* Xan video decoder for Wing Commander III & IV computer games
* by Mario Brito (mbrito@student.dei.uc.pt)
* and Mike Melanson (melanson@pcisys.net)
- * For more information about the Xan format, visit:
- * http://www.pcisys.net/~melanson/codecs/
+ *
+ * The xan_wc3 decoder outputs the following colorspaces natively:
+ * PAL8 (default), RGB555, RGB565, RGB24, BGR24, RGBA32, YUV444P
*/
#include <stdio.h>
} 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
s->avctx = avctx;
if ((avctx->codec->id == CODEC_ID_XAN_WC3) &&
- (s->avctx->extradata_size != PALETTE_CONTROL_SIZE)) {
- printf (" WC3 Xan video: expected extradata_size of %d\n",
- PALETTE_CONTROL_SIZE);
+ (s->avctx->palctrl == NULL)) {
+ av_log(avctx, AV_LOG_ERROR, " WC3 Xan video: palette expected.\n");
return -1;
}
- avctx->pix_fmt = PIX_FMT_YUV444P;
+ avctx->pix_fmt = PIX_FMT_PAL8;
avctx->has_b_frames = 0;
dsputil_init(&s->dsp, avctx);
v_b_table[i] = V_B * i;
}
- s->buffer1 = av_malloc(avctx->width * avctx->height * 4);
- s->buffer2 = av_malloc(avctx->width * avctx->height * 4);
+ s->buffer1 = av_malloc(avctx->width * avctx->height);
+ s->buffer2 = av_malloc(avctx->width * avctx->height);
if (!s->buffer1 || !s->buffer2)
return -1;
dest[i] = src[i];
}
-static int xan_decode_method_1(unsigned char *dest, unsigned char *src)
+static int xan_huffman_decode(unsigned char *dest, unsigned char *src)
{
unsigned char byte = *src++;
unsigned char ival = byte + 0x16;
return 0;
}
-static int xan_decode_method_2(unsigned char *dest, unsigned char *src)
+static void xan_unpack(unsigned char *dest, unsigned char *src)
{
unsigned char opcode;
int size;
size = opcode & 3;
bytecopy(dest, src, size); dest += size; src += size;
-
- return 0;
}
static void inline xan_wc3_build_palette(XanContext *s,
- unsigned char *palette_data)
+ unsigned int *palette_data)
{
int i;
unsigned char r, g, b;
+ unsigned short *palette16;
+ unsigned int *palette32;
+ unsigned int pal_elem;
/* 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_RGB555:
+ palette16 = (unsigned short *)s->palette;
+ for (i = 0; i < PALETTE_COUNT; i++) {
+ pal_elem = palette_data[i];
+ r = (pal_elem >> 16) & 0xff;
+ g = (pal_elem >> 8) & 0xff;
+ b = pal_elem & 0xff;
+ palette16[i] =
+ ((r >> 3) << 10) |
+ ((g >> 3) << 5) |
+ ((b >> 3) << 0);
+ }
+ break;
+
+ case PIX_FMT_RGB565:
+ palette16 = (unsigned short *)s->palette;
+ for (i = 0; i < PALETTE_COUNT; i++) {
+ pal_elem = palette_data[i];
+ r = (pal_elem >> 16) & 0xff;
+ g = (pal_elem >> 8) & 0xff;
+ b = pal_elem & 0xff;
+ palette16[i] =
+ ((r >> 3) << 11) |
+ ((g >> 2) << 5) |
+ ((b >> 3) << 0);
+ }
+ break;
+
+ case PIX_FMT_RGB24:
+ for (i = 0; i < PALETTE_COUNT; i++) {
+ pal_elem = palette_data[i];
+ r = (pal_elem >> 16) & 0xff;
+ g = (pal_elem >> 8) & 0xff;
+ b = pal_elem & 0xff;
+ s->palette[i * 4 + 0] = r;
+ s->palette[i * 4 + 1] = g;
+ s->palette[i * 4 + 2] = b;
+ }
+ break;
+
+ case PIX_FMT_BGR24:
+ for (i = 0; i < PALETTE_COUNT; i++) {
+ pal_elem = palette_data[i];
+ r = (pal_elem >> 16) & 0xff;
+ g = (pal_elem >> 8) & 0xff;
+ b = pal_elem & 0xff;
+ s->palette[i * 4 + 0] = b;
+ s->palette[i * 4 + 1] = g;
+ s->palette[i * 4 + 2] = r;
+ }
+ break;
+
+ case PIX_FMT_PAL8:
+ case PIX_FMT_RGBA32:
+ palette32 = (unsigned int *)s->palette;
+ memcpy (palette32, palette_data, PALETTE_COUNT * sizeof(unsigned int));
+ break;
+
case PIX_FMT_YUV444P:
for (i = 0; i < PALETTE_COUNT; i++) {
- r = *palette_data++;
- g = *palette_data++;
- b = *palette_data++;
+ pal_elem = palette_data[i];
+ r = (pal_elem >> 16) & 0xff;
+ g = (pal_elem >> 8) & 0xff;
+ b = pal_elem & 0xff;
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");
+ av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n");
break;
}
}
+/* advance current_x variable; reset accounting variables if current_x
+ * moves beyond width */
+#define ADVANCE_CURRENT_X() \
+ current_x++; \
+ if (current_x >= width) { \
+ index += line_inc; \
+ current_x = 0; \
+ }
+
static void inline xan_wc3_output_pixel_run(XanContext *s,
unsigned char *pixel_buffer, int x, int y, int pixel_count)
{
int index;
int current_x;
int width = s->avctx->width;
- unsigned char pixel;
+ unsigned char pix;
+ 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++;
+
+ ADVANCE_CURRENT_X();
+ }
+ 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++];
+
+ ADVANCE_CURRENT_X();
+ }
+ 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--) {
+ pix = *pixel_buffer++;
+
+ rgb_plane[index++] = s->palette[pix * 4 + 0];
+ rgb_plane[index++] = s->palette[pix * 4 + 1];
+ rgb_plane[index++] = s->palette[pix * 4 + 2];
+
+ ADVANCE_CURRENT_X();
+ }
+ 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++];
+
+ ADVANCE_CURRENT_X();
+ }
+ break;
+
case PIX_FMT_YUV444P:
y_plane = s->current_frame.data[0];
u_plane = s->current_frame.data[1];
index = y * stride + x;
current_x = x;
while(pixel_count--) {
- pixel = *pixel_buffer++;
+ pix = *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];
+ y_plane[index] = s->palette[pix * 4 + 0];
+ u_plane[index] = s->palette[pix * 4 + 1];
+ v_plane[index] = s->palette[pix * 4 + 2];
index++;
- current_x++;
- if (current_x >= width) {
- /* reset accounting variables */
- index += line_inc;
- current_x = 0;
- }
+ ADVANCE_CURRENT_X();
}
break;
default:
- printf (" Xan WC3: Unhandled colorspace\n");
+ av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n");
break;
}
}
+#define ADVANCE_CURFRAME_X() \
+ curframe_x++; \
+ if (curframe_x >= width) { \
+ curframe_index += line_inc; \
+ curframe_x = 0; \
+ }
+
+#define ADVANCE_PREVFRAME_X() \
+ prevframe_x++; \
+ if (prevframe_x >= width) { \
+ prevframe_index += line_inc; \
+ prevframe_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)
{
int curframe_index, prevframe_index;
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++];
+
+ ADVANCE_CURFRAME_X();
+ ADVANCE_PREVFRAME_X();
+ }
+ 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++];
+
+ ADVANCE_CURFRAME_X();
+ ADVANCE_PREVFRAME_X();
+ }
+ 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++];
+
+ ADVANCE_CURFRAME_X();
+ ADVANCE_PREVFRAME_X();
+ }
+ 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++];
+
+ ADVANCE_CURFRAME_X();
+ ADVANCE_PREVFRAME_X();
+ }
+ break;
+
case PIX_FMT_YUV444P:
y_plane = s->current_frame.data[0];
u_plane = s->current_frame.data[1];
line_inc = stride - width;
curframe_index = y * stride + x;
curframe_x = x;
- prevframe_index = (y + motion_x) * stride + x + motion_x;
+ prevframe_index = (y + motion_y) * stride + x + motion_x;
prevframe_x = x + motion_x;
while(pixel_count--) {
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;
- }
-
+ ADVANCE_CURFRAME_X();
prevframe_index++;
- prevframe_x++;
- if (prevframe_x >= width) {
- /* reset accounting variables */
- prevframe_index += line_inc;
- prevframe_x = 0;
- }
+ ADVANCE_PREVFRAME_X();
}
break;
default:
- printf (" Xan WC3: Unhandled colorspace\n");
+ av_log(s->avctx, AV_LOG_ERROR, " Xan WC3: Unhandled colorspace\n");
break;
}
}
int motion_x, motion_y;
int x, y;
- unsigned char *method1_buffer = s->buffer1;
- unsigned char *method2_buffer = s->buffer2;
+ unsigned char *opcode_buffer = s->buffer1;
+ unsigned char *imagedata_buffer = s->buffer2;
/* pointers to segments inside the compressed chunk */
- unsigned char *method1_segment;
+ unsigned char *huffman_segment;
unsigned char *size_segment;
unsigned char *vector_segment;
- unsigned char *method2_segment;
+ unsigned char *imagedata_segment;
- method1_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]);
- method2_segment = s->buf + LE_16(&s->buf[6]);
+ 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_decode_method_1(method1_buffer, method1_segment);
- if (method2_segment[0] == 2)
- xan_decode_method_2(method2_buffer, method2_segment + 1);
+ xan_huffman_decode(opcode_buffer, huffman_segment);
+
+ if (imagedata_segment[0] == 2)
+ xan_unpack(imagedata_buffer, &imagedata_segment[1]);
else
- method2_buffer = method2_segment + 1;
+ imagedata_buffer = &imagedata_segment[1];
/* use the decoded data segments to build the frame */
x = y = 0;
while (total_pixels) {
- opcode = *method1_buffer++;
+ opcode = *opcode_buffer++;
size = 0;
switch (opcode) {
/* run of (size) pixels is unchanged from last frame */
xan_wc3_copy_pixel_run(s, x, y, size, 0, 0);
} else {
- /* output a run of pixels from method2_buffer */
- xan_wc3_output_pixel_run(s, method2_buffer, x, y, size);
- method2_buffer += size;
+ /* output a run of pixels from imagedata_buffer */
+ xan_wc3_output_pixel_run(s, imagedata_buffer, x, y, size);
+ imagedata_buffer += size;
}
} else {
/* run-based motion compensation from last frame */
}
}
}
+
+ /* 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);
+ s->current_frame.palette_has_changed = 1;
+ s->avctx->palctrl->palette_changed = 0;
+ }
}
static void xan_wc4_decode_frame(XanContext *s) {
uint8_t *buf, int buf_size)
{
XanContext *s = avctx->priv_data;
- unsigned char *palette_control = avctx->extradata;
+ AVPaletteControl *palette_control = avctx->palctrl;
int keyframe = 0;
- if (palette_control[0]) {
+ if (palette_control->palette_changed) {
/* load the new palette and reset the palette control */
- xan_wc3_build_palette(s, &palette_control[1]);
- palette_control[0] = 0;
+ xan_wc3_build_palette(s, palette_control->palette);
+ /* If pal8 we clear flag when we copy palette */
+ if (s->avctx->pix_fmt != PIX_FMT_PAL8)
+ palette_control->palette_changed = 0;
keyframe = 1;
}
if (avctx->get_buffer(avctx, &s->current_frame)) {
- printf (" Interplay Video: get_buffer() failed\n");
+ av_log(s->avctx, AV_LOG_ERROR, " Xan Video: get_buffer() failed\n");
return -1;
}
+ s->current_frame.reference = 3;
s->buf = buf;
s->size = buf_size;
- if (avctx->codec->id == CODEC_ID_XAN_WC3) {
-// if (keyframe)
- if (1)
- xan_wc3_decode_frame(s);
- else {
- memcpy(s->current_frame.data[0], s->last_frame.data[0],
- s->current_frame.linesize[0] * avctx->height);
- memcpy(s->current_frame.data[1], s->last_frame.data[1],
- s->current_frame.linesize[1] * avctx->height);
- memcpy(s->current_frame.data[2], s->last_frame.data[2],
- s->current_frame.linesize[2] * avctx->height);
- }
- } else if (avctx->codec->id == CODEC_ID_XAN_WC4)
+ 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);
-
+
/* release the last frame if it is allocated */
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
projects / ffmpeg / blobdiff