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/*
*
* QuickTime 8BPS decoder for Mplayer
* (c) 2003 Roberto Togni
*
* Fourcc: 8BPS
*
* Supports 8bpp (paletted), 24bpp and 32bpp (4th plane ignored)
*
*/
#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "bswap.h"
#include "mp_msg.h"
#include "vd_internal.h"
static vd_info_t info = {
"8BPS Video decoder",
"qt8bps",
"Roberto Togni",
"Roberto Togni",
"native codec"
};
LIBVD_EXTERN(qt8bps)
/*
* Decoder context
*/
typedef struct {
unsigned char planes;
unsigned char planemap[4];
unsigned char *palette;
} qt8bps_context_t;
/*
* Internal function prototypes
*/
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...)
{
qt8bps_context_t *hc = (qt8bps_context_t *) sh->context; // Decoder context
if (cmd == VDCTRL_QUERY_FORMAT)
switch (hc->planes) {
case 1:
if (*((int*)arg) == IMGFMT_BGR8)
return CONTROL_TRUE;
else
return CONTROL_FALSE;
break;
case 3:
case 4:
if ((*((int*)arg) == IMGFMT_BGR24) || (*((int*)arg) == IMGFMT_BGR32))
return CONTROL_TRUE;
else
return CONTROL_FALSE;
break;
default:
return CONTROL_FALSE;
}
return CONTROL_UNKNOWN;
}
/*
*
* Init 8BPS decoder
*
*/
static int init(sh_video_t *sh)
{
int vo_ret; // Video output init ret value
qt8bps_context_t *hc; // Decoder context
BITMAPINFOHEADER *bih = sh->bih;
if ((hc = malloc(sizeof(qt8bps_context_t))) == NULL) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "Can't allocate memory for 8BPS decoder context.\n");
return 0;
}
sh->context = (void *)hc;
hc->palette = NULL;
switch (bih->biBitCount) {
case 8:
hc->planes = 1;
hc->planemap[0] = 0; // 1st plane is palette indexes
if (bih->biSize > sizeof(BITMAPINFOHEADER)) {
hc->palette = (unsigned char *)malloc(256*4);
memcpy(hc->palette, (unsigned char*)bih + sizeof(BITMAPINFOHEADER), 256*4);
}
break;
case 24:
hc->planes = 3;
hc->planemap[0] = 2; // 1st plane is red
hc->planemap[1] = 1; // 2nd plane is green
hc->planemap[2] = 0; // 3rd plane is blue
break;
case 32:
hc->planes = 4;
hc->planemap[0] = 2; // 1st plane is red
hc->planemap[1] = 1; // 2nd plane is green
hc->planemap[2] = 0; // 3rd plane is blue
hc->planemap[3] = 3; // 4th plane is alpha???
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "[8BPS] Ignoring 4th (alpha?) plane.\n");
break;
default:
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "[8BPS] Unsupported color depth: %u.\n", bih->biBitCount);
return 0;
}
/*
* Initialize video output device
*/
vo_ret = mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_BGR24);
return vo_ret;
}
/*
*
* Uninit 8BPS decoder
*
*/
static void uninit(sh_video_t *sh)
{
qt8bps_context_t *hc = (qt8bps_context_t *) sh->context; // Decoder context
if (sh->context) {
if (hc->palette)
free (hc->palette);
free(sh->context);
}
}
/*
*
* Decode a frame
*
*/
static mp_image_t* decode(sh_video_t *sh,void* data,int len,int flags)
{
mp_image_t* mpi;
unsigned char *encoded = (unsigned char *)data;
qt8bps_context_t *hc = (qt8bps_context_t *) sh->context; // Decoder context
unsigned char *outptr, *pixptr;
unsigned int height = sh->disp_h; // Real image height
unsigned int dlen, p, row;
unsigned char *lp, *dp;
unsigned char count;
unsigned int px_inc;
unsigned int planes = hc->planes;
unsigned char *planemap = hc->planemap;
// Skipped frame
if(len <= 0)
return NULL;
/* Get output image buffer */
mpi=mpcodecs_get_image(sh, MP_IMGTYPE_STATIC, MP_IMGFLAG_ACCEPT_STRIDE, sh->disp_w, sh->disp_h);
if (!mpi) {
mp_msg(MSGT_DECVIDEO, MSGL_ERR, "Can't allocate mpi image for 8BPS codec.\n");
return NULL;
}
outptr = mpi->planes[0]; // Output image pointer
px_inc = mpi->bpp/8;
/* Set data pointer after line lengths */
dp = encoded + hc->planes*(height << 1);
/* Ignore alpha plane, don't know what to do with it */
if (planes == 4)
planes--;
for (p = 0; p < planes; p++) {
/* Lines length pointer for this plane */
lp = encoded + p*(height << 1);
/* Decode a plane */
for(row = 0; row < height; row++) {
pixptr = outptr + row * mpi->stride[0] + planemap[p];
dlen = be2me_16(*(unsigned short *)(lp+row*2));
/* Decode a row of this plane */
while(dlen > 0) {
if ((count = *dp++) <= 127) {
count++;
dlen -= count + 1;
while(count--) {
*pixptr = *dp++;
pixptr += px_inc;
}
} else {
count = 257 - count;
while(count--) {
*pixptr = *dp;
pixptr += px_inc;
}
dp++;
dlen -= 2;
}
}
}
}
if (hc->palette)
mpi->planes[1] = hc->palette;
return mpi;
}
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