Initial revision

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@2 b3059339-0415-0410-9bf9-f77b7e298cf2

1 files changed, 319 insertions, 0 deletions

diff --git a/libmpeg2/decode.c b/libmpeg2/decode.c
new file mode 100644
index 0000000000..e8bbb02112
--- /dev/null
+++ b/libmpeg2/decode.c
@@ -0,0 +1,319 @@
+/* Copyright (C) Aaron Holtzman <aholtzma@ess.engr.uvic.ca> - Nov 1999 */
+/* Some cleanup & hacking by A'rpi/ESP-team - Oct 2000 */
+
+/* mpeg2dec version: */
+#define PACKAGE "mpeg2dec"
+//#define VERSION "0.1.7-cvs"
+#define VERSION "0.1.8-cvs"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "config.h"
+
+//#include "video_out.h"
+
+#include "mpeg2.h"
+#include "mpeg2_internal.h"
+
+#include "../linux/shmem.h"
+
+//#include "motion_comp.h"
+//#include "idct.h"
+//#include "header.h"
+//#include "slice.h"
+//#include "stats.h"
+
+#include "attributes.h"
+#ifdef __i386__
+#include "mmx.h"
+#endif
+
+//this is where we keep the state of the decoder
+//picture_t picture_data;
+//picture_t *picture=&picture_data;
+picture_t *picture=NULL;
+
+//global config struct
+mpeg2_config_t config;
+
+// the maximum chunk size is determined by vbv_buffer_size which is 224K for
+// MP@ML streams. (we make no pretenses ofdecoding anything more than that)
+//static uint8_t chunk_buffer[224 * 1024 + 4];
+//static uint32_t shift = 0;
+
+static int drop_flag = 0;
+static int drop_frame = 0;
+
+int quant_store[MBR+1][MBC+1]; // [Review]
+
+void mpeg2_init (void)
+{
+
+    printf (PACKAGE"-"VERSION" (C) 2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>\n");
+    config.flags = 0;
+#ifdef HAVE_MMX
+    config.flags |= MM_ACCEL_X86_MMX;
+#endif
+#ifdef HAVE_SSE
+    config.flags |= MM_ACCEL_X86_MMXEXT;
+#endif
+#ifdef HAVE_3DNOW
+    config.flags |= MM_ACCEL_X86_3DNOW;
+#endif
+#ifdef HAVE_MLIB
+    config.flags |= MM_ACCEL_MLIB;
+#endif
+
+    printf("libmpeg2 config flags = 0x%X\n",config.flags);
+
+    picture=shmem_alloc(sizeof(picture_t)); // !!! NEW HACK :) !!!
+
+    header_state_init (picture);
+    picture->repeat_count=0;
+    
+    picture->pp_options=0;
+
+    idct_init ();
+    motion_comp_init ();
+}
+
+void mpeg2_allocate_image_buffers (picture_t * picture)
+{
+	int frame_size,buff_size;
+        unsigned char *base=NULL;
+
+        // height+1 requires for yuv2rgb_mmx code (it reads next line after last)
+	frame_size = picture->coded_picture_width * (1+picture->coded_picture_height);
+        frame_size = (frame_size+31)&(~31); // align to 32 byte boundary
+        buff_size = frame_size + (frame_size/4)*2; // 4Y + 1U + 1V
+
+	// allocate images in YV12 format
+        base = shmem_alloc(buff_size);
+	picture->throwaway_frame[0] = base;
+	picture->throwaway_frame[1] = base + frame_size * 5 / 4;
+	picture->throwaway_frame[2] = base + frame_size;
+
+        base = shmem_alloc(buff_size);
+	picture->backward_reference_frame[0] = base;
+	picture->backward_reference_frame[1] = base + frame_size * 5 / 4;
+	picture->backward_reference_frame[2] = base + frame_size;
+
+        base = shmem_alloc(buff_size);
+	picture->forward_reference_frame[0] = base;
+	picture->forward_reference_frame[1] = base + frame_size * 5 / 4;
+	picture->forward_reference_frame[2] = base + frame_size;
+
+        base = shmem_alloc(buff_size);
+	picture->pp_frame[0] = base;
+	picture->pp_frame[1] = base + frame_size * 5 / 4;
+	picture->pp_frame[2] = base + frame_size;
+
+}
+
+static void decode_reorder_frames (void)
+{
+    if (picture->picture_coding_type != B_TYPE) {
+
+	//reuse the soon to be outdated forward reference frame
+	picture->current_frame[0] = picture->forward_reference_frame[0];
+	picture->current_frame[1] = picture->forward_reference_frame[1];
+	picture->current_frame[2] = picture->forward_reference_frame[2];
+
+	//make the backward reference frame the new forward reference frame
+	picture->forward_reference_frame[0] =
+	    picture->backward_reference_frame[0];
+	picture->forward_reference_frame[1] =
+	    picture->backward_reference_frame[1];
+	picture->forward_reference_frame[2] =
+	    picture->backward_reference_frame[2];
+
+	picture->backward_reference_frame[0] = picture->current_frame[0];
+	picture->backward_reference_frame[1] = picture->current_frame[1];
+	picture->backward_reference_frame[2] = picture->current_frame[2];
+
+    } else {
+
+	picture->current_frame[0] = picture->throwaway_frame[0];
+	picture->current_frame[1] = picture->throwaway_frame[1];
+	picture->current_frame[2] = picture->throwaway_frame[2];
+
+    }
+}
+
+static int in_slice_flag=0;
+
+static int parse_chunk (vo_functions_t * output, int code, uint8_t * buffer)
+{
+    int is_frame_done = 0;
+
+    stats_header (code, buffer);
+
+    is_frame_done = in_slice_flag && ((!code) || (code >= 0xb0));
+    if (is_frame_done) {
+	in_slice_flag = 0;
+        
+        if(picture->picture_structure != FRAME_PICTURE) printf("Field! %d  \n",picture->second_field);
+        
+	    if ( ((HACK_MODE == 2) || (picture->mpeg1))
+                && ((picture->picture_structure == FRAME_PICTURE) ||
+		 (picture->second_field))
+            ) {
+	        uint8_t ** bar;
+                int stride[3];
+
+		if (picture->picture_coding_type == B_TYPE)
+		    bar = picture->throwaway_frame;
+		else
+		    bar = picture->forward_reference_frame;
+                
+                stride[0]=picture->coded_picture_width;
+                stride[1]=stride[2]=stride[0]/2;
+
+                if(picture->pp_options){
+                    // apply OpenDivX postprocess filter
+                    postprocess(bar, stride[0],
+                        picture->pp_frame, stride[0],
+                        picture->coded_picture_width, picture->coded_picture_height, 
+                        &quant_store[1][1], (MBC+1), picture->pp_options);
+		    output->draw_slice (picture->pp_frame, stride, 
+                        picture->display_picture_width,
+                        picture->display_picture_height, 0, 0);
+                } else {
+		    output->draw_slice (bar, stride, 
+                        picture->display_picture_width,
+                        picture->display_picture_height, 0, 0);
+                }
+                
+	    }
+#ifdef ARCH_X86
+	    if (config.flags & MM_ACCEL_X86_MMX) emms ();
+#endif
+	    output->flip_page ();
+    }
+
+    switch (code) {
+    case 0x00:	/* picture_start_code */
+	if (header_process_picture_header (picture, buffer)) {
+	    printf ("bad picture header\n");
+	    exit (1);
+	}
+
+	drop_frame = drop_flag && (picture->picture_coding_type == B_TYPE);
+	//decode_reorder_frames ();
+	break;
+
+    case 0xb3:	/* sequence_header_code */
+	if (header_process_sequence_header (picture, buffer)) {
+	    printf ("bad sequence header\n");
+	    exit (1);
+	}
+	break;
+
+    case 0xb5:	/* extension_start_code */
+	if (header_process_extension (picture, buffer)) {
+	    printf ("bad extension\n");
+	    exit (1);
+	}
+	break;
+
+    default:
+//	if (code >= 0xb9)  printf ("stream not demultiplexed ?\n");
+	if (code >= 0xb0)  break;
+
+	if (!(in_slice_flag)) {
+	    in_slice_flag = 1;
+
+	    if(!(picture->second_field)) decode_reorder_frames ();
+	}
+
+	if (!drop_frame) {
+	    uint8_t ** bar;
+
+	    slice_process (picture, code, buffer);
+
+	    if ((HACK_MODE < 2) && (!(picture->mpeg1))) {
+		uint8_t * foo[3];
+	        uint8_t ** bar;
+		//frame_t * bar;
+                int stride[3];
+		int offset;
+
+		if (picture->picture_coding_type == B_TYPE)
+		    bar = picture->throwaway_frame;
+		else
+		    bar = picture->forward_reference_frame;
+
+		offset = (code-1) * 4 * picture->coded_picture_width;
+		if ((! HACK_MODE) && (picture->picture_coding_type == B_TYPE))
+		    offset = 0;
+
+		foo[0] = bar[0] + 4 * offset;
+		foo[1] = bar[1] + offset;
+		foo[2] = bar[2] + offset;
+                
+                stride[0]=picture->coded_picture_width;
+                stride[1]=stride[2]=stride[0]/2;
+
+		output->draw_slice (foo, stride, 
+                    picture->display_picture_width, 16, 0, (code-1)*16);
+	    }
+#ifdef ARCH_X86
+	    if (config.flags & MM_ACCEL_X86_MMX) emms ();
+#endif
+
+	}
+    }
+
+    return is_frame_done;
+}
+
+
+int mpeg2_decode_data (vo_functions_t *output, uint8_t *current, uint8_t *end)
+{
+    //static uint8_t code = 0xff;
+    //static uint8_t chunk_buffer[65536];
+    //static uint8_t *chunk_ptr = chunk_buffer;
+    //static uint32_t shift = 0;
+  uint8_t code;
+  uint8_t *pos=NULL;
+  uint8_t *start=current;
+  int ret = 0;
+
+//  printf("RCVD %d bytes\n",end-current);
+
+while(current<end){
+  // FIND NEXT HEAD:
+  unsigned int head=-1;
+  uint8_t c;
+  //--------------------
+  while(current<end){
+      c=current[0];
+      ++current;
+      head<<=8;
+      if(head==0x100) break; // synced
+      head|=c;
+  }
+  //--------------------
+  if(pos){
+    //if((code&0x100)!=0x100) printf("libmpeg2: FATAL! code=%X\n",code);
+    //printf("pos=%d  chunk %3X  size=%d  next-code=%X\n",pos-start,code,current-pos,head|c);
+    ret+=parse_chunk(output, code&0xFF, pos);
+  }
+  //--------------------
+  pos=current;code=head|c;
+}
+
+  if(code==0x1FF) ret+=parse_chunk(output, 0xFF, NULL); // send 'end of frame'
+
+    return ret;
+}
+
+void mpeg2_drop (int flag)
+{
+    drop_flag = flag;
+}
+