vl: implemented a few functions and made stubs to get mplayer running

[mesa.git] / src / gallium / state_trackers / vdpau / mpeg2_bitstream_parser.c

diff --git a/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c b/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c
index 39019660eddaff28f2333e734bb963234183e3b7..3c456a07ca1c8ab366e97167e5a873734de30085 100644 (file)
--- a/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c
+++ b/src/gallium/state_trackers/vdpau/mpeg2_bitstream_parser.c
@@ -27,18 +27,91 @@
 
 #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;
+       
+       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;
+       return 0;
 }