FFmpeg
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Xan video decoder for Wing Commander III computer game by Mario Brito (mbrit) and Mike Melanson ( o@st udent .dei .uc.p tmelan) son@ pcisy s.ne tMore...
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "libavutil/intreadwrite.h"
#include "libavutil/mem.h"
#include "avcodec.h"
#include "bytestream.h"
#include "get_bits.h"
#include "internal.h"
Go to the source code of this file.
Data Structures | |
struct | XanContext |
Macros | |
#define | BITSTREAM_READER_LE |
#define | RUNTIME_GAMMA 0 |
#define | VGA__TAG MKTAG('V', 'G', 'A', ' ') |
#define | PALT_TAG MKTAG('P', 'A', 'L', 'T') |
#define | SHOT_TAG MKTAG('S', 'H', 'O', 'T') |
#define | PALETTE_COUNT 256 |
#define | PALETTE_SIZE (PALETTE_COUNT * 3) |
#define | PALETTES_MAX 256 |
Functions | |
static av_cold int | xan_decode_init (AVCodecContext *avctx) |
static int | xan_huffman_decode (unsigned char *dest, int dest_len, const unsigned char *src, int src_len) |
static void | xan_unpack (unsigned char *dest, int dest_len, const unsigned char *src, int src_len) |
unpack simple compression | |
static void | xan_wc3_output_pixel_run (XanContext *s, const unsigned char *pixel_buffer, int x, int y, int pixel_count) |
static void | xan_wc3_copy_pixel_run (XanContext *s, int x, int y, int pixel_count, int motion_x, int motion_y) |
static int | xan_wc3_decode_frame (XanContext *s) |
static int | xan_decode_frame (AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt) |
static av_cold int | xan_decode_end (AVCodecContext *avctx) |
Variables | |
static const uint8_t | gamma_lookup [256] |
This is a gamma correction that xan3 applies to all palette entries. | |
AVCodec | ff_xan_wc3_decoder |
Xan video decoder for Wing Commander III computer game by Mario Brito (mbrit) and Mike Melanson ( o@st udent .dei .uc.p tmelan) son@ pcisy s.ne t
The xan_wc3 decoder outputs PAL8 data.
Definition in file xan.c.
Definition at line 45 of file xan.c.
Referenced by xan_decode_frame().
Definition at line 46 of file xan.c.
Referenced by xan_decode_frame().
Definition at line 47 of file xan.c.
Referenced by xan_decode_frame().
#define PALETTE_COUNT 256 |
Definition at line 48 of file xan.c.
Referenced by xan_decode_frame().
#define PALETTE_SIZE (PALETTE_COUNT * 3) |
Definition at line 49 of file xan.c.
Referenced by xan_decode_frame().
#define PALETTES_MAX 256 |
Definition at line 50 of file xan.c.
Referenced by xan_decode_frame().
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Definition at line 100 of file xan.c.
Referenced by xan_wc3_decode_frame().
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unpack simple compression
dest | destination buffer of dest_len, must be padded with at least 130 bytes |
Definition at line 138 of file xan.c.
Referenced by xan_wc3_decode_frame().
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inlinestatic |
Definition at line 192 of file xan.c.
Referenced by xan_wc3_decode_frame().
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inlinestatic |
Definition at line 222 of file xan.c.
Referenced by xan_wc3_decode_frame().
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Definition at line 273 of file xan.c.
Referenced by xan_decode_frame().
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This is a gamma correction that xan3 applies to all palette entries.
There is a peculiarity, namely that the values are clamped to 253 - it seems likely that this table was calculated by a buggy fixed-point implementation, the one above under RUNTIME_GAMMA behaves like this for example. The exponent value of 0.8 can be explained by this as well, since 0.8 = 4/5 and thus pow(x, 0.8) is still easy to calculate. Also, the input values are first rotated to the left by 2.
AVCodec ff_xan_wc3_decoder |