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#include <stdio.h>
#include <stdlib.h>
#include "config.h"
#include "mp_msg.h"
#include "vd_internal.h"
static vd_info_t info = {
"Microsoft RLE decoder",
"msrle",
"Mike Melanson",
"Mike Melanson",
"native codec"
};
LIBVD_EXTERN(msrle)
// to set/get/query special features/parameters
static int control(sh_video_t *sh,int cmd,void* arg,...){
return CONTROL_UNKNOWN;
}
// init driver
static int init(sh_video_t *sh){
unsigned char *palette_map = NULL;
unsigned char *orig_map = (unsigned char *)sh->bih+40;
int i;
unsigned short color;
unsigned char r, g, b;
int bits_per_pixel = sh->codec->outfmt[sh->outfmtidx] & 255;
// convert the palette for the requested output format
switch (bits_per_pixel)
{
case 15:
case 16:
if ((palette_map =
(unsigned char *)malloc(sh->bih->biClrUsed * 2)) == NULL)
return 0;
for (i = 0; i < sh->bih->biClrUsed; i++)
{
r = orig_map[i * 4 + 2];
g = orig_map[i * 4 + 1];
b = orig_map[i * 4 + 0];
if (bits_per_pixel == 15)
color = ((r>>3)<<10) | ((g>>3)<<5) | ((b>>3));
else
color = ((r>>3)<<11) | ((g>>2)<<5) | ((b>>3));
palette_map[i * 2 + 1] = color >> 8;
palette_map[i * 2 + 0] = color & 0xFF;
}
break;
case 24:
case 32:
if ((palette_map =
(unsigned char *)malloc(sh->bih->biClrUsed * 4)) == NULL)
return 0;
memcpy(palette_map, orig_map, sh->bih->biClrUsed * 4);
break;
}
sh->context = palette_map;
return mpcodecs_config_vo(sh,sh->disp_w,sh->disp_h,IMGFMT_BGR24);
}
// uninit driver
static void uninit(sh_video_t *sh){
unsigned char *palette_map = (unsigned char *)sh->context;
free(palette_map);
}
#define FETCH_NEXT_STREAM_BYTE() \
if (stream_ptr >= encoded_size) \
{ \
mp_msg(MSGT_DECVIDEO, MSGL_WARN, \
"MS RLE: stream ptr just went out of bounds (1)\n"); \
return; \
} \
stream_byte = encoded[stream_ptr++];
void decode_msrle4(
unsigned char *encoded,
int encoded_size,
unsigned char *decoded,
int width,
int height,
unsigned char *palette_map,
int bits_per_pixel)
{
int bytes_per_pixel = (bits_per_pixel + 1) / 8;
unsigned char r1, g1, b1; // for 24/32 bpp
unsigned char r2, g2, b2;
unsigned char color_hi1, color_lo1; // for 15/16 bpp
unsigned char color_hi2, color_lo2;
int stream_ptr = 0;
unsigned char rle_code;
unsigned char extra_byte;
unsigned char stream_byte;
int frame_size = width * height * bytes_per_pixel;
int pixel_ptr = 0;
int row_dec = width * bytes_per_pixel;
int row_ptr = (height - 1) * row_dec;
int i;
r1 = r2 = g1 = g2 = b1 = b2 =
color_hi1 = color_hi2 = color_lo1 = color_lo2 = 0;
while (row_ptr >= 0)
{
FETCH_NEXT_STREAM_BYTE();
rle_code = stream_byte;
if (rle_code == 0)
{
// fetch the next byte to see how to handle escape code
FETCH_NEXT_STREAM_BYTE();
if (stream_byte == 0)
{
// line is done, goto the next one
row_ptr -= row_dec;
pixel_ptr = 0;
}
else if (stream_byte == 1)
// decode is done
return;
else if (stream_byte == 2)
{
// reposition frame decode coordinates
FETCH_NEXT_STREAM_BYTE();
pixel_ptr += stream_byte * bytes_per_pixel;
FETCH_NEXT_STREAM_BYTE();
row_ptr -= stream_byte * row_dec;
}
else
{
// copy pixels from encoded stream
rle_code = ((stream_byte + 1) & (~1)) / 2;
extra_byte = rle_code & 0x01;
if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
(row_ptr < 0))
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
for (i = 0; i < rle_code; i++)
{
if (pixel_ptr >= row_dec)
break;
if (bytes_per_pixel == 2)
{
color_hi1 = palette_map[(encoded[stream_ptr + i] >> 4) * 2 + 0];
color_lo1 = palette_map[(encoded[stream_ptr + i] >> 4) * 2 + 1];
decoded[row_ptr + pixel_ptr + 0] = color_hi1;
decoded[row_ptr + pixel_ptr + 1] = color_lo1;
}
else
{
r1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 2];
g1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 1];
b1 = palette_map[(encoded[stream_ptr + i] >> 4) * 4 + 0];
decoded[row_ptr + pixel_ptr + 0] = b1;
decoded[row_ptr + pixel_ptr + 1] = g1;
decoded[row_ptr + pixel_ptr + 2] = r1;
}
pixel_ptr += bytes_per_pixel;
if (i + 1 == rle_code && (stream_byte & 1) != 0)
break;
if (pixel_ptr >= row_dec)
break;
if (bytes_per_pixel == 2)
{
color_hi1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 2 + 0];
color_lo1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 2 + 1];
decoded[row_ptr + pixel_ptr + 0] = color_hi1;
decoded[row_ptr + pixel_ptr + 1] = color_lo1;
}
else
{
r1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 2];
g1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 1];
b1 = palette_map[(encoded[stream_ptr + i] & 0x0F) * 4 + 0];
decoded[row_ptr + pixel_ptr + 0] = b1;
decoded[row_ptr + pixel_ptr + 1] = g1;
decoded[row_ptr + pixel_ptr + 2] = r1;
}
pixel_ptr += bytes_per_pixel;
}
stream_ptr += rle_code;
// if the RLE code is odd, skip a byte in the stream
if (extra_byte)
stream_ptr++;
}
}
else
{
// decode a run of data
FETCH_NEXT_STREAM_BYTE();
if (bytes_per_pixel == 2)
{
color_hi1 = palette_map[(stream_byte >> 4) * 2 + 0];
color_lo1 = palette_map[(stream_byte >> 4) * 2 + 1];
color_hi2 = palette_map[(stream_byte & 0x0F) * 2 + 0];
color_lo2 = palette_map[(stream_byte & 0x0F) * 2 + 1];
}
else
{
r1 = palette_map[(stream_byte >> 4) * 4 + 2];
g1 = palette_map[(stream_byte >> 4) * 4 + 1];
b1 = palette_map[(stream_byte >> 4) * 4 + 0];
r2 = palette_map[(stream_byte & 0x0F) * 4 + 2];
g2 = palette_map[(stream_byte & 0x0F) * 4 + 1];
b2 = palette_map[(stream_byte & 0x0F) * 4 + 0];
}
for (i = 0; i < rle_code; i++)
{
if (pixel_ptr >= row_dec)
break;
if ((i & 1) == 0)
{
if (bytes_per_pixel == 2)
{
decoded[row_ptr + pixel_ptr + 0] = color_hi1;
decoded[row_ptr + pixel_ptr + 1] = color_lo1;
}
else
{
decoded[row_ptr + pixel_ptr + 0] = b1;
decoded[row_ptr + pixel_ptr + 1] = g1;
decoded[row_ptr + pixel_ptr + 2] = r1;
}
}
else
{
if (bytes_per_pixel == 2)
{
decoded[row_ptr + pixel_ptr + 0] = color_hi2;
decoded[row_ptr + pixel_ptr + 1] = color_lo2;
}
else
{
decoded[row_ptr + pixel_ptr + 0] = b2;
decoded[row_ptr + pixel_ptr + 1] = g2;
decoded[row_ptr + pixel_ptr + 2] = r2;
}
}
pixel_ptr += bytes_per_pixel;
}
}
}
// one last sanity check on the way out
if (stream_ptr < encoded_size)
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, encoded_size);
}
void decode_msrle8(
unsigned char *encoded,
int encoded_size,
unsigned char *decoded,
int width,
int height,
unsigned char *palette_map,
int bits_per_pixel)
{
int bytes_per_pixel = (bits_per_pixel + 1) / 8;
unsigned char r, g, b; // for 24/32 bpp
unsigned char color_hi, color_lo; // for 15/16 bpp
int stream_ptr = 0;
unsigned char rle_code;
unsigned char extra_byte;
unsigned char stream_byte;
int frame_size = width * height * bytes_per_pixel;
int pixel_ptr = 0;
int row_dec = width * bytes_per_pixel;
int row_ptr = (height - 1) * row_dec;
r = g = b = color_hi = color_lo = 0;
while (row_ptr >= 0)
{
FETCH_NEXT_STREAM_BYTE();
rle_code = stream_byte;
if (rle_code == 0)
{
// fetch the next byte to see how to handle escape code
FETCH_NEXT_STREAM_BYTE();
if (stream_byte == 0)
{
// line is done, goto the next one
row_ptr -= row_dec;
pixel_ptr = 0;
}
else if (stream_byte == 1)
// decode is done
return;
else if (stream_byte == 2)
{
// reposition frame decode coordinates
FETCH_NEXT_STREAM_BYTE();
pixel_ptr += stream_byte * bytes_per_pixel;
FETCH_NEXT_STREAM_BYTE();
row_ptr -= stream_byte * row_dec;
}
else
{
// copy pixels from encoded stream
if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
(row_ptr < 0))
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: frame ptr just went out of bounds (1)\n");
return;
}
rle_code = stream_byte;
extra_byte = stream_byte & 0x01;
if (stream_ptr + rle_code + extra_byte > encoded_size)
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: stream ptr just went out of bounds (2)\n");
return;
}
while (rle_code--)
{
FETCH_NEXT_STREAM_BYTE();
if (bytes_per_pixel == 2)
{
color_hi = palette_map[stream_byte * 2 + 0];
color_lo = palette_map[stream_byte * 2 + 1];
decoded[row_ptr + pixel_ptr + 0] = color_hi;
decoded[row_ptr + pixel_ptr + 1] = color_lo;
}
else
{
r = palette_map[stream_byte * 4 + 2];
g = palette_map[stream_byte * 4 + 1];
b = palette_map[stream_byte * 4 + 0];
decoded[row_ptr + pixel_ptr + 0] = b;
decoded[row_ptr + pixel_ptr + 1] = g;
decoded[row_ptr + pixel_ptr + 2] = r;
}
pixel_ptr += bytes_per_pixel;
}
// if the RLE code is odd, skip a byte in the stream
if (extra_byte)
stream_ptr++;
}
}
else
{
// decode a run of data
if ((row_ptr + pixel_ptr + stream_byte * bytes_per_pixel > frame_size) ||
(row_ptr < 0))
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: frame ptr just went out of bounds (2)\n");
return;
}
FETCH_NEXT_STREAM_BYTE();
if (bytes_per_pixel == 2)
{
color_hi = palette_map[stream_byte * 2 + 0];
color_lo = palette_map[stream_byte * 2 + 1];
}
else
{
r = palette_map[stream_byte * 4 + 2];
g = palette_map[stream_byte * 4 + 1];
b = palette_map[stream_byte * 4 + 0];
}
while(rle_code--)
{
if (bytes_per_pixel == 2)
{
decoded[row_ptr + pixel_ptr + 0] = color_hi;
decoded[row_ptr + pixel_ptr + 1] = color_lo;
}
else
{
decoded[row_ptr + pixel_ptr + 0] = b;
decoded[row_ptr + pixel_ptr + 1] = g;
decoded[row_ptr + pixel_ptr + 2] = r;
}
pixel_ptr += bytes_per_pixel;
}
}
}
// one last sanity check on the way out
if (stream_ptr < encoded_size)
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: ended frame decode with bytes left over (%d < %d)\n",
stream_ptr, encoded_size);
}
// 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
mpi=mpcodecs_get_image(sh, MP_IMGTYPE_STATIC, MP_IMGFLAG_PRESERVE,
sh->disp_w, sh->disp_h);
if(!mpi) return NULL;
if (sh->format == 1)
decode_msrle8(
data,len, mpi->planes[0],
sh->disp_w, sh->disp_h,
(unsigned char *)sh->context,
mpi->imgfmt & 255);
else if (sh->format == 2)
decode_msrle4(
data,len, mpi->planes[0],
sh->disp_w, sh->disp_h,
(unsigned char *)sh->context,
mpi->imgfmt & 255);
else
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"MS RLE: Don't know how to decode format %08X", sh->format);
return mpi;
}
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