/**
* Parse the palette segment packet.
*
* The palette segment contains details of the palette,
* a maximum of 256 colors can be defined.
*
* @param avctx contains the current codec context
* @param buf pointer to the packet to process
* @param buf_size size of packet to process
*/
static void parse_palette_segment(AVCodecContext *avctx,
const uint8_t *buf, int buf_size)
{
PGSSubContext *ctx = avctx->priv_data;
const uint8_t *buf_end = buf + buf_size;
const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
int color_id;
int y, cb, cr, alpha;
int r, g, b, r_add, g_add, b_add;
/* Skip two null bytes */
buf += 2;
while (buf < buf_end) {
color_id = bytestream_get_byte(&buf);
y = bytestream_get_byte(&buf);
cb = bytestream_get_byte(&buf);
cr = bytestream_get_byte(&buf);
alpha = bytestream_get_byte(&buf);
YUV_TO_RGB1(cb, cr);
YUV_TO_RGB2(r, g, b, y);
av_dlog(avctx, "Color %d := (%d,%d,%d,%d)\n", color_id, r, g, b, alpha);
/* Store color in palette */
ctx->clut[color_id] = RGBA(r,g,b,alpha);
}
}
void yuv420_to_rgb555(int width, int height,
const uchar* pY, int yLine,
const uchar* pU, int uLine,
const uchar* pV, int vLine,
uchar* rgb, int rgbLine)
{
if (!s_bCropTblInit) {
int i;
for (i=0;i<MAX_NEG_CROP;++i) {
cropTbl[i] = 0;
cropTbl[i+MAX_NEG_CROP+256] = 255;
}
for (i=0;i<256;++i)
cropTbl[i+MAX_NEG_CROP] = i;
s_bCropTblInit = true;
}
int w, y, cb, cr, r_add, g_add, b_add;
uchar* cm = cropTbl + MAX_NEG_CROP;
unsigned int r, g, b;
int dx = 2;
int dy = rgbLine;
uchar* d = rgb;
const uchar* y1_ptr = pY;
const uchar* cb_ptr = pU;
const uchar* cr_ptr = pV;
int width2 = (width + 1) >> 1;
for(;height >= 2; height -= 2) {
uchar* d1 = d;
uchar* d2 = d + dy;
const uchar* y2_ptr = y1_ptr + yLine;
for(w = width; w >= 2; w -= 2) {
YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);
/* output 4 pixels */
YUV_TO_RGB2(r, g, b, y1_ptr[0]);
RGB_OUT_555(d1, r, g, b);
YUV_TO_RGB2(r, g, b, y1_ptr[1]);
RGB_OUT_555(d1 + dx, r, g, b);
YUV_TO_RGB2(r, g, b, y2_ptr[0]);
RGB_OUT_555(d2, r, g, b);
YUV_TO_RGB2(r, g, b, y2_ptr[1]);
RGB_OUT_555(d2 + dx, r, g, b);
d1 += dx+dx;
d2 += dx+dx;
y1_ptr += 2;
y2_ptr += 2;
cb_ptr++;
cr_ptr++;
}
// handle odd width
if (w) {
YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);
YUV_TO_RGB2(r, g, b, y1_ptr[0]);
RGB_OUT_555(d1, r, g, b);
YUV_TO_RGB2(r, g, b, y2_ptr[0]);
RGB_OUT_555(d2, r, g, b);
d1 += dx;
d2 += dx;
y1_ptr++;
y2_ptr++;
cb_ptr++;
cr_ptr++;
}
d += dy + dy;
y1_ptr += 2 * yLine - width;
cb_ptr += uLine - width2;
cr_ptr += vLine - width2;
}
/* handle odd height */
if (height) {
uchar* d1 = d;
for(w = width; w >= 2; w -= 2) {
YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);
/* output 2 pixels */
YUV_TO_RGB2(r, g, b, y1_ptr[0]);
RGB_OUT_555(d1, r, g, b);
YUV_TO_RGB2(r, g, b, y1_ptr[1]);
RGB_OUT_555(d1 + dx, r, g, b);
d1 += dx+dx;
y1_ptr += 2;
cb_ptr++;
cr_ptr++;
}
/* handle width */
if (w) {
YUV_TO_RGB1(cb_ptr[0], cr_ptr[0]);
/* output 2 pixels */
YUV_TO_RGB2(r, g, b, y1_ptr[0]);
RGB_OUT_555(d1, r, g, b);
d1 += dx;
y1_ptr++;
cb_ptr++;
cr_ptr++;
}
}
}