static int decode_i2_frame(FourXContext *f, const uint8_t *buf, int length){ int x, y, x2, y2; const int width= f->avctx->width; const int height= f->avctx->height; uint16_t *dst= (uint16_t*)f->current_picture.data[0]; const int stride= f->current_picture.linesize[0]>>1; for(y=0; y<height; y+=16){ for(x=0; x<width; x+=16){ unsigned int color[4], bits; memset(color, 0, sizeof(color)); //warning following is purely guessed ... color[0]= bytestream_get_le16(&buf); color[1]= bytestream_get_le16(&buf); if(color[0]&0x8000) av_log(NULL, AV_LOG_ERROR, "unk bit 1\n"); if(color[1]&0x8000) av_log(NULL, AV_LOG_ERROR, "unk bit 2\n"); color[2]= mix(color[0], color[1]); color[3]= mix(color[1], color[0]); bits= bytestream_get_le32(&buf); for(y2=0; y2<16; y2++){ for(x2=0; x2<16; x2++){ int index= 2*(x2>>2) + 8*(y2>>2); dst[y2*stride+x2]= color[(bits>>index)&3]; } } dst+=16; } dst += 16 * stride - x; } return 0; }