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mpv/libmpcodecs/native/fli.c
arpi f0b5c4094b memset and memcpy were used without #include <string.h> in a few places. 
patch by Björn Sandell <biorn@dce.chalmers.se>


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@6132 b3059339-0415-0410-9bf9-f77b7e298cf2
2002-05-20 00:06:29 +00:00

381 lines
12 KiB
C
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/*
FLI Decoder for MPlayer
(C) 2001 Mike Melanson
32bpp support (c) alex
Additional code and bug fixes by Roberto Togni
For information on the FLI format, as well as various traps to
avoid while programming one, visit:
http://www.pcisys.net/~melanson/codecs/
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "config.h"
#include "bswap.h"
#include "mp_msg.h"
#define LE_16(x) (le2me_16(*(unsigned short *)(x)))
#define LE_32(x) (le2me_32(*(unsigned int *)(x)))
#define FLI_256_COLOR 4
#define FLI_DELTA 7
#define FLI_COLOR 11
#define FLI_LC 12
#define FLI_BLACK 13
#define FLI_BRUN 15
#define FLI_COPY 16
#define FLI_MINI 18
// 256 RGB entries; 25% of these bytes will be unused, but it's faster
// to index 4-byte entries
#define PALETTE_SIZE 1024
static unsigned char palette[PALETTE_SIZE];
void *init_fli_decoder(int width, int height)
{
memset(palette, 0, PALETTE_SIZE);
return malloc(width * height * sizeof (unsigned char));
}
void decode_fli_frame(
unsigned char *encoded,
int encoded_size,
unsigned char *decoded,
int width,
int height,
int bytes_per_pixel,
void *context)
{
int stream_ptr = 0;
int stream_ptr_after_color_chunk;
int pixel_ptr;
int palette_ptr1;
int palette_ptr2;
unsigned char palette_idx1;
unsigned char palette_idx2;
unsigned int frame_size;
int num_chunks;
unsigned int chunk_size;
int chunk_type;
int i, j;
int color_packets;
int color_changes;
int color_scale;
int lines;
int compressed_lines;
int starting_line;
signed short line_packets;
int y_ptr;
int line_inc = width * bytes_per_pixel;
signed char byte_run;
int pixel_skip;
int update_whole_frame = 0; // Palette change flag
unsigned char *fli_ghost_image = (unsigned char *)context;
int ghost_pixel_ptr;
int ghost_y_ptr;
frame_size = LE_32(&encoded[stream_ptr]);
stream_ptr += 6; // skip the magic number
num_chunks = LE_16(&encoded[stream_ptr]);
stream_ptr += 10; // skip padding
// iterate through the chunks
frame_size -= 16;
while ((frame_size > 0) && (num_chunks > 0))
{
chunk_size = LE_32(&encoded[stream_ptr]);
stream_ptr += 4;
chunk_type = LE_16(&encoded[stream_ptr]);
stream_ptr += 2;
switch (chunk_type)
{
case FLI_256_COLOR:
case FLI_COLOR:
stream_ptr_after_color_chunk = stream_ptr + chunk_size - 6;
if (chunk_type == FLI_COLOR)
color_scale = 4;
else
color_scale = 1;
// set up the palette
color_packets = LE_16(&encoded[stream_ptr]);
stream_ptr += 2;
palette_ptr1 = 0;
for (i = 0; i < color_packets; i++)
{
// first byte is how many colors to skip
palette_ptr1 += (encoded[stream_ptr++] * 4);
// wrap around, for good measure
if (palette_ptr1 >= PALETTE_SIZE)
palette_ptr1 = 0;
// next byte indicates how many entries to change
color_changes = encoded[stream_ptr++];
// if there are 0 color changes, there are actually 256
if (color_changes == 0)
color_changes = 256;
for (j = 0; j < color_changes; j++)
{
palette[palette_ptr1++] = encoded[stream_ptr + 2] * color_scale;
palette[palette_ptr1++] = encoded[stream_ptr + 1] * color_scale;
palette[palette_ptr1++] = encoded[stream_ptr + 0] * color_scale;
palette_ptr1++;
stream_ptr += 3;
}
}
// color chunks sometimes have weird 16-bit alignment issues;
// therefore, take the hardline approach and set the stream_ptr
// to the value calculate w.r.t. the size specified by the color
// chunk header
stream_ptr = stream_ptr_after_color_chunk;
/* Palette has changed, must update frame */
update_whole_frame = 1;
break;
case FLI_DELTA:
y_ptr = ghost_y_ptr = 0;
compressed_lines = LE_16(&encoded[stream_ptr]);
stream_ptr += 2;
while (compressed_lines > 0)
{
line_packets = LE_16(&encoded[stream_ptr]);
stream_ptr += 2;
if (line_packets < 0)
{
line_packets = -line_packets;
y_ptr += (line_packets * line_inc);
ghost_y_ptr += (line_packets * width);
}
else
{
pixel_ptr = y_ptr;
ghost_pixel_ptr = ghost_y_ptr;
for (i = 0; i < line_packets; i++)
{
// account for the skip bytes
pixel_skip = encoded[stream_ptr++];
pixel_ptr += pixel_skip * bytes_per_pixel;
ghost_pixel_ptr += pixel_skip;
byte_run = encoded[stream_ptr++];
if (byte_run < 0)
{
byte_run = -byte_run;
palette_ptr1 = (palette_idx1 = encoded[stream_ptr++]) * 4;
palette_ptr2 = (palette_idx2 = encoded[stream_ptr++]) * 4;
for (j = 0; j < byte_run; j++)
{
fli_ghost_image[ghost_pixel_ptr++] = palette_idx1;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
fli_ghost_image[ghost_pixel_ptr++] = palette_idx2;
decoded[pixel_ptr++] = palette[palette_ptr2 + 0];
decoded[pixel_ptr++] = palette[palette_ptr2 + 1];
decoded[pixel_ptr++] = palette[palette_ptr2 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
else
{
for (j = 0; j < byte_run * 2; j++)
{
palette_ptr1 = (palette_idx1 = encoded[stream_ptr++]) * 4;
fli_ghost_image[ghost_pixel_ptr++] = palette_idx1;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
}
y_ptr += line_inc;
ghost_y_ptr += width;
compressed_lines--;
}
}
break;
case FLI_LC:
// line compressed
starting_line = LE_16(&encoded[stream_ptr]);
stream_ptr += 2;
y_ptr = starting_line * line_inc;
ghost_y_ptr = starting_line * width;
compressed_lines = LE_16(&encoded[stream_ptr]);
stream_ptr += 2;
while (compressed_lines > 0)
{
pixel_ptr = y_ptr;
ghost_pixel_ptr = ghost_y_ptr;
line_packets = encoded[stream_ptr++];
if (line_packets > 0)
{
for (i = 0; i < line_packets; i++)
{
// account for the skip bytes
pixel_skip = encoded[stream_ptr++];
pixel_ptr += pixel_skip * bytes_per_pixel;
ghost_pixel_ptr += pixel_skip;
byte_run = encoded[stream_ptr++];
if (byte_run > 0)
{
for (j = 0; j < byte_run; j++)
{
palette_ptr1 = (palette_idx1 = encoded[stream_ptr++]) * 4;
fli_ghost_image[ghost_pixel_ptr++] = palette_idx1;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
else
{
byte_run = -byte_run;
palette_ptr1 = (palette_idx1 = encoded[stream_ptr++]) * 4;
for (j = 0; j < byte_run; j++)
{
fli_ghost_image[ghost_pixel_ptr++] = palette_idx1;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
}
}
y_ptr += line_inc;
ghost_y_ptr += width;
compressed_lines--;
}
break;
case FLI_BLACK:
// set the whole frame to color 0 (which is usually black) by
// clearing the ghost image and trigger a full frame update
memset(fli_ghost_image, 0, width * height * sizeof(unsigned char));
update_whole_frame = 1;
break;
case FLI_BRUN:
// byte run compression
y_ptr = 0;
ghost_y_ptr = 0;
for (lines = 0; lines < height; lines++)
{
pixel_ptr = y_ptr;
ghost_pixel_ptr = ghost_y_ptr;
line_packets = encoded[stream_ptr++];
for (i = 0; i < line_packets; i++)
{
byte_run = encoded[stream_ptr++];
if (byte_run > 0)
{
palette_ptr1 = (palette_idx1 = encoded[stream_ptr++]) * 4;
for (j = 0; j < byte_run; j++)
{
fli_ghost_image[ghost_pixel_ptr++] = palette_idx1;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
else // copy bytes if byte_run < 0
{
byte_run = -byte_run;
for (j = 0; j < byte_run; j++)
{
palette_ptr1 = (palette_idx1 = encoded[stream_ptr++]) * 4;
fli_ghost_image[ghost_pixel_ptr++] = palette_idx1;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
}
y_ptr += line_inc;
ghost_y_ptr += width;
}
break;
case FLI_COPY:
// copy the chunk (uncompressed frame) to the ghost image and
// schedule the whole frame to be updated
if (chunk_size - 6 > width * height)
{
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
"FLI: in chunk FLI_COPY : source data (%d bytes) bigger than image," \
" skipping chunk\n",
chunk_size - 6);
break;
}
else
memcpy(fli_ghost_image, &encoded[stream_ptr], chunk_size - 6);
stream_ptr += chunk_size - 6;
update_whole_frame = 1;
break;
case FLI_MINI:
// sort of a thumbnail? disregard this chunk...
stream_ptr += chunk_size - 6;
break;
default:
mp_msg (MSGT_DECVIDEO, MSGL_WARN,
"FLI: Unrecognized chunk type: %d\n", chunk_type);
break;
}
frame_size -= chunk_size;
num_chunks--;
}
if (update_whole_frame)
{
pixel_ptr = ghost_pixel_ptr = 0;
while (pixel_ptr < (width * height * bytes_per_pixel))
{
palette_ptr1 = fli_ghost_image[ghost_pixel_ptr++] * 4;
decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
if (bytes_per_pixel == 4) /* 32bpp */
pixel_ptr++;
}
}
// by the end of the chunk, the stream ptr should equal the frame
// size (minus 1, possibly); if it doesn't, issue a warning
if ((stream_ptr != encoded_size) && (stream_ptr != encoded_size - 1))
mp_msg(MSGT_DECVIDEO, MSGL_WARN,
" warning: processed FLI chunk where encoded size = %d\n" \
" and final chunk ptr = %d\n",
encoded_size, stream_ptr);
}
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