mpv/libmpcodecs/vd_libmpeg2.c

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#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#ifdef USE_LIBMPEG2
#include "mp_msg.h"
#include "vd_internal.h"
static vd_info_t info =
{
"MPEG 1/2 Video decoder v2.0",
"libmpeg2",
"A'rpi",
"Aaron & Walken",
"native"
};
LIBVD_EXTERN(libmpeg2)
#define USE_SIGJMP_TRICK
#ifdef USE_SIGJMP_TRICK
#include <signal.h>
#include <setjmp.h>
#endif
//#include "libmpdemux/parse_es.h"
#include "libvo/video_out.h" // FIXME!!!
#include "libmpeg2/mpeg2.h"
#include "libmpeg2/mpeg2_internal.h"
#include "libmpeg2/mm_accel.h"
#include "../cpudetect.h"
mpeg2_config_t config; // FIXME!!!
static picture_t *picture=NULL; // exported from libmpeg2/decode.c
static int table_init_state=0;
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...){
return CONTROL_UNKNOWN;
}
static vo_frame_t frames[3];
// init driver
static int init(sh_video_t *sh){
config.flags = 0;
if(gCpuCaps.hasMMX)
config.flags |= MM_ACCEL_X86_MMX;
if(gCpuCaps.hasMMX2)
config.flags |= MM_ACCEL_X86_MMXEXT;
if(gCpuCaps.has3DNow)
config.flags |= MM_ACCEL_X86_3DNOW;
#ifdef HAVE_MLIB
config.flags |= MM_ACCEL_MLIB;
#endif
picture=malloc(sizeof(picture_t)); // !!! NEW HACK :) !!!
memset(picture,0,sizeof(picture_t));
header_state_init (picture);
if(!table_init_state){
idct_init ();
motion_comp_init ();
table_init_state=1;
}
picture->pp_options=divx_quality;
memset(frames,0,3*sizeof(vo_frame_t));
picture->forward_reference_frame=&frames[0];
picture->backward_reference_frame=&frames[1];
picture->temp_frame=&frames[2];
picture->current_frame=NULL;
// send seq header to the decoder: *** HACK ***
// mpeg2_decode_data(NULL,videobuffer,videobuffer+videobuf_len,0);
// mpeg2_allocate_image_buffers (picture);
return mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_YV12);
}
// uninit driver
static void uninit(sh_video_t *sh){
// mpeg2_free_image_buffers (picture);
}
static void draw_slice (vo_frame_t * frame, uint8_t ** src){
int stride[3];
int y=picture->slice<<4;
stride[0]=picture->coded_picture_width;
stride[1]=stride[2]=stride[0]/2;
mpcodecs_draw_slice(frame->vo, src,
stride, picture->display_picture_width,
(y+16<=picture->display_picture_height) ? 16 :
picture->display_picture_height-y,
0, y);
++picture->slice;
}
static int in_slice_flag=0; // FIXME! move to picture struct
static int drop_frame=0; // FIXME! move to picture struct
static mp_image_t* parse_chunk (sh_video_t* sh, int code, uint8_t * buffer, int framedrop){
mp_image_t* mpi=NULL;
// stats_header (code, buffer);
if (in_slice_flag && ((!code) || (code >= 0xb0))) {
// ok, we've completed decoding a frame/field!
in_slice_flag = 0;
mpi=picture->display_frame->mpi;
if(picture->picture_structure!=FRAME_PICTURE && !picture->second_field)
mpi=NULL; // we don't draw first fields!
}
switch (code) {
case 0x00: /* picture_start_code */
if (header_process_picture_header (picture, buffer)) {
printf ("bad picture header\n");
}
drop_frame = framedrop && (picture->picture_coding_type == B_TYPE);
drop_frame |= framedrop>=2; // hard drop
break;
case 0xb3: /* sequence_header_code */
if (header_process_sequence_header (picture, buffer)) {
printf ("bad sequence header\n");
}
break;
case 0xb5: /* extension_start_code */
if (header_process_extension (picture, buffer)) {
printf ("bad extension\n");
}
break;
default:
if (code >= 0xb0) break;
if (!in_slice_flag) {
in_slice_flag = 1;
// set current_frame pointer:
if (!picture->second_field){
mp_image_t* mpi;
int flags;
if (picture->picture_coding_type == B_TYPE){
flags=(!framedrop && vd_use_slices &&
picture->picture_structure==FRAME_PICTURE) ?
MP_IMGFLAG_DRAW_CALLBACK:0;
picture->display_frame=
picture->current_frame = picture->temp_frame;
} else {
flags=MP_IMGFLAG_PRESERVE|MP_IMGFLAG_READABLE;
picture->current_frame = picture->forward_reference_frame;
picture->display_frame=
picture->forward_reference_frame = picture->backward_reference_frame;
picture->backward_reference_frame = picture->current_frame;
}
mpi=mpcodecs_get_image(sh,MP_IMGTYPE_IPB, flags,
picture->coded_picture_width,
picture->coded_picture_height);
// ok, lets see what did we get:
if(mpi->flags&MP_IMGFLAG_DRAW_CALLBACK &&
!(mpi->flags&MP_IMGFLAG_DIRECT)){
// nice, filter/vo likes draw_callback :)
picture->current_frame->copy=draw_slice;
} else
picture->current_frame->copy=NULL;
// let's, setup pointers!
picture->current_frame->base[0]=mpi->planes[0];
picture->current_frame->base[1]=mpi->planes[1];
picture->current_frame->base[2]=mpi->planes[2];
picture->current_frame->mpi=mpi; // tricky!
#if 1
if(!picture->forward_reference_frame->base[0]){
// workaround for sig11
picture->forward_reference_frame->base[0]=mpi->planes[0];
picture->forward_reference_frame->base[1]=mpi->planes[1];
picture->forward_reference_frame->base[2]=mpi->planes[2];
}
if(!picture->backward_reference_frame->base[0]){
// workaround for sig11
picture->backward_reference_frame->base[0]=mpi->planes[0];
picture->backward_reference_frame->base[1]=mpi->planes[1];
picture->backward_reference_frame->base[2]=mpi->planes[2];
}
#endif
#ifdef MPEG12_POSTPROC
mpi->qscale=&picture->current_frame->quant_store[1][1];
mpi->qstride=(MPEG2_MBC+1);
#endif
mp_msg(MSGT_DECVIDEO,MSGL_DBG2,"mpeg2: [%c] %p %s \n",
(picture->picture_coding_type == B_TYPE) ? 'B':'P',
mpi, (mpi->flags&MP_IMGFLAG_DIRECT)?"DR!":"");
}
picture->current_frame->vo=sh;
picture->slice=0;
}
if (!drop_frame) {
slice_process (picture, code, buffer);
#ifdef ARCH_X86
if (config.flags & MM_ACCEL_X86_MMX) __asm__ __volatile__ ("emms");
#endif
}
}
return mpi;
}
#ifdef USE_SIGJMP_TRICK
static jmp_buf mpeg2_jmp_buf;
static void mpeg2_sighandler(int sig){
longjmp(mpeg2_jmp_buf,1);
}
#endif
// decode a frame
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){
static uint32_t code;
static uint8_t* pos;
static uint8_t* current;
uint8_t* end=data+len;
static mp_image_t* mpi;
mp_image_t* ret=NULL;
int framedrop=flags&3;
void* old_sigh;
// Note: static is REQUIRED because of longjmp() may destroy stack!
pos=NULL;
current=data;
mpi=NULL;
#ifdef USE_SIGJMP_TRICK
old_sigh=signal(SIGSEGV,mpeg2_sighandler);
#endif
while(current<end){
// FIND NEXT HEAD:
static unsigned int head;
static uint8_t c;
head=-1;
//--------------------
while(current<end){
c=current[0];
++current;
head<<=8;
if(head==0x100) break; // synced
head|=c;
}
//--------------------
if(pos){
#ifdef USE_SIGJMP_TRICK
if(setjmp(mpeg2_jmp_buf)){
#ifdef ARCH_X86
if (config.flags & MM_ACCEL_X86_MMX) __asm__ __volatile__ ("emms");
#endif
printf("@@@ libmpeg2 returned from sig11... (bad file?) @@@\n");
} else
#endif
{
ret=parse_chunk(sh, code&0xFF, pos, framedrop);
if(ret) mpi=ret;
}
}
//--------------------
pos=current;code=head|c;
}
#ifdef USE_SIGJMP_TRICK
signal(SIGSEGV,old_sigh); // restore sighandler
#endif
// if(code==0x1FF){
ret=parse_chunk(sh, 0xFF, NULL, framedrop); // send 'end of frame'
if(ret) mpi=ret;
// }
if(mpi){
static int last_non_b_type= 0;
if(picture->picture_coding_type == B_TYPE)
mpi->pict_type= B_TYPE;
else{
mpi->pict_type= last_non_b_type;
last_non_b_type= picture->picture_coding_type;
}
}
return mpi;
}
#endif