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/*
*
* Apple Video (rpza) QuickTime Decoder for Mplayer
* (c) 2002 Roberto Togni
*
* Fourcc: rpza, azpr
*
* Some code comes from qtsmc.c by Mike Melanson
*
* A description of the decoding algorithm can be found here:
* http://www.pcisys.net/~melanson/codecs/
*/
#include "config.h"
#include "bswap.h"
#include "mp_msg.h"
#define BE_16(x) (be2me_16(*(unsigned short *)(x)))
#define BE_32(x) (be2me_32(*(unsigned int *)(x)))
#define ADVANCE_BLOCK() \
{ \
pixel_ptr += block_x_inc; \
if (pixel_ptr >= (width * bytes_per_pixel)) \
{ \
pixel_ptr = 0; \
row_ptr += block_y_inc * 4; \
} \
total_blocks--; \
if (total_blocks < 0) \
{ \
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "block counter just went negative (this should not happen)\n"); \
return; \
} \
}
#define PAINT_CURRENT_PIXEL(r, g, b, color) \
{ \
if (bytes_per_pixel == 2) { \
(*(unsigned short*)(&decoded[block_ptr])) = color & 0x7fff; \
block_ptr += 2; \
} else { \
decoded[block_ptr++] = (b); \
decoded[block_ptr++] = (g); \
decoded[block_ptr++] = (r); \
if (bytes_per_pixel == 4) /* 32bpp */ \
block_ptr++; \
} \
}
#define COLOR_FIX(col_out, col_in) (col_out) = ((col_in) << 3) | ((col_in) >> 2)
#define COLOR_TO_RGB(r, g, b, color) \
{ \
if (bytes_per_pixel != 2) { \
unsigned short tmp; \
tmp = (color >> 10) & 0x1f; \
COLOR_FIX (r, tmp); \
tmp = (color >> 5) & 0x1f; \
COLOR_FIX (g, tmp); \
tmp = color & 0x1f; \
COLOR_FIX (b, tmp); \
} \
}
#define COLORAB_TO_RGB4(rgb4, color4, colorA, colorB) \
{ \
unsigned short ta, tb, tt; \
if (bytes_per_pixel != 2) { \
ta = (colorA >> 10) & 0x1f; \
tb = (colorB >> 10) & 0x1f; \
COLOR_FIX (rgb4[3][0], ta); \
COLOR_FIX (rgb4[0][0], tb); \
tt = (11 * ta + 21 * tb) >> 5; \
COLOR_FIX (rgb4[1][0], tt); \
tt = (21 * ta + 11 * tb) >> 5; \
COLOR_FIX (rgb4[2][0], tt); \
ta = (colorA >> 5) & 0x1f; \
tb = (colorB >> 5) & 0x1f; \
COLOR_FIX (rgb4[3][1], ta); \
COLOR_FIX (rgb4[0][1], tb); \
tt = (11 * ta + 21 * tb) >> 5; \
COLOR_FIX (rgb4[1][1], tt); \
tt = (21 * ta + 11 * tb) >> 5; \
COLOR_FIX (rgb4[2][1], tt); \
ta = colorA & 0x1f; \
tb = colorB & 0x1f; \
COLOR_FIX (rgb4[3][2], ta); \
COLOR_FIX (rgb4[0][2], tb); \
tt = (11 * ta + 21 * tb) >> 5; \
COLOR_FIX (rgb4[1][2], tt); \
tt = (21 * ta + 11 * tb) >> 5; \
COLOR_FIX (rgb4[2][2], tt); \
} else { \
color4[3] = colorA; \
color4[0] = colorB; \
ta = (colorA >> 10) & 0x1f; \
tb = (colorB >> 10) & 0x1f; \
color4[1] = ((11 * ta + 21 * tb) << 5) & 0x7c00; \
color4[2] = ((21 * ta + 11 * tb) << 5) & 0x7c00; \
ta = (colorA >> 5) & 0x1f; \
tb = (colorB >> 5) & 0x1f; \
color4[1] |= (11 * ta + 21 * tb) & 0x3e0; \
color4[2] |= (21 * ta + 11 * tb) & 0x3e0; \
ta = colorA & 0x1f; \
tb = colorB & 0x1f; \
color4[1] |= (11 * ta + 21 * tb) >> 5; \
color4[2] |= (21 * ta + 11 * tb) >> 5; \
} \
}
/*
* rpza frame decoder
*
* Input values:
*
* *encoded: buffer of encoded data (chunk)
* encoded_size: length of encoded buffer
* *decoded: buffer where decoded data is written (image buffer)
* width: width of decoded frame in pixels
* height: height of decoded frame in pixels
* bytes_per_pixel: bytes/pixel in output image (color depth)
*
*/
void qt_decode_rpza(char *encoded, int encoded_size, char *decoded, int width,
int height, int bytes_per_pixel)
{
int i;
int stream_ptr = 0;
int chunk_size;
unsigned char opcode;
int n_blocks;
unsigned short colorA, colorB;
unsigned char r, g, b;
unsigned char rgb4[4][3];
unsigned short color4[4];
unsigned char index, idx;
int row_ptr = 0;
int pixel_ptr = 0;
int pixel_x, pixel_y;
int row_inc = bytes_per_pixel * (width - 4);
int max_height = row_inc * height;
int block_x_inc = bytes_per_pixel * 4;
int block_y_inc = bytes_per_pixel * width;
int block_ptr;
int total_blocks;
/* First byte is always 0xe1. Warn if it's different */
if ((unsigned char)encoded[stream_ptr] != 0xe1)
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"First chunk byte is 0x%02x instead of 0x1e\n",
(unsigned char)encoded[stream_ptr]);
/* Get chunk size, ingnoring first byte */
chunk_size = BE_32(&encoded[stream_ptr]) & 0x00FFFFFF;
stream_ptr += 4;
/* If length mismatch use size from MOV file and try to decode anyway */
if (chunk_size != encoded_size)
mp_msg(MSGT_DECVIDEO, MSGL_WARN, "MOV chunk size != encoded chunk size; using MOV chunk size\n");
chunk_size = encoded_size;
/* Number of 4x4 blocks in frame. */
total_blocks = (width * height) / (4 * 4);
/* Process chunk data */
while (stream_ptr < chunk_size) {
opcode = encoded[stream_ptr++]; /* Get opcode */
n_blocks = (opcode & 0x1f) +1; /* Extract block counter from opcode */
/* If opcode MSbit is 0, we need more data to decide what to do */
if ((opcode & 0x80) == 0) {
colorA = (opcode << 8) | ((unsigned char)encoded[stream_ptr++]);
opcode = 0;
if ((encoded[stream_ptr] & 0x80) != 0) {
/* Must behave as opcode 110xxxxx, using colorA computed above.*/
/* Use fake opcode 0x20 to enter switch block at the right place */
opcode = 0x20;
n_blocks = 1;
}
}
switch (opcode & 0xe0) {
/* Skip blocks */
case 0x80:
while (n_blocks--)
ADVANCE_BLOCK();
break;
/* Fill blocks with one color */
case 0xa0:
colorA = BE_16 (&encoded[stream_ptr]);
stream_ptr += 2;
COLOR_TO_RGB (r, g, b, colorA);
while (n_blocks--) {
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
for (pixel_x = 0; pixel_x < 4; pixel_x++){
PAINT_CURRENT_PIXEL(r, g, b, colorA);
}
block_ptr += row_inc;
}
ADVANCE_BLOCK();
}
break;
/* Fill blocks with 4 colors */
case 0xc0:
colorA = BE_16 (&encoded[stream_ptr]);
stream_ptr += 2;
case 0x20:
colorB = BE_16 (&encoded[stream_ptr]);
stream_ptr += 2;
COLORAB_TO_RGB4 (rgb4, color4, colorA, colorB);
while (n_blocks--) {
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
index = encoded[stream_ptr++];
for (pixel_x = 0; pixel_x < 4; pixel_x++){
idx = (index >> (2 * (3 - pixel_x))) & 0x03;
PAINT_CURRENT_PIXEL(rgb4[idx][0], rgb4[idx][1], rgb4[idx][2], color4[idx]);
}
block_ptr += row_inc;
}
ADVANCE_BLOCK();
}
break;
/* Fill block with 16 colors */
case 0x00:
block_ptr = row_ptr + pixel_ptr;
for (pixel_y = 0; pixel_y < 4; pixel_y++) {
for (pixel_x = 0; pixel_x < 4; pixel_x++){
/* We already have color of upper left pixel */
if ((pixel_y != 0) || (pixel_x !=0)) {
colorA = BE_16 (&encoded[stream_ptr]);
stream_ptr += 2;
}
COLOR_TO_RGB (r, g, b, colorA);
PAINT_CURRENT_PIXEL(r, g, b, colorA);
}
block_ptr += row_inc;
}
ADVANCE_BLOCK();
break;
/* Unknown opcode */
default:
mp_msg(MSGT_DECVIDEO, MSGL_HINT, "Unknown opcode %d in rpza chunk."
" Skip remaining %lu bytes of chunk data.\n", opcode,
chunk_size - stream_ptr);
return;
} /* Opcode switch */
}
}
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