mirror of
https://github.com/mpv-player/mpv
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a54006e1cf
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3738 b3059339-0415-0410-9bf9-f77b7e298cf2
307 lines
8.6 KiB
C
307 lines
8.6 KiB
C
/*
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FLI Decoder for MPlayer
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(C) 2001 Mike Melanson
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32bpp support (c) alex
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*/
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#include "config.h"
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#include "bswap.h"
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#include <stdio.h>
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#define LE_16(x) (le2me_16(*(unsigned short *)(x)))
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#define LE_32(x) (le2me_32(*(unsigned int *)(x)))
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#define FLI_256_COLOR 4
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#define FLI_DELTA 7
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#define FLI_COLOR 11
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#define FLI_LC 12
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#define FLI_BLACK 13
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#define FLI_BRUN 15
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#define FLI_COPY 16
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#define FLI_MINI 18
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// 256 RGB entries; 25% of these bytes will be unused, but it's faster
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// to index 4-byte entries
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static unsigned char palette[256 * 4];
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void Decode_Fli(
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unsigned char *encoded,
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int encoded_size,
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unsigned char *decoded,
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int width,
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int height,
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int bytes_per_pixel)
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{
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int stream_ptr = 0;
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int pixel_ptr;
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int palette_ptr1;
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int palette_ptr2;
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unsigned int frame_size;
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int num_chunks;
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unsigned int chunk_size;
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int chunk_type;
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int i, j;
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int color_packets;
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int color_changes;
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int color_scale;
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int lines;
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int compressed_lines;
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int starting_line;
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signed short line_packets;
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int y_ptr;
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int line_inc;
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signed char byte_run;
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frame_size = LE_32(&encoded[stream_ptr]);
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stream_ptr += 6; // skip the magic number
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num_chunks = LE_16(&encoded[stream_ptr]);
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stream_ptr += 10; // skip padding
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// iterate through the chunks
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frame_size -= 16;
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while ((frame_size > 0) && (num_chunks > 0))
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{
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chunk_size = LE_32(&encoded[stream_ptr]);
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stream_ptr += 4;
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chunk_type = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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switch (chunk_type)
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{
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case FLI_256_COLOR:
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case FLI_COLOR:
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if (chunk_type == FLI_COLOR)
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color_scale = 4;
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else
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color_scale = 1;
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// set up the palette
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color_packets = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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palette_ptr1 = 0;
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for (i = 0; i < color_packets; i++)
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{
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// first byte is how many colors to skip
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palette_ptr1 += (encoded[stream_ptr++] * 4);
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// next byte indicates how many entries to change
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color_changes = encoded[stream_ptr++];
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// if there are 0 color changes, there are actually 256
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if (color_changes == 0)
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color_changes = 256;
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for (j = 0; j < color_changes; j++)
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{
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palette[palette_ptr1++] = encoded[stream_ptr + 2] * color_scale;
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palette[palette_ptr1++] = encoded[stream_ptr + 1] * color_scale;
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palette[palette_ptr1++] = encoded[stream_ptr + 0] * color_scale;
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palette_ptr1++;
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stream_ptr += 3;
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}
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}
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// it seems that a color packet has to be an even number of bytes
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// so account for a pad byte
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if (stream_ptr & 0x01)
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stream_ptr++;
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break;
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case FLI_DELTA:
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line_inc = width * bytes_per_pixel;
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y_ptr = 0;
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compressed_lines = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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while (compressed_lines > 0)
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{
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line_packets = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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if (line_packets < 0)
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{
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line_packets = -line_packets;
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y_ptr += (line_packets * line_inc);
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}
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else
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{
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pixel_ptr = y_ptr;
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for (i = 0; i < line_packets; i++)
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{
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// account for the skip bytes
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pixel_ptr += encoded[stream_ptr++] * bytes_per_pixel;
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byte_run = encoded[stream_ptr++];
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if (byte_run < 0)
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{
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byte_run = -byte_run;
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palette_ptr1 = encoded[stream_ptr++] * 4;
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palette_ptr2 = encoded[stream_ptr++] * 4;
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for (j = 0; j < byte_run; j++)
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{
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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decoded[pixel_ptr++] = palette[palette_ptr2 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr2 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr2 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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}
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else
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{
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for (j = 0; j < byte_run * 2; j++)
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{
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palette_ptr1 = encoded[stream_ptr++] * 4;
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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}
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}
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y_ptr += line_inc;
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compressed_lines--;
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}
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}
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break;
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case FLI_LC:
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// line compressed
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line_inc = width * bytes_per_pixel;
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starting_line = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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y_ptr = starting_line * line_inc;
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compressed_lines = LE_16(&encoded[stream_ptr]);
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stream_ptr += 2;
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while (compressed_lines > 0)
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{
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pixel_ptr = y_ptr;
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line_packets = encoded[stream_ptr++];
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if (line_packets > 0)
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{
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for (i = 0; i < line_packets; i++)
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{
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// account for the skip bytes
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pixel_ptr += encoded[stream_ptr++] * bytes_per_pixel;
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byte_run = encoded[stream_ptr++];
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if (byte_run > 0)
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{
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for (j = 0; j < byte_run; j++)
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{
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palette_ptr1 = encoded[stream_ptr++] * 4;
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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}
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else
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{
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byte_run = -byte_run;
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palette_ptr1 = encoded[stream_ptr++] * 4;
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for (j = 0; j < byte_run; j++)
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{
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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}
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}
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}
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y_ptr += line_inc;
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compressed_lines--;
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}
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break;
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case FLI_BLACK:
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// set the whole frame to color 0 (which is usually black)
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for (pixel_ptr = 0; pixel_ptr < (width * height * bytes_per_pixel); pixel_ptr++)
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{
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decoded[pixel_ptr++] = palette[0];
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decoded[pixel_ptr++] = palette[1];
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decoded[pixel_ptr++] = palette[2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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break;
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case FLI_BRUN:
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// byte run compression
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line_inc = width * bytes_per_pixel;
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y_ptr = 0;
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for (lines = 0; lines < height; lines++)
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{
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pixel_ptr = y_ptr;
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line_packets = encoded[stream_ptr++];
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for (i = 0; i < line_packets; i++)
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{
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byte_run = encoded[stream_ptr++];
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if (byte_run > 0)
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{
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palette_ptr1 = encoded[stream_ptr++] * 4;
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for (j = 0; j < byte_run; j++)
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{
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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}
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else // copy bytes if byte_run < 0
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{
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byte_run = -byte_run;
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for (j = 0; j < byte_run; j++)
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{
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palette_ptr1 = encoded[stream_ptr++] * 4;
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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}
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}
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y_ptr += line_inc;
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}
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break;
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case FLI_COPY:
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// copy the chunk (uncompressed frame)
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for (pixel_ptr = 0; pixel_ptr < chunk_size - 6; pixel_ptr++)
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{
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palette_ptr1 = encoded[stream_ptr++] * 4;
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decoded[pixel_ptr++] = palette[palette_ptr1 + 0];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 1];
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decoded[pixel_ptr++] = palette[palette_ptr1 + 2];
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if (bytes_per_pixel == 4) /* 32bpp */
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pixel_ptr++;
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}
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break;
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case FLI_MINI:
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// sort of a thumbnail? disregard this chunk...
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stream_ptr += chunk_size - 6;
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break;
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default:
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printf ("FLI: Unrecognized chunk type: %d\n", chunk_type);
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break;
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}
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frame_size -= chunk_size;
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num_chunks--;
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}
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}
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