diff options
author | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-09-27 23:07:05 +0000 |
---|---|---|
committer | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2002-09-27 23:07:05 +0000 |
commit | d97d29a54f272cdfd2b097d9d8a2e900547555b0 (patch) | |
tree | a1373fcb601bced6e0eb6ec5c6ce31857fac73fb /libmpcodecs/vd_cyuv.c | |
parent | 5bda0616478f50e3465687038178c7fc827a49d4 (diff) | |
download | mpv-d97d29a54f272cdfd2b097d9d8a2e900547555b0.tar.bz2 mpv-d97d29a54f272cdfd2b097d9d8a2e900547555b0.tar.xz |
decoder merged, using mpi now. support for stride, and outfmt 411p,422p
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@7520 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'libmpcodecs/vd_cyuv.c')
-rw-r--r-- | libmpcodecs/vd_cyuv.c | 103 |
1 files changed, 88 insertions, 15 deletions
diff --git a/libmpcodecs/vd_cyuv.c b/libmpcodecs/vd_cyuv.c index 1b1f9399d9..49f2456cc0 100644 --- a/libmpcodecs/vd_cyuv.c +++ b/libmpcodecs/vd_cyuv.c @@ -1,3 +1,21 @@ +/* ------------------------------------------------------------------------ + * Creative YUV Video Decoder + * + * Dr. Tim Ferguson, 2001. + * For more details on the algorithm: + * http://www.csse.monash.edu.au/~timf/videocodec.html + * + * Code restructured, and adopted to MPlayer's mpi by A'rpi, 2002. + * + * This is a very simple predictive coder. A video frame is coded in YUV411 + * format. The first pixel of each scanline is coded using the upper four + * bits of its absolute value. Subsequent pixels for the scanline are coded + * using the difference between the last pixel and the current pixel (DPCM). + * The DPCM values are coded using a 16 entry table found at the start of the + * frame. Thus four bits per component are used and are as follows: + * UY VY YY UY VY YY UY VY... + * ------------------------------------------------------------------------ */ + #include <stdio.h> #include <stdlib.h> @@ -23,34 +41,89 @@ static int control(sh_video_t *sh,int cmd,void* arg,...){ // init driver static int init(sh_video_t *sh){ - return mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_UYVY); + return mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_411P); } // uninit driver static void uninit(sh_video_t *sh){ } -//mp_image_t* mpcodecs_get_image(sh_video_t *sh, int mp_imgtype, int mp_imgflag, int w, int h); - -void decode_cyuv( - unsigned char *buf, - int size, - unsigned char *frame, - int width, - int height, - int format); - // decode a frame static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags){ mp_image_t* mpi; - if(len<=0) return NULL; // skipped frame + unsigned int xpos, ypos; + unsigned char *delta_y_tbl = ((unsigned char*)data)+16; + unsigned char *delta_c_tbl = ((unsigned char*)data)+32; + unsigned char *ptr = ((unsigned char*)data)+48; + + if(len<=48) return NULL; // skipped/broken frame - mpi=mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, 0, + mpi=mpcodecs_get_image(sh, MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE, sh->disp_w, sh->disp_h); if(!mpi) return NULL; - decode_cyuv(data, len, mpi->planes[0], sh->disp_w, sh->disp_h, - sh->codec->outfmt[sh->outfmtidx]); + for(ypos = 0; ypos < mpi->h; ypos++){ + unsigned int i; + unsigned char cur_Y1,cur_Y2,cur_U,cur_V; + unsigned char *frame=mpi->planes[0]+mpi->stride[0]*ypos; + unsigned char *uframe=mpi->planes[1]+mpi->stride[1]*ypos; + unsigned char *vframe=mpi->planes[2]+mpi->stride[2]*ypos; + + for(xpos = 0; xpos < mpi->w; xpos += 2){ + + if(xpos&2){ + i = *(ptr++); + cur_Y1 = (cur_Y2 + delta_y_tbl[i & 0x0f])/* & 0xff*/; + cur_Y2 = (cur_Y1 + delta_y_tbl[i >> 4])/* & 0xff*/; + } else { + if(xpos == 0) { /* first pixels in scanline */ + cur_U = *(ptr++); + cur_Y1= (cur_U & 0x0f) << 4; + cur_U = cur_U & 0xf0; + cur_V = *(ptr++); + cur_Y2= (cur_Y1 + delta_y_tbl[cur_V & 0x0f])/* & 0xff*/; + cur_V = cur_V & 0xf0; + } else { /* subsequent pixels in scanline */ + i = *(ptr++); + cur_U = (cur_U + delta_c_tbl[i >> 4])/* & 0xff*/; + cur_Y1= (cur_Y2 + delta_y_tbl[i & 0x0f])/* & 0xff*/; + i = *(ptr++); + cur_V = (cur_V + delta_c_tbl[i >> 4])/* & 0xff*/; + cur_Y2= (cur_Y1 + delta_y_tbl[i & 0x0f])/* & 0xff*/; + } + } + + // ok, store the pixels: + switch(mpi->imgfmt){ + case IMGFMT_YUY2: + *frame++ = cur_Y1; + *frame++ = cur_U; + *frame++ = cur_Y2; + *frame++ = cur_V; + break; + case IMGFMT_UYVY: + *frame++ = cur_U; + *frame++ = cur_Y1; + *frame++ = cur_V; + *frame++ = cur_Y2; + break; + case IMGFMT_422P: + *uframe++ = cur_U; + *vframe++ = cur_V; + *frame++ = cur_Y1; + *frame++ = cur_Y2; + break; + case IMGFMT_411P: + if(!(xpos&2)){ + *uframe++ = cur_U; + *vframe++ = cur_V; + } + *frame++ = cur_Y1; + *frame++ = cur_Y2; + break; + } + } // xpos + } // ypos return mpi; } |