mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 04:48:26 -05:00
653 lines
20 KiB
C
Executable File
653 lines
20 KiB
C
Executable File
/*
|
|
* Wing Commander/Xan Video Decoder
|
|
* Copyright (C) 2003 The FFmpeg project
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Xan video decoder for Wing Commander III computer game
|
|
* by Mario Brito (mbrito@student.dei.uc.pt)
|
|
* and Mike Melanson (melanson@pcisys.net)
|
|
*
|
|
* The xan_wc3 decoder outputs PAL8 data.
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/mem.h"
|
|
|
|
#define BITSTREAM_READER_LE
|
|
#include "avcodec.h"
|
|
#include "bytestream.h"
|
|
#include "get_bits.h"
|
|
#include "internal.h"
|
|
|
|
#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
|
|
|
|
typedef struct XanContext {
|
|
|
|
AVCodecContext *avctx;
|
|
AVFrame *last_frame;
|
|
|
|
const uint8_t *buf;
|
|
int size;
|
|
|
|
/* scratch space */
|
|
uint8_t *buffer1;
|
|
int buffer1_size;
|
|
uint8_t *buffer2;
|
|
int buffer2_size;
|
|
|
|
unsigned *palettes;
|
|
int palettes_count;
|
|
int cur_palette;
|
|
|
|
int frame_size;
|
|
|
|
} XanContext;
|
|
|
|
static av_cold int xan_decode_end(AVCodecContext *avctx)
|
|
{
|
|
XanContext *s = avctx->priv_data;
|
|
|
|
av_frame_free(&s->last_frame);
|
|
|
|
av_freep(&s->buffer1);
|
|
av_freep(&s->buffer2);
|
|
av_freep(&s->palettes);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold int xan_decode_init(AVCodecContext *avctx)
|
|
{
|
|
XanContext *s = avctx->priv_data;
|
|
|
|
s->avctx = avctx;
|
|
s->frame_size = 0;
|
|
|
|
avctx->pix_fmt = AV_PIX_FMT_PAL8;
|
|
|
|
s->buffer1_size = avctx->width * avctx->height;
|
|
s->buffer1 = av_malloc(s->buffer1_size);
|
|
if (!s->buffer1)
|
|
return AVERROR(ENOMEM);
|
|
s->buffer2_size = avctx->width * avctx->height;
|
|
s->buffer2 = av_malloc(s->buffer2_size + 130);
|
|
if (!s->buffer2) {
|
|
av_freep(&s->buffer1);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
s->last_frame = av_frame_alloc();
|
|
if (!s->last_frame) {
|
|
xan_decode_end(avctx);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xan_huffman_decode(uint8_t *dest, int dest_len,
|
|
const uint8_t *src, int src_len)
|
|
{
|
|
uint8_t byte = *src++;
|
|
uint8_t ival = byte + 0x16;
|
|
const uint8_t * ptr = src + byte*2;
|
|
int ptr_len = src_len - 1 - byte*2;
|
|
uint8_t val = ival;
|
|
uint8_t *dest_end = dest + dest_len;
|
|
uint8_t *dest_start = dest;
|
|
int ret;
|
|
GetBitContext gb;
|
|
|
|
if ((ret = init_get_bits8(&gb, ptr, ptr_len)) < 0)
|
|
return ret;
|
|
|
|
while (val != 0x16) {
|
|
unsigned idx;
|
|
if (get_bits_left(&gb) < 1)
|
|
return AVERROR_INVALIDDATA;
|
|
idx = val - 0x17 + get_bits1(&gb) * byte;
|
|
if (idx >= 2 * byte)
|
|
return AVERROR_INVALIDDATA;
|
|
val = src[idx];
|
|
|
|
if (val < 0x16) {
|
|
if (dest >= dest_end)
|
|
return dest_len;
|
|
*dest++ = val;
|
|
val = ival;
|
|
}
|
|
}
|
|
|
|
return dest - dest_start;
|
|
}
|
|
|
|
/**
|
|
* unpack simple compression
|
|
*
|
|
* @param dest destination buffer of dest_len, must be padded with at least 130 bytes
|
|
*/
|
|
static void xan_unpack(uint8_t *dest, int dest_len,
|
|
const uint8_t *src, int src_len)
|
|
{
|
|
uint8_t opcode;
|
|
int size;
|
|
uint8_t *dest_org = dest;
|
|
uint8_t *dest_end = dest + dest_len;
|
|
GetByteContext ctx;
|
|
|
|
bytestream2_init(&ctx, src, src_len);
|
|
while (dest < dest_end && bytestream2_get_bytes_left(&ctx)) {
|
|
opcode = bytestream2_get_byte(&ctx);
|
|
|
|
if (opcode < 0xe0) {
|
|
int size2, back;
|
|
if ((opcode & 0x80) == 0) {
|
|
size = opcode & 3;
|
|
|
|
back = ((opcode & 0x60) << 3) + bytestream2_get_byte(&ctx) + 1;
|
|
size2 = ((opcode & 0x1c) >> 2) + 3;
|
|
} else if ((opcode & 0x40) == 0) {
|
|
size = bytestream2_peek_byte(&ctx) >> 6;
|
|
|
|
back = (bytestream2_get_be16(&ctx) & 0x3fff) + 1;
|
|
size2 = (opcode & 0x3f) + 4;
|
|
} else {
|
|
size = opcode & 3;
|
|
|
|
back = ((opcode & 0x10) << 12) + bytestream2_get_be16(&ctx) + 1;
|
|
size2 = ((opcode & 0x0c) << 6) + bytestream2_get_byte(&ctx) + 5;
|
|
}
|
|
|
|
if (dest_end - dest < size + size2 ||
|
|
dest + size - dest_org < back ||
|
|
bytestream2_get_bytes_left(&ctx) < size)
|
|
return;
|
|
bytestream2_get_buffer(&ctx, dest, size);
|
|
dest += size;
|
|
av_memcpy_backptr(dest, back, size2);
|
|
dest += size2;
|
|
} else {
|
|
int finish = opcode >= 0xfc;
|
|
size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4;
|
|
|
|
if (dest_end - dest < size || bytestream2_get_bytes_left(&ctx) < size)
|
|
return;
|
|
bytestream2_get_buffer(&ctx, dest, size);
|
|
dest += size;
|
|
if (finish)
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void xan_wc3_output_pixel_run(XanContext *s, AVFrame *frame,
|
|
const uint8_t *pixel_buffer, int x, int y, int pixel_count)
|
|
{
|
|
int stride;
|
|
int line_inc;
|
|
int index;
|
|
int current_x;
|
|
int width = s->avctx->width;
|
|
uint8_t *palette_plane;
|
|
|
|
palette_plane = frame->data[0];
|
|
stride = frame->linesize[0];
|
|
line_inc = stride - width;
|
|
index = y * stride + x;
|
|
current_x = x;
|
|
while (pixel_count && index < s->frame_size) {
|
|
int count = FFMIN(pixel_count, width - current_x);
|
|
memcpy(palette_plane + index, pixel_buffer, count);
|
|
pixel_count -= count;
|
|
index += count;
|
|
pixel_buffer += count;
|
|
current_x += count;
|
|
|
|
if (current_x >= width) {
|
|
index += line_inc;
|
|
current_x = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline void xan_wc3_copy_pixel_run(XanContext *s, AVFrame *frame,
|
|
int x, int y,
|
|
int pixel_count, int motion_x,
|
|
int motion_y)
|
|
{
|
|
int stride;
|
|
int line_inc;
|
|
int curframe_index, prevframe_index;
|
|
int curframe_x, prevframe_x;
|
|
int width = s->avctx->width;
|
|
uint8_t *palette_plane, *prev_palette_plane;
|
|
|
|
if (y + motion_y < 0 || y + motion_y >= s->avctx->height ||
|
|
x + motion_x < 0 || x + motion_x >= s->avctx->width)
|
|
return;
|
|
|
|
palette_plane = frame->data[0];
|
|
prev_palette_plane = s->last_frame->data[0];
|
|
if (!prev_palette_plane)
|
|
prev_palette_plane = palette_plane;
|
|
stride = frame->linesize[0];
|
|
line_inc = stride - width;
|
|
curframe_index = y * stride + x;
|
|
curframe_x = x;
|
|
prevframe_index = (y + motion_y) * stride + x + motion_x;
|
|
prevframe_x = x + motion_x;
|
|
|
|
if (prev_palette_plane == palette_plane && FFABS(motion_x + width*motion_y) < pixel_count) {
|
|
avpriv_request_sample(s->avctx, "Overlapping copy");
|
|
return ;
|
|
}
|
|
|
|
while (pixel_count &&
|
|
curframe_index < s->frame_size &&
|
|
prevframe_index < s->frame_size) {
|
|
int count = FFMIN3(pixel_count, width - curframe_x,
|
|
width - prevframe_x);
|
|
|
|
memcpy(palette_plane + curframe_index,
|
|
prev_palette_plane + prevframe_index, count);
|
|
pixel_count -= count;
|
|
curframe_index += count;
|
|
prevframe_index += count;
|
|
curframe_x += count;
|
|
prevframe_x += count;
|
|
|
|
if (curframe_x >= width) {
|
|
curframe_index += line_inc;
|
|
curframe_x = 0;
|
|
}
|
|
|
|
if (prevframe_x >= width) {
|
|
prevframe_index += line_inc;
|
|
prevframe_x = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int xan_wc3_decode_frame(XanContext *s, AVFrame *frame)
|
|
{
|
|
|
|
int width = s->avctx->width;
|
|
int height = s->avctx->height;
|
|
int total_pixels = width * height;
|
|
uint8_t opcode;
|
|
uint8_t flag = 0;
|
|
int size = 0;
|
|
int motion_x, motion_y;
|
|
int x, y, ret;
|
|
|
|
uint8_t *opcode_buffer = s->buffer1;
|
|
uint8_t *opcode_buffer_end = s->buffer1 + s->buffer1_size;
|
|
int opcode_buffer_size = s->buffer1_size;
|
|
const uint8_t *imagedata_buffer = s->buffer2;
|
|
|
|
/* pointers to segments inside the compressed chunk */
|
|
const uint8_t *huffman_segment;
|
|
GetByteContext size_segment;
|
|
GetByteContext vector_segment;
|
|
const uint8_t *imagedata_segment;
|
|
int huffman_offset, size_offset, vector_offset, imagedata_offset,
|
|
imagedata_size;
|
|
|
|
if (s->size < 8)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
huffman_offset = AV_RL16(&s->buf[0]);
|
|
size_offset = AV_RL16(&s->buf[2]);
|
|
vector_offset = AV_RL16(&s->buf[4]);
|
|
imagedata_offset = AV_RL16(&s->buf[6]);
|
|
|
|
if (huffman_offset >= s->size ||
|
|
size_offset >= s->size ||
|
|
vector_offset >= s->size ||
|
|
imagedata_offset >= s->size)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
huffman_segment = s->buf + huffman_offset;
|
|
bytestream2_init(&size_segment, s->buf + size_offset, s->size - size_offset);
|
|
bytestream2_init(&vector_segment, s->buf + vector_offset, s->size - vector_offset);
|
|
imagedata_segment = s->buf + imagedata_offset;
|
|
|
|
if ((ret = xan_huffman_decode(opcode_buffer, opcode_buffer_size,
|
|
huffman_segment, s->size - huffman_offset)) < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
opcode_buffer_end = opcode_buffer + ret;
|
|
|
|
if (imagedata_segment[0] == 2) {
|
|
xan_unpack(s->buffer2, s->buffer2_size,
|
|
&imagedata_segment[1], s->size - imagedata_offset - 1);
|
|
imagedata_size = s->buffer2_size;
|
|
} else {
|
|
imagedata_size = s->size - imagedata_offset - 1;
|
|
imagedata_buffer = &imagedata_segment[1];
|
|
}
|
|
|
|
/* use the decoded data segments to build the frame */
|
|
x = y = 0;
|
|
while (total_pixels && opcode_buffer < opcode_buffer_end) {
|
|
|
|
opcode = *opcode_buffer++;
|
|
size = 0;
|
|
|
|
switch (opcode) {
|
|
|
|
case 0:
|
|
flag ^= 1;
|
|
continue;
|
|
|
|
case 1:
|
|
case 2:
|
|
case 3:
|
|
case 4:
|
|
case 5:
|
|
case 6:
|
|
case 7:
|
|
case 8:
|
|
size = opcode;
|
|
break;
|
|
|
|
case 12:
|
|
case 13:
|
|
case 14:
|
|
case 15:
|
|
case 16:
|
|
case 17:
|
|
case 18:
|
|
size += (opcode - 10);
|
|
break;
|
|
|
|
case 9:
|
|
case 19:
|
|
if (bytestream2_get_bytes_left(&size_segment) < 1) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "size_segment overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
size = bytestream2_get_byte(&size_segment);
|
|
break;
|
|
|
|
case 10:
|
|
case 20:
|
|
if (bytestream2_get_bytes_left(&size_segment) < 2) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "size_segment overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
size = bytestream2_get_be16(&size_segment);
|
|
break;
|
|
|
|
case 11:
|
|
case 21:
|
|
if (bytestream2_get_bytes_left(&size_segment) < 3) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "size_segment overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
size = bytestream2_get_be24(&size_segment);
|
|
break;
|
|
}
|
|
|
|
if (size > total_pixels)
|
|
break;
|
|
|
|
if (opcode < 12) {
|
|
flag ^= 1;
|
|
if (flag) {
|
|
/* run of (size) pixels is unchanged from last frame */
|
|
xan_wc3_copy_pixel_run(s, frame, x, y, size, 0, 0);
|
|
} else {
|
|
/* output a run of pixels from imagedata_buffer */
|
|
if (imagedata_size < size)
|
|
break;
|
|
xan_wc3_output_pixel_run(s, frame, imagedata_buffer, x, y, size);
|
|
imagedata_buffer += size;
|
|
imagedata_size -= size;
|
|
}
|
|
} else {
|
|
uint8_t vector;
|
|
if (bytestream2_get_bytes_left(&vector_segment) <= 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "vector_segment overread\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
/* run-based motion compensation from last frame */
|
|
vector = bytestream2_get_byte(&vector_segment);
|
|
motion_x = sign_extend(vector >> 4, 4);
|
|
motion_y = sign_extend(vector & 0xF, 4);
|
|
|
|
/* copy a run of pixels from the previous frame */
|
|
xan_wc3_copy_pixel_run(s, frame, x, y, size, motion_x, motion_y);
|
|
|
|
flag = 0;
|
|
}
|
|
|
|
/* coordinate accounting */
|
|
total_pixels -= size;
|
|
y += (x + size) / width;
|
|
x = (x + size) % width;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
#if RUNTIME_GAMMA
|
|
static inline unsigned mul(unsigned a, unsigned b)
|
|
{
|
|
return (a * b) >> 16;
|
|
}
|
|
|
|
static inline unsigned pow4(unsigned a)
|
|
{
|
|
unsigned square = mul(a, a);
|
|
return mul(square, square);
|
|
}
|
|
|
|
static inline unsigned pow5(unsigned a)
|
|
{
|
|
return mul(pow4(a), a);
|
|
}
|
|
|
|
static uint8_t gamma_corr(uint8_t in) {
|
|
unsigned lo, hi = 0xff40, target;
|
|
int i = 15;
|
|
in = (in << 2) | (in >> 6);
|
|
/* equivalent float code:
|
|
if (in >= 252)
|
|
return 253;
|
|
return round(pow(in / 256.0, 0.8) * 256);
|
|
*/
|
|
lo = target = in << 8;
|
|
do {
|
|
unsigned mid = (lo + hi) >> 1;
|
|
unsigned pow = pow5(mid);
|
|
if (pow > target) hi = mid;
|
|
else lo = mid;
|
|
} while (--i);
|
|
return (pow4((lo + hi) >> 1) + 0x80) >> 8;
|
|
}
|
|
#else
|
|
/**
|
|
* 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.
|
|
*/
|
|
static const uint8_t gamma_lookup[256] = {
|
|
0x00, 0x09, 0x10, 0x16, 0x1C, 0x21, 0x27, 0x2C,
|
|
0x31, 0x35, 0x3A, 0x3F, 0x43, 0x48, 0x4C, 0x50,
|
|
0x54, 0x59, 0x5D, 0x61, 0x65, 0x69, 0x6D, 0x71,
|
|
0x75, 0x79, 0x7D, 0x80, 0x84, 0x88, 0x8C, 0x8F,
|
|
0x93, 0x97, 0x9A, 0x9E, 0xA2, 0xA5, 0xA9, 0xAC,
|
|
0xB0, 0xB3, 0xB7, 0xBA, 0xBE, 0xC1, 0xC5, 0xC8,
|
|
0xCB, 0xCF, 0xD2, 0xD5, 0xD9, 0xDC, 0xDF, 0xE3,
|
|
0xE6, 0xE9, 0xED, 0xF0, 0xF3, 0xF6, 0xFA, 0xFD,
|
|
0x03, 0x0B, 0x12, 0x18, 0x1D, 0x23, 0x28, 0x2D,
|
|
0x32, 0x36, 0x3B, 0x40, 0x44, 0x49, 0x4D, 0x51,
|
|
0x56, 0x5A, 0x5E, 0x62, 0x66, 0x6A, 0x6E, 0x72,
|
|
0x76, 0x7A, 0x7D, 0x81, 0x85, 0x89, 0x8D, 0x90,
|
|
0x94, 0x98, 0x9B, 0x9F, 0xA2, 0xA6, 0xAA, 0xAD,
|
|
0xB1, 0xB4, 0xB8, 0xBB, 0xBF, 0xC2, 0xC5, 0xC9,
|
|
0xCC, 0xD0, 0xD3, 0xD6, 0xDA, 0xDD, 0xE0, 0xE4,
|
|
0xE7, 0xEA, 0xED, 0xF1, 0xF4, 0xF7, 0xFA, 0xFD,
|
|
0x05, 0x0D, 0x13, 0x19, 0x1F, 0x24, 0x29, 0x2E,
|
|
0x33, 0x38, 0x3C, 0x41, 0x45, 0x4A, 0x4E, 0x52,
|
|
0x57, 0x5B, 0x5F, 0x63, 0x67, 0x6B, 0x6F, 0x73,
|
|
0x77, 0x7B, 0x7E, 0x82, 0x86, 0x8A, 0x8D, 0x91,
|
|
0x95, 0x99, 0x9C, 0xA0, 0xA3, 0xA7, 0xAA, 0xAE,
|
|
0xB2, 0xB5, 0xB9, 0xBC, 0xBF, 0xC3, 0xC6, 0xCA,
|
|
0xCD, 0xD0, 0xD4, 0xD7, 0xDA, 0xDE, 0xE1, 0xE4,
|
|
0xE8, 0xEB, 0xEE, 0xF1, 0xF5, 0xF8, 0xFB, 0xFD,
|
|
0x07, 0x0E, 0x15, 0x1A, 0x20, 0x25, 0x2A, 0x2F,
|
|
0x34, 0x39, 0x3D, 0x42, 0x46, 0x4B, 0x4F, 0x53,
|
|
0x58, 0x5C, 0x60, 0x64, 0x68, 0x6C, 0x70, 0x74,
|
|
0x78, 0x7C, 0x7F, 0x83, 0x87, 0x8B, 0x8E, 0x92,
|
|
0x96, 0x99, 0x9D, 0xA1, 0xA4, 0xA8, 0xAB, 0xAF,
|
|
0xB2, 0xB6, 0xB9, 0xBD, 0xC0, 0xC4, 0xC7, 0xCB,
|
|
0xCE, 0xD1, 0xD5, 0xD8, 0xDB, 0xDF, 0xE2, 0xE5,
|
|
0xE9, 0xEC, 0xEF, 0xF2, 0xF6, 0xF9, 0xFC, 0xFD
|
|
};
|
|
#endif
|
|
|
|
static int xan_decode_frame(AVCodecContext *avctx,
|
|
void *data, int *got_frame,
|
|
AVPacket *avpkt)
|
|
{
|
|
AVFrame *frame = data;
|
|
const uint8_t *buf = avpkt->data;
|
|
int ret, buf_size = avpkt->size;
|
|
XanContext *s = avctx->priv_data;
|
|
GetByteContext ctx;
|
|
int tag = 0;
|
|
|
|
bytestream2_init(&ctx, buf, buf_size);
|
|
while (bytestream2_get_bytes_left(&ctx) > 8 && tag != VGA__TAG) {
|
|
unsigned *tmpptr;
|
|
uint32_t new_pal;
|
|
int size;
|
|
int i;
|
|
tag = bytestream2_get_le32(&ctx);
|
|
size = bytestream2_get_be32(&ctx);
|
|
if (size < 0) {
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid tag size %d\n", size);
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
size = FFMIN(size, bytestream2_get_bytes_left(&ctx));
|
|
switch (tag) {
|
|
case PALT_TAG:
|
|
if (size < PALETTE_SIZE)
|
|
return AVERROR_INVALIDDATA;
|
|
if (s->palettes_count >= PALETTES_MAX)
|
|
return AVERROR_INVALIDDATA;
|
|
tmpptr = av_realloc_array(s->palettes,
|
|
s->palettes_count + 1, AVPALETTE_SIZE);
|
|
if (!tmpptr)
|
|
return AVERROR(ENOMEM);
|
|
s->palettes = tmpptr;
|
|
tmpptr += s->palettes_count * AVPALETTE_COUNT;
|
|
for (i = 0; i < PALETTE_COUNT; i++) {
|
|
#if RUNTIME_GAMMA
|
|
int r = gamma_corr(bytestream2_get_byteu(&ctx));
|
|
int g = gamma_corr(bytestream2_get_byteu(&ctx));
|
|
int b = gamma_corr(bytestream2_get_byteu(&ctx));
|
|
#else
|
|
int r = gamma_lookup[bytestream2_get_byteu(&ctx)];
|
|
int g = gamma_lookup[bytestream2_get_byteu(&ctx)];
|
|
int b = gamma_lookup[bytestream2_get_byteu(&ctx)];
|
|
#endif
|
|
*tmpptr++ = (0xFFU << 24) | (r << 16) | (g << 8) | b;
|
|
}
|
|
s->palettes_count++;
|
|
break;
|
|
case SHOT_TAG:
|
|
if (size < 4)
|
|
return AVERROR_INVALIDDATA;
|
|
new_pal = bytestream2_get_le32(&ctx);
|
|
if (new_pal < s->palettes_count) {
|
|
s->cur_palette = new_pal;
|
|
} else
|
|
av_log(avctx, AV_LOG_ERROR, "Invalid palette selected\n");
|
|
break;
|
|
case VGA__TAG:
|
|
break;
|
|
default:
|
|
bytestream2_skip(&ctx, size);
|
|
break;
|
|
}
|
|
}
|
|
buf_size = bytestream2_get_bytes_left(&ctx);
|
|
|
|
if (s->palettes_count <= 0) {
|
|
av_log(s->avctx, AV_LOG_ERROR, "No palette found\n");
|
|
return AVERROR_INVALIDDATA;
|
|
}
|
|
|
|
if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
|
|
return ret;
|
|
|
|
if (!s->frame_size)
|
|
s->frame_size = frame->linesize[0] * s->avctx->height;
|
|
|
|
memcpy(frame->data[1],
|
|
s->palettes + s->cur_palette * AVPALETTE_COUNT, AVPALETTE_SIZE);
|
|
|
|
s->buf = ctx.buffer;
|
|
s->size = buf_size;
|
|
|
|
if (xan_wc3_decode_frame(s, frame) < 0)
|
|
return AVERROR_INVALIDDATA;
|
|
|
|
av_frame_unref(s->last_frame);
|
|
if ((ret = av_frame_ref(s->last_frame, frame)) < 0)
|
|
return ret;
|
|
|
|
*got_frame = 1;
|
|
|
|
/* always report that the buffer was completely consumed */
|
|
return buf_size;
|
|
}
|
|
|
|
AVCodec ff_xan_wc3_decoder = {
|
|
.name = "xan_wc3",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Wing Commander III / Xan"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_XAN_WC3,
|
|
.priv_data_size = sizeof(XanContext),
|
|
.init = xan_decode_init,
|
|
.close = xan_decode_end,
|
|
.decode = xan_decode_frame,
|
|
.capabilities = AV_CODEC_CAP_DR1,
|
|
};
|