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mpv/libmpeg2/decode.c

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/* 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 "0.2.0-release"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include "config.h"
#include "video_out.h"
#include <inttypes.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
#include "mm_accel.h"
//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;
#ifdef MPEG12_POSTPROC
int quant_store[MBR+1][MBC+1]; // [Review]
#endif
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 ();
}
static vo_frame_t frames[4];
void mpeg2_allocate_image_buffers (picture_t * picture)
{
int frame_size,buff_size;
unsigned char *base=NULL;
int i;
// 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
#ifdef MPEG12_POSTPROC
for(i=0;i<4;i++){
#else
for(i=0;i<3;i++){
#endif
base = shmem_alloc(buff_size);
frames[i].base[0] = base;
frames[i].base[1] = base + frame_size * 5 / 4;
frames[i].base[2] = base + frame_size;
frames[i].copy = NULL;
frames[i].vo = NULL;
frames[i].slice=0;
}
picture->forward_reference_frame=&frames[0];
picture->backward_reference_frame=&frames[1];
picture->current_frame=&frames[2];
}
static void copy_slice (vo_frame_t * frame, uint8_t ** src){
vo_functions_t * output = frame->vo;
int stride[3];
int y=frame->slice*16;
stride[0]=picture->coded_picture_width;
stride[1]=stride[2]=stride[0]/2;
output->draw_slice (src, stride,
picture->display_picture_width,
(y+16<=picture->display_picture_height) ? 16 :
picture->display_picture_height-y,
0, y);
++frame->slice;
}
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 (((picture->picture_structure == FRAME_PICTURE) ||
(picture->second_field))
) {
#ifdef MPEG12_POSTPROC
if(picture->pp_options){
// apply OpenDivX postprocess filter
int stride[3];
stride[0]=picture->coded_picture_width;
stride[1]=stride[2]=stride[0]/2;
postprocess((picture->picture_coding_type == B_TYPE) ?
picture->current_frame->base :
picture->forward_reference_frame->base,
stride[0], frames[3].base, stride[0],
picture->coded_picture_width, picture->coded_picture_height,
&quant_store[1][1], (MBC+1), picture->pp_options);
output->draw_slice (frames[3].base, stride,
picture->display_picture_width,
picture->display_picture_height, 0, 0);
} else
#endif
#if 1
if (picture->picture_coding_type != B_TYPE) {
int stride[3];
stride[0]=picture->coded_picture_width;
stride[1]=stride[2]=stride[0]/2;
output->draw_slice (picture->forward_reference_frame->base,
stride,
picture->display_picture_width,
picture->display_picture_height, 0, 0);
}
#endif
}
#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 ();
// set current_frame pointer:
if (picture->second_field){
// vo_field (picture->current_frame, picture->picture_structure);
} else {
if (picture->picture_coding_type == B_TYPE){
picture->current_frame = &frames[2];
#ifdef MPEG12_POSTPROC
if(picture->pp_options)
picture->current_frame->copy=NULL; else
#endif
picture->current_frame->copy=copy_slice;
} else {
picture->current_frame = picture->forward_reference_frame;
picture->forward_reference_frame = picture->backward_reference_frame;
picture->backward_reference_frame = picture->current_frame;
picture->current_frame->copy=NULL;
}
}
picture->current_frame->vo=output;
picture->current_frame->slice=0;
}
if (!drop_frame) {
slice_process (picture, code, buffer);
#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;
}
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