSER_H

src/gallium/state_trackers/xorg/xvmc/subpicture.c

@@ -219,7 +219,7 @@ Status XvMCClearSubpicture(Display *dpy, XvMCSubpicture *subpicture, short x, sh
    if (!subpicture)
       return XvMCBadSubpicture;
 	  	
-   /* Convert color to */
+   /* Convert color to float */
    util_format_read_4f(PIPE_FORMAT_B8G8R8A8_UNORM,
                     color_f, 1,
                     &color, 4,