* Wing Commander/Xan Video Decoder
* Copyright (C) 2003 the ffmpeg project
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of Libav.
+ *
+ * Libav 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library is distributed in the hope that it will be useful,
+ * Libav 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file xan.c
- * Xan video decoder for Wing Commander III & IV computer games
+ * @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 the following colorspaces natively:
- * PAL8 (default), RGB555, RGB565, RGB24, BGR24, RGBA32, YUV444P
+ * The xan_wc3 decoder outputs PAL8 data.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#include <unistd.h>
-#include "common.h"
+#include "libavutil/intreadwrite.h"
+#include "libavutil/mem.h"
#include "avcodec.h"
-#include "dsputil.h"
+#include "bytestream.h"
+#define BITSTREAM_READER_LE
+#include "get_bits.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_CONTROL_SIZE ((256 * 3) + 1)
+#define PALETTE_SIZE (PALETTE_COUNT * 3)
+#define PALETTES_MAX 256
typedef struct XanContext {
AVCodecContext *avctx;
- DSPContext dsp;
AVFrame last_frame;
AVFrame current_frame;
- unsigned char *buf;
+ const unsigned char *buf;
int size;
- unsigned char palette[PALETTE_COUNT * 4];
-
/* scratch space */
unsigned char *buffer1;
+ int buffer1_size;
unsigned char *buffer2;
+ int buffer2_size;
-} XanContext;
-
-#define BE_16(x) ((((uint8_t*)(x))[0] << 8) | ((uint8_t*)(x))[1])
-#define LE_16(x) ((((uint8_t*)(x))[1] << 8) | ((uint8_t*)(x))[0])
-#define LE_32(x) ((((uint8_t*)(x))[3] << 24) | \
- (((uint8_t*)(x))[2] << 16) | \
- (((uint8_t*)(x))[1] << 8) | \
- ((uint8_t*)(x))[0])
-
-/* RGB -> YUV conversion stuff */
-#define SCALEFACTOR 65536
-#define CENTERSAMPLE 128
-
-#define COMPUTE_Y(r, g, b) \
- (unsigned char) \
- ((y_r_table[r] + y_g_table[g] + y_b_table[b]) / SCALEFACTOR)
-#define COMPUTE_U(r, g, b) \
- (unsigned char) \
- ((u_r_table[r] + u_g_table[g] + u_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
-#define COMPUTE_V(r, g, b) \
- (unsigned char) \
- ((v_r_table[r] + v_g_table[g] + v_b_table[b]) / SCALEFACTOR + CENTERSAMPLE)
-
-#define Y_R (SCALEFACTOR * 0.29900)
-#define Y_G (SCALEFACTOR * 0.58700)
-#define Y_B (SCALEFACTOR * 0.11400)
-
-#define U_R (SCALEFACTOR * -0.16874)
-#define U_G (SCALEFACTOR * -0.33126)
-#define U_B (SCALEFACTOR * 0.50000)
-
-#define V_R (SCALEFACTOR * 0.50000)
-#define V_G (SCALEFACTOR * -0.41869)
-#define V_B (SCALEFACTOR * -0.08131)
-
-/*
- * Precalculate all of the YUV tables since it requires fewer than
- * 10 kilobytes to store them.
- */
-static int y_r_table[256];
-static int y_g_table[256];
-static int y_b_table[256];
+ unsigned *palettes;
+ int palettes_count;
+ int cur_palette;
-static int u_r_table[256];
-static int u_g_table[256];
-static int u_b_table[256];
+ int frame_size;
-static int v_r_table[256];
-static int v_g_table[256];
-static int v_b_table[256];
+} XanContext;
-static int xan_decode_init(AVCodecContext *avctx)
+static av_cold int xan_decode_init(AVCodecContext *avctx)
{
XanContext *s = avctx->priv_data;
- int i;
s->avctx = avctx;
-
- if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
- (s->avctx->extradata_size != sizeof(AVPaletteControl))) {
- printf (" WC3 Xan video: expected extradata_size of %d\n",
- sizeof(AVPaletteControl));
- return -1;
- }
-
- avctx->pix_fmt = PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
- dsputil_init(&s->dsp, avctx);
-
- /* initialize the RGB -> YUV tables */
- for (i = 0; i < 256; i++) {
- y_r_table[i] = Y_R * i;
- y_g_table[i] = Y_G * i;
- y_b_table[i] = Y_B * i;
-
- u_r_table[i] = U_R * i;
- u_g_table[i] = U_G * i;
- u_b_table[i] = U_B * i;
-
- v_r_table[i] = V_R * i;
- v_g_table[i] = V_G * i;
- v_b_table[i] = V_B * i;
+ 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->buffer1 = av_malloc(avctx->width * avctx->height);
- s->buffer2 = av_malloc(avctx->width * avctx->height);
- if (!s->buffer1 || !s->buffer2)
- return -1;
-
return 0;
}
-/* This function is used in lieu of memcpy(). This decoder can not use
- * memcpy because the memory locations often overlap and
- * memcpy doesn't like that; it's not uncommon, for example, for
- * dest = src+1, to turn byte A into pattern AAAAAAAA.
- * This was originally repz movsb in Intel x86 ASM. */
-static inline void bytecopy(unsigned char *dest, unsigned char *src, int count)
-{
- int i;
-
- for (i = 0; i < count; i++)
- dest[i] = src[i];
-}
-
-static int xan_huffman_decode(unsigned char *dest, unsigned char *src)
+static int xan_huffman_decode(unsigned char *dest, int dest_len,
+ const unsigned char *src, int src_len)
{
unsigned char byte = *src++;
unsigned char ival = byte + 0x16;
- unsigned char * ptr = src + byte*2;
+ const unsigned char * ptr = src + byte*2;
+ int ptr_len = src_len - 1 - byte*2;
unsigned char val = ival;
- int counter = 0;
+ unsigned char *dest_end = dest + dest_len;
+ GetBitContext gb;
+
+ if (ptr_len < 0)
+ return AVERROR_INVALIDDATA;
- unsigned char bits = *ptr++;
+ init_get_bits(&gb, ptr, ptr_len * 8);
- while ( val != 0x16 ) {
- if ( (1 << counter) & bits )
- val = src[byte + val - 0x17];
- else
- val = src[val - 0x17];
+ while (val != 0x16) {
+ unsigned idx = val - 0x17 + get_bits1(&gb) * byte;
+ if (idx >= 2 * byte)
+ return -1;
+ val = src[idx];
- if ( val < 0x16 ) {
+ if (val < 0x16) {
+ if (dest >= dest_end)
+ return 0;
*dest++ = val;
val = ival;
}
-
- if (counter++ == 7) {
- counter = 0;
- bits = *ptr++;
- }
}
return 0;
}
-static void xan_unpack(unsigned char *dest, unsigned char *src)
+/**
+ * unpack simple compression
+ *
+ * @param dest destination buffer of dest_len, must be padded with at least 130 bytes
+ */
+static void xan_unpack(unsigned char *dest, int dest_len,
+ const unsigned char *src, int src_len)
{
unsigned char opcode;
int size;
- int offset;
- int byte1, byte2, byte3;
+ unsigned char *dest_org = dest;
+ unsigned char *dest_end = dest + dest_len;
+ const unsigned char *src_end = src + src_len;
- for (;;) {
+ while (dest < dest_end && src < src_end) {
opcode = *src++;
- if ( (opcode & 0x80) == 0 ) {
-
- offset = *src++;
-
- size = opcode & 3;
- bytecopy(dest, src, size); dest += size; src += size;
-
- size = ((opcode & 0x1c) >> 2) + 3;
- bytecopy (dest, dest - (((opcode & 0x60) << 3) + offset + 1), size);
- dest += size;
-
- } else if ( (opcode & 0x40) == 0 ) {
+ if (opcode < 0xe0) {
+ int size2, back;
+ if ((opcode & 0x80) == 0) {
+ size = opcode & 3;
- byte1 = *src++;
- byte2 = *src++;
+ back = ((opcode & 0x60) << 3) + *src++ + 1;
+ size2 = ((opcode & 0x1c) >> 2) + 3;
+ } else if ((opcode & 0x40) == 0) {
+ size = *src >> 6;
- size = byte1 >> 6;
- bytecopy (dest, src, size); dest += size; src += size;
-
- size = (opcode & 0x3f) + 4;
- bytecopy (dest, dest - (((byte1 & 0x3f) << 8) + byte2 + 1), size);
- dest += size;
-
- } else if ( (opcode & 0x20) == 0 ) {
-
- byte1 = *src++;
- byte2 = *src++;
- byte3 = *src++;
+ back = (bytestream_get_be16(&src) & 0x3fff) + 1;
+ size2 = (opcode & 0x3f) + 4;
+ } else {
+ size = opcode & 3;
- size = opcode & 3;
- bytecopy (dest, src, size); dest += size; src += size;
+ back = ((opcode & 0x10) << 12) + bytestream_get_be16(&src) + 1;
+ size2 = ((opcode & 0x0c) << 6) + *src++ + 5;
+ }
- size = byte3 + 5 + ((opcode & 0xc) << 6);
- bytecopy (dest,
- dest - ((((opcode & 0x10) >> 4) << 0x10) + 1 + (byte1 << 8) + byte2),
- size);
- dest += size;
+ if (dest_end - dest < size + size2 ||
+ dest + size - dest_org < back ||
+ src_end - src < size)
+ return;
+ memcpy(dest, src, size); dest += size; src += size;
+ av_memcpy_backptr(dest, back, size2);
+ dest += size2;
} else {
- size = ((opcode & 0x1f) << 2) + 4;
-
- if (size > 0x70)
- break;
-
- bytecopy (dest, src, size); dest += size; src += size;
+ int finish = opcode >= 0xfc;
+ size = finish ? opcode & 3 : ((opcode & 0x1f) << 2) + 4;
+
+ if (dest_end - dest < size || src_end - src < size)
+ return;
+ memcpy(dest, src, size); dest += size; src += size;
+ if (finish)
+ return;
}
}
-
- size = opcode & 3;
- bytecopy(dest, src, size); dest += size; src += size;
}
-static void inline xan_wc3_build_palette(XanContext *s,
- unsigned char *palette_data)
-{
- int i;
- unsigned char r, g, b;
- unsigned short *palette16;
- unsigned int *palette32;
-
- /* transform the palette passed through the palette control structure
- * into the necessary internal format depending on colorspace */
-
- switch (s->avctx->pix_fmt) {
-
- case PIX_FMT_PAL8:
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
- s->palette[i * 4 + 0] = b;
- s->palette[i * 4 + 1] = g;
- s->palette[i * 4 + 2] = r;
- }
- break;
-
- case PIX_FMT_RGB555:
- palette16 = (unsigned short *)s->palette;
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
- palette16[i] =
- ((r >> 3) << 10) |
- ((g >> 3) << 5) |
- ((g >> 3) << 0);
- }
- break;
-
- case PIX_FMT_RGB565:
- palette16 = (unsigned short *)s->palette;
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
- palette16[i] =
- ((r >> 3) << 11) |
- ((g >> 2) << 5) |
- ((g >> 3) << 0);
- }
- break;
-
- case PIX_FMT_RGB24:
- for (i = 0; i < PALETTE_COUNT; i++) {
- s->palette[i * 4 + 0] = *palette_data++;
- s->palette[i * 4 + 1] = *palette_data++;
- s->palette[i * 4 + 2] = *palette_data++;
- }
- break;
-
- case PIX_FMT_BGR24:
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
- s->palette[i * 4 + 0] = b;
- s->palette[i * 4 + 1] = g;
- s->palette[i * 4 + 2] = r;
- }
- break;
-
- case PIX_FMT_RGBA32:
- palette32 = (unsigned int *)s->palette;
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
- palette32[i] = (r << 16) | (g << 8) | (b);
- }
- break;
-
- case PIX_FMT_YUV444P:
- for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
- s->palette[i * 4 + 0] = COMPUTE_Y(r, g, b);
- s->palette[i * 4 + 1] = COMPUTE_U(r, g, b);
- s->palette[i * 4 + 2] = COMPUTE_V(r, g, b);
- }
- break;
-
- default:
- printf (" Xan WC3: Unhandled colorspace\n");
- break;
- }
-}
-
-static void inline xan_wc3_output_pixel_run(XanContext *s,
- unsigned char *pixel_buffer, int x, int y, int pixel_count)
+static inline void xan_wc3_output_pixel_run(XanContext *s,
+ const unsigned char *pixel_buffer, int x, int y, int pixel_count)
{
int stride;
int line_inc;
int index;
int current_x;
int width = s->avctx->width;
- unsigned char pixel;
unsigned char *palette_plane;
- unsigned char *y_plane;
- unsigned char *u_plane;
- unsigned char *v_plane;
- unsigned char *rgb_plane;
- unsigned short *rgb16_plane;
- unsigned short *palette16;
- unsigned int *rgb32_plane;
- unsigned int *palette32;
-
- switch (s->avctx->pix_fmt) {
-
- case PIX_FMT_PAL8:
- palette_plane = s->current_frame.data[0];
- stride = s->current_frame.linesize[0];
- line_inc = stride - width;
- index = y * stride + x;
- current_x = x;
- while(pixel_count--) {
-
- /* don't do a memcpy() here; keyframes generally copy an entire
- * frame of data and the stride needs to be accounted for */
- palette_plane[index++] = *pixel_buffer++;
-
- current_x++;
- if (current_x >= width) {
- /* reset accounting variables */
- index += line_inc;
- current_x = 0;
- }
- }
- break;
-
- case PIX_FMT_RGB555:
- case PIX_FMT_RGB565:
- rgb16_plane = (unsigned short *)s->current_frame.data[0];
- palette16 = (unsigned short *)s->palette;
- stride = s->current_frame.linesize[0] / 2;
- line_inc = stride - width;
- index = y * stride + x;
- current_x = x;
- while(pixel_count--) {
-
- rgb16_plane[index++] = palette16[*pixel_buffer++];
-
- current_x++;
- if (current_x >= width) {
- /* reset accounting variables */
- index += line_inc;
- current_x = 0;
- }
- }
- break;
-
- case PIX_FMT_RGB24:
- case PIX_FMT_BGR24:
- rgb_plane = s->current_frame.data[0];
- stride = s->current_frame.linesize[0];
- line_inc = stride - width * 3;
- index = y * stride + x * 3;
- current_x = x;
- while(pixel_count--) {
- pixel = *pixel_buffer++;
-
- rgb_plane[index++] = s->palette[pixel * 4 + 0];
- rgb_plane[index++] = s->palette[pixel * 4 + 1];
- rgb_plane[index++] = s->palette[pixel * 4 + 2];
-
- current_x++;
- if (current_x >= width) {
- /* reset accounting variables */
- index += line_inc;
- current_x = 0;
- }
- }
- break;
-
- case PIX_FMT_RGBA32:
- rgb32_plane = (unsigned int *)s->current_frame.data[0];
- palette32 = (unsigned int *)s->palette;
- stride = s->current_frame.linesize[0] / 4;
- line_inc = stride - width;
- index = y * stride + x;
- current_x = x;
- while(pixel_count--) {
-
- rgb32_plane[index++] = palette32[*pixel_buffer++];
-
- current_x++;
- if (current_x >= width) {
- /* reset accounting variables */
- index += line_inc;
- current_x = 0;
- }
- }
- break;
-
- case PIX_FMT_YUV444P:
- y_plane = s->current_frame.data[0];
- u_plane = s->current_frame.data[1];
- v_plane = s->current_frame.data[2];
- stride = s->current_frame.linesize[0];
- line_inc = stride - width;
- index = y * stride + x;
- current_x = x;
- while(pixel_count--) {
- pixel = *pixel_buffer++;
-
- y_plane[index] = s->palette[pixel * 4 + 0];
- u_plane[index] = s->palette[pixel * 4 + 1];
- v_plane[index] = s->palette[pixel * 4 + 2];
-
- index++;
- current_x++;
- if (current_x >= width) {
- /* reset accounting variables */
- index += line_inc;
- current_x = 0;
- }
- }
- break;
- default:
- printf (" Xan WC3: Unhandled colorspace\n");
- break;
+ palette_plane = s->current_frame.data[0];
+ stride = s->current_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 void inline xan_wc3_copy_pixel_run(XanContext *s,
- int x, int y, int pixel_count, int motion_x, int motion_y)
+static inline void xan_wc3_copy_pixel_run(XanContext *s, int x, int y,
+ int pixel_count, int motion_x,
+ int motion_y)
{
int stride;
int line_inc;
int curframe_x, prevframe_x;
int width = s->avctx->width;
unsigned char *palette_plane, *prev_palette_plane;
- unsigned char *y_plane, *u_plane, *v_plane;
- unsigned char *prev_y_plane, *prev_u_plane, *prev_v_plane;
- unsigned char *rgb_plane, *prev_rgb_plane;
- unsigned short *rgb16_plane, *prev_rgb16_plane;
- unsigned int *rgb32_plane, *prev_rgb32_plane;
-
- switch (s->avctx->pix_fmt) {
-
- case PIX_FMT_PAL8:
- palette_plane = s->current_frame.data[0];
- prev_palette_plane = s->last_frame.data[0];
- stride = s->current_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;
- while(pixel_count--) {
-
- palette_plane[curframe_index++] =
- prev_palette_plane[prevframe_index++];
-
- curframe_x++;
- if (curframe_x >= width) {
- /* reset accounting variables */
- curframe_index += line_inc;
- curframe_x = 0;
- }
-
- prevframe_x++;
- if (prevframe_x >= width) {
- /* reset accounting variables */
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
- }
- break;
-
- case PIX_FMT_RGB555:
- case PIX_FMT_RGB565:
- rgb16_plane = (unsigned short *)s->current_frame.data[0];
- prev_rgb16_plane = (unsigned short *)s->last_frame.data[0];
- stride = s->current_frame.linesize[0] / 2;
- 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;
- while(pixel_count--) {
-
- rgb16_plane[curframe_index++] =
- prev_rgb16_plane[prevframe_index++];
-
- curframe_x++;
- if (curframe_x >= width) {
- /* reset accounting variables */
- curframe_index += line_inc;
- curframe_x = 0;
- }
-
- prevframe_x++;
- if (prevframe_x >= width) {
- /* reset accounting variables */
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
- }
- break;
-
- case PIX_FMT_RGB24:
- case PIX_FMT_BGR24:
- rgb_plane = s->current_frame.data[0];
- prev_rgb_plane = s->last_frame.data[0];
- stride = s->current_frame.linesize[0];
- line_inc = stride - width * 3;
- curframe_index = y * stride + x * 3;
- curframe_x = x;
- prevframe_index = (y + motion_y) * stride +
- (3 * (x + motion_x));
- prevframe_x = x + motion_x;
- while(pixel_count--) {
-
- rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
- rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
- rgb_plane[curframe_index++] = prev_rgb_plane[prevframe_index++];
-
- curframe_x++;
- if (curframe_x >= width) {
- /* reset accounting variables */
- curframe_index += line_inc;
- curframe_x = 0;
- }
- prevframe_x++;
- if (prevframe_x >= width) {
- /* reset accounting variables */
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
+ if (y + motion_y < 0 || y + motion_y >= s->avctx->height ||
+ x + motion_x < 0 || x + motion_x >= s->avctx->width)
+ return;
+
+ palette_plane = s->current_frame.data[0];
+ prev_palette_plane = s->last_frame.data[0];
+ if (!prev_palette_plane)
+ prev_palette_plane = palette_plane;
+ stride = s->current_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;
+ 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;
}
- break;
-
- case PIX_FMT_RGBA32:
- rgb32_plane = (unsigned int *)s->current_frame.data[0];
- prev_rgb32_plane = (unsigned int *)s->last_frame.data[0];
- stride = s->current_frame.linesize[0] / 4;
- 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;
- while(pixel_count--) {
-
- rgb32_plane[curframe_index++] =
- prev_rgb32_plane[prevframe_index++];
-
- curframe_x++;
- if (curframe_x >= width) {
- /* reset accounting variables */
- curframe_index += line_inc;
- curframe_x = 0;
- }
- prevframe_x++;
- if (prevframe_x >= width) {
- /* reset accounting variables */
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
+ if (prevframe_x >= width) {
+ prevframe_index += line_inc;
+ prevframe_x = 0;
}
- break;
-
- case PIX_FMT_YUV444P:
- y_plane = s->current_frame.data[0];
- u_plane = s->current_frame.data[1];
- v_plane = s->current_frame.data[2];
- prev_y_plane = s->last_frame.data[0];
- prev_u_plane = s->last_frame.data[1];
- prev_v_plane = s->last_frame.data[2];
- stride = s->current_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;
- while(pixel_count--) {
-
- y_plane[curframe_index] = prev_y_plane[prevframe_index];
- u_plane[curframe_index] = prev_u_plane[prevframe_index];
- v_plane[curframe_index] = prev_v_plane[prevframe_index];
-
- curframe_index++;
- curframe_x++;
- if (curframe_x >= width) {
- /* reset accounting variables */
- curframe_index += line_inc;
- curframe_x = 0;
- }
-
- prevframe_index++;
- prevframe_x++;
- if (prevframe_x >= width) {
- /* reset accounting variables */
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
- }
- break;
-
- default:
- printf (" Xan WC3: Unhandled colorspace\n");
- break;
}
}
-static void xan_wc3_decode_frame(XanContext *s) {
+static int xan_wc3_decode_frame(XanContext *s) {
- int width = s->avctx->width;
+ int width = s->avctx->width;
int height = s->avctx->height;
int total_pixels = width * height;
unsigned char opcode;
int x, y;
unsigned char *opcode_buffer = s->buffer1;
- unsigned char *imagedata_buffer = s->buffer2;
+ unsigned char *opcode_buffer_end = s->buffer1 + s->buffer1_size;
+ int opcode_buffer_size = s->buffer1_size;
+ const unsigned char *imagedata_buffer = s->buffer2;
/* pointers to segments inside the compressed chunk */
- unsigned char *huffman_segment;
- unsigned char *size_segment;
- unsigned char *vector_segment;
- unsigned char *imagedata_segment;
-
- huffman_segment = s->buf + LE_16(&s->buf[0]);
- size_segment = s->buf + LE_16(&s->buf[2]);
- vector_segment = s->buf + LE_16(&s->buf[4]);
- imagedata_segment = s->buf + LE_16(&s->buf[6]);
-
- xan_huffman_decode(opcode_buffer, huffman_segment);
-
- if (imagedata_segment[0] == 2)
- xan_unpack(imagedata_buffer, &imagedata_segment[1]);
- else
+ const unsigned char *huffman_segment;
+ const unsigned char *size_segment;
+ const unsigned char *vector_segment;
+ const unsigned char *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;
+ size_segment = s->buf + size_offset;
+ vector_segment = s->buf + vector_offset;
+ imagedata_segment = s->buf + imagedata_offset;
+
+ if (xan_huffman_decode(opcode_buffer, opcode_buffer_size,
+ huffman_segment, s->size - huffman_offset) < 0)
+ return AVERROR_INVALIDDATA;
+
+ 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) {
+ while (total_pixels && opcode_buffer < opcode_buffer_end) {
opcode = *opcode_buffer++;
size = 0;
case 10:
case 20:
- size = BE_16(&size_segment[0]);
+ size = AV_RB16(&size_segment[0]);
size_segment += 2;
break;
case 11:
case 21:
- size = (size_segment[0] << 16) | (size_segment[1] << 8) |
- size_segment[2];
+ size = AV_RB24(size_segment);
size_segment += 3;
break;
}
+ if (size > total_pixels)
+ break;
+
if (opcode < 12) {
flag ^= 1;
if (flag) {
xan_wc3_copy_pixel_run(s, 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, imagedata_buffer, x, y, size);
imagedata_buffer += size;
+ imagedata_size -= size;
}
} else {
/* run-based motion compensation from last frame */
- motion_x = (*vector_segment >> 4) & 0xF;
- motion_y = *vector_segment & 0xF;
+ motion_x = sign_extend(*vector_segment >> 4, 4);
+ motion_y = sign_extend(*vector_segment & 0xF, 4);
vector_segment++;
- /* sign extension */
- if (motion_x & 0x8)
- motion_x |= 0xFFFFFFF0;
- if (motion_y & 0x8)
- motion_y |= 0xFFFFFFF0;
-
/* copy a run of pixels from the previous frame */
xan_wc3_copy_pixel_run(s, x, y, size, motion_x, motion_y);
/* coordinate accounting */
total_pixels -= size;
- while (size) {
- if (x + size >= width) {
- y++;
- size -= (width - x);
- x = 0;
- } else {
- x += size;
- size = 0;
- }
- }
+ 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;
+}
- /* for PAL8, make the palette available on the way out */
- if (s->avctx->pix_fmt == PIX_FMT_PAL8)
- memcpy(s->current_frame.data[1], s->palette, PALETTE_COUNT * 4);
+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 void xan_wc4_decode_frame(XanContext *s) {
+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 *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int ret, buf_size = avpkt->size;
XanContext *s = avctx->priv_data;
- AVPaletteControl *palette_control = (AVPaletteControl *)avctx->extradata;
- int keyframe = 0;
-
- if (palette_control->palette_changed) {
- /* load the new palette and reset the palette control */
- xan_wc3_build_palette(s, palette_control->palette);
- palette_control->palette_changed = 0;
- keyframe = 1;
+
+ if (avctx->codec->id == AV_CODEC_ID_XAN_WC3) {
+ const uint8_t *buf_end = buf + buf_size;
+ int tag = 0;
+ while (buf_end - buf > 8 && tag != VGA__TAG) {
+ unsigned *tmpptr;
+ uint32_t new_pal;
+ int size;
+ int i;
+ tag = bytestream_get_le32(&buf);
+ size = bytestream_get_be32(&buf);
+ size = FFMIN(size, buf_end - buf);
+ switch (tag) {
+ case PALT_TAG:
+ if (size < PALETTE_SIZE)
+ return AVERROR_INVALIDDATA;
+ if (s->palettes_count >= PALETTES_MAX)
+ return AVERROR_INVALIDDATA;
+ tmpptr = av_realloc(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(*buf++);
+ int g = gamma_corr(*buf++);
+ int b = gamma_corr(*buf++);
+#else
+ int r = gamma_lookup[*buf++];
+ int g = gamma_lookup[*buf++];
+ int b = gamma_lookup[*buf++];
+#endif
+ *tmpptr++ = (r << 16) | (g << 8) | b;
+ }
+ s->palettes_count++;
+ break;
+ case SHOT_TAG:
+ if (size < 4)
+ return AVERROR_INVALIDDATA;
+ new_pal = bytestream_get_le32(&buf);
+ 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:
+ buf += size;
+ break;
+ }
+ }
+ buf_size = buf_end - buf;
+ }
+ if (s->palettes_count <= 0) {
+ av_log(s->avctx, AV_LOG_ERROR, "No palette found\n");
+ return AVERROR_INVALIDDATA;
}
- if (avctx->get_buffer(avctx, &s->current_frame)) {
- printf (" Xan Video: get_buffer() failed\n");
- return -1;
+ if ((ret = avctx->get_buffer(avctx, &s->current_frame))) {
+ av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return ret;
}
s->current_frame.reference = 3;
+ if (!s->frame_size)
+ s->frame_size = s->current_frame.linesize[0] * s->avctx->height;
+
+ memcpy(s->current_frame.data[1],
+ s->palettes + s->cur_palette * AVPALETTE_COUNT, AVPALETTE_SIZE);
+
s->buf = buf;
s->size = buf_size;
- if (avctx->codec->id == CODEC_ID_XAN_WC3)
- xan_wc3_decode_frame(s);
- else if (avctx->codec->id == CODEC_ID_XAN_WC4)
- xan_wc4_decode_frame(s);
+ if (xan_wc3_decode_frame(s) < 0)
+ return AVERROR_INVALIDDATA;
/* release the last frame if it is allocated */
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
- /* shuffle frames */
- s->last_frame = s->current_frame;
-
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->current_frame;
+ /* shuffle frames */
+ FFSWAP(AVFrame, s->current_frame, s->last_frame);
+
/* always report that the buffer was completely consumed */
return buf_size;
}
-static int xan_decode_end(AVCodecContext *avctx)
+static av_cold int xan_decode_end(AVCodecContext *avctx)
{
XanContext *s = avctx->priv_data;
- /* release the last frame */
- avctx->release_buffer(avctx, &s->last_frame);
+ /* release the frames */
+ if (s->last_frame.data[0])
+ avctx->release_buffer(avctx, &s->last_frame);
+ if (s->current_frame.data[0])
+ avctx->release_buffer(avctx, &s->current_frame);
- av_free(s->buffer1);
- av_free(s->buffer2);
+ av_freep(&s->buffer1);
+ av_freep(&s->buffer2);
+ av_freep(&s->palettes);
return 0;
}
-AVCodec xan_wc3_decoder = {
- "xan_wc3",
- CODEC_TYPE_VIDEO,
- CODEC_ID_XAN_WC3,
- sizeof(XanContext),
- xan_decode_init,
- NULL,
- xan_decode_end,
- xan_decode_frame,
- CODEC_CAP_DR1,
-};
-
-/*
-AVCodec xan_wc4_decoder = {
- "xan_wc4",
- CODEC_TYPE_VIDEO,
- CODEC_ID_XAN_WC4,
- sizeof(XanContext),
- xan_decode_init,
- NULL,
- xan_decode_end,
- xan_decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_xan_wc3_decoder = {
+ .name = "xan_wc3",
+ .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 = CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Wing Commander III / Xan"),
};
-*/
projects / ffmpeg / blobdiff